908860iiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
`
` .‘ 'xpress Mailing Label No. EM 211516997 US
`
`09/23/2008
`PTO/SB/OS (08-08)
`.
`'heck No. 29528
`Approved for use through 06/30/2010. OMB 0651-0032
`
`
`U.S. Patent and Trademark Office. U.S. DEPARTMENT OF COMMERCE
`a valid OMB control number.
`wired to res-0nd to a collection of intormation unless it disda
`Under the Pa-erwork Reduction Act of 1995 no ersons are re
`
`
`
`
`U11erv
`
`Attomey Docket No.
`
`A56N3237US
`
`PATENT APPLICATION
`
`
`
`
`TRANSM'TTAL
`
`
`
`
`(Only for new nonprovisional applications under 37 CFR 1.53(b))
`
`
`
`Express Mail Label No.
`
`APPLICAT|°N ELEMENTS
`See MPEP chapter 600 conceming utility patent application contents.
`
`ADDRESS TO:
`
`EM 211516997 US
`Commissioner for Patents
`Po. Box 1450
`Alexandria VA 22313-1450
`
`
`
`
`
`U.S. PTO
`12/284672
`
`i.
`
`6. [3 Application Data Sheet. See 37 CFR 1.76
`|
`.
`t
`7. [:1 CD-ROM or CD-R In duplIcate. large table or
`Cflputer Program (Appendix)
`Landscape Table on CD
`8, Nucleotide and/or Amino Acid Sequence Submission
`(if ap licable, items a, — c. are required)
`a.
`Computer Readable Form (CRF)
`b.
`Specification Sequence Listing on:
`
`STEVEN C. PATRICK
`
`1-
`2|
`
`Fee Transmittal Form <e~9-- PTO/SEW)
`A licant I'
`lie t'
`[at
`.
`
`- 5:: 37 CF‘EaJngéma
`"S
`n Ity S
`v
`3.. Specification
`[Total Pages
`25
`Both the claims and abstract must start on a new page
`(For information an the matched an'angemeni, see MPEP 608.01(a))
`4,. Drawing(s) (35 U.S.C. 113)
`[Total Sheets
`11
`5. Oath or Declaration
`[Total Sheets
`a.
`Newly executed (original or copy)
`b.
`A copy from a prior application (37 CFR 1.63(d))
`for continuation/divisional with Box 18 completed)
`DELETION OF INVENTOR(S)
`name In
`e prior app Ica Ion, see
`Signeq statement analghetgi deletingng'errgorls}
`1t)63(d)(2)and 1.33(b).
`
`ACCOMPANYING APPLICATION PARTS
`
`9. [:1 Assignment Papers (cover sheet & document(s))
`Name of Assignee
`
`10. |:| 37 CFR 3.73m Statement
`(when there is an assignee)
`
`[:lPower of
`Attorney
`
`11. D English Translation Document (if applicable)
`
`12.
`
`,
`.
`.
`.
`Info'tion Disclosure Statement (PTO/SBI08 or PTO-1449)
`Copies of crtatrons attached
`
`13 '3 Preliminary Amendment
`14.
`Return Receipt Postcard (MPEP 503)
`(Should be specifically itemized)
`_
`_
`_
`g
`_
`_
`15. [:1 Certified Copy of Priority Document(s)
`(If fOTEIQn pnonty IS Claimed)
`.
`.
`,
`.
`16. C] Nonpubltcation Request under 35 U.S.C. 122(b)(2)(B)(I).
`Applicant must attach form PTO/SB/35 or equivalent
`
`i. C]
`--
`II. I:]
`
`CD-ROM orCD-R Zoo ies;or
`(
`p
`)
`Paper
`
`17.
`
`Other; Unsigned Declaration (4 pages)
`
`c. D Statements verifying identity of above copies
`18. If a CONTINUING APPLICATION. check appropriate box, and supply the requisite information below and in the first sentence of the
`specification following the title, or in an Application Data Sheet under 37 CFR 1. 76:
`
`[:1 Continuation
`Pn'or application information:
`
`D Divisional
`Examiner
`
`[:1 Continuation-In-part (CIP)
`
`of prior application No.:
`Art Unit:
`
`19. CORRESPONDENCE ADDRESS
`
`The address associated with Customer Number
`
`OR E] Correspondence address below
`
`
`
`'
`
`i
`
`Registration No.
`Attorne IA-ent 40'3“
`
`This collection of information is required by 37 CFR 1.53(b). The information is required to obtain or retain a benefit by the public which is to file (and by the
`USPTO to process) an application. Confidentiality is governed by 35 U.S.C. 122 and 37 CFR 1.11 and 1.14. This collection is estimated to take 12 minutes to
`complete, including gathering, preparing. and submitting the completed application form to the USPTO. Time will vary depending upon the individual case. Any
`comments on the amount of time you require to complete this form and/or suggestions for reducing this burden. should be sent to the Chief Information Officer.
`U.S. Patent and Trademark Office. U.S. Department of Commerce, PO. Box 1450, Alexandria, VA 22313-1450. DO NOT SEND FEES OR COMPLETED
`FORMS TO THIS ADDRESS. SEND TO: Commissioner for Patents. P.0. Box 1450. Alexandria, VA 22313-1450.
`I! you need assistance in completing the form, call 1-800-PTO-9199 and select option 2.
`
`Xilinx Exhibit 1003
`
`Page 1
`
`

`

`Express Mailing Label No. EM 211516997 US
`PTO/SBI17 (10—07)
`Check No. 29528
`Approved for use through 06/30/2010. 0MB 0651-0032
`US. Patent and Trademark Office: US. DEPARTMENT OF COMMERCE
`Under the Paerwork Reduction Act of 1995 no - .
`rsons are re- uired to res- and to a collection of information unless it diSoIa s a valid OMB control number
`
`
`Effective on 12/08/2004.
`Fees pursuant to the Consolidated Appropriations Act, 2005 (HR. 4818).
`FEE TRANSMITTAL
`For FY 2008
`
`
`
`
`
`
`
`
`
`
`
`
`Complete if Known
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`First Named Inventor
`——
`_—
`A5GN3237US
`
`U Applicant claims small entity status. See 37 CFR 1.27
`
`TOTAL AMOUNT OF PAYMENT
`
`($)
`
`
`
`1,030.00
`
`
`
`METHOD OF PAYMENT (check all that apply)
`
`Check El Credit Card El Money Order El None D Other (please identify):
`.Deposit Account
`061305“ AccountNumber:_‘]_];1_5_8_O____ Deposit Account Name: STEVEN C. PATRICK
`For the above-identified deposit account, the Director is hereby authorized to: (check all that apply)
`DCharge fee(s) indicated below
`D Charge fee(s) indicated below, except for the filing fee
`Charge any additional fee(s) or underpayments of fee(s)
`0’ Credit an o e
`nts
`under 37 CFR 1.16 and 1.17
`V V mayme
`WARNING: lnforrnation on this form may become public. Credit card information should not be included on this form. Provide credit card
`lnforrnation and authorization on PTO-2038.
`
`FEE CALCULATION
`
`1. BASIC FILING, SEARCH, AND EXAMINATION FEES
`FILINGSFEEHSE u
`SEARCH FEES
`ma
`n I
`S
`II E fig
`Fee (fl TeT-fi‘fl
`Fee (g)
`"I?” fin)
`310
`155
`510
`255
`210
`105
`100
`50
`
`Application Type
`Utility
`Design
`
`210
`310
`2l0
`
`105
`155
`105
`
`310
`510
`0
`
`155
`255
`0
`
`Plant
`Reissue
`Provisional
`2. EXCESS CLAIM FEES
`Fee Description
`Each claim over 20 (including Reissues)
`Each independent claim over 3 (including Reissues)
`Multiple dependent claims
`Fee (fl
`Total Claims
`Extra Claims
`59
`x
`21)
`- 20 or HP =
`Q
`HP = highest number of total claims paid for, if greater than 20.
`Fee Paid (g)
`lndep. Claims
`Extra Claims
`Fee l§l
`= __Q_.
`X
`2
`-30rHP=
`(I
`ZIQ
`HP = highest number of independent claims paid for, ifgreater than 3.
`
`Fee Paid (fl
`5)
`
`=
`
`Fees Paid (fl
`$1 039 99
`
`EXAMINATION FEES
`3
`II E t‘g
`Fee (5) mFZe (5T
`210
`105
`I30
`65
`
`160
`620
`0
`
`80
`310
`0
`
`Small Entig
`Fee (fl
`$5)
`25
`50
`105
`210
`185
`370
`Multiple Dependent Claims
`Fee (fl
`Fee Paid (fi)
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`.
`3. APPLICATION SIZE FEE _
`If the spectfication and drawmgs exceed 100 sheets of paper (excluding electronically filed sequence or computer
`listings under 37 CFR 1.52(e)), the application size fee due is $260 ($130 for small entity) for each additional 50
`
`sheets or fraction thereof. See 35 U.S.C. 41%)(1)(G) and 37 CFR l.l6(s).
`Total Sheets
`Extra Sheets
`Num er of each additional 50 or raction thereof
`- 100 =
`/50 =
`(round up to a whole number)
`x
`
`Fee (g)
`
`
`
`
`
`
`
`
`Fee Paid l§l
`
`
`
`
`
`
`4. OTHER FEE(S)
`$130 fee (no small entity discount)
`Non-English Specification,
`
`
`Other (e.g., late filing surcharge):
`
`
`
`I
`Registration No.
`w-lmm .....,....
`
`
`Name (Print/Type) STEVEN C. PATRICK
`
`Fees Paid m
`
`40.341
`
`Te'evh°ne<sos>ava-ooso
`Date September 23, 2008
`
`
`
`This collection of information is required by 37 CFR 1.136. The information is required to obtain or retain a benefit by the public which is to tile (and by the
`USPTO to process) an application. Confidentiality is governed by 35 U.S.C. 122 and 37 CFR 1.14. This collection is estimated to take 30 minutes to complete,
`including gathering, preparing, and submitting the completed application form to the USPTO. Time will vary depending upon the individual case. Any comments
`on the amount of time you require to complete this form and/or suggestions for reducing this burden, should be sent to the Chief information Officer, US. Patent
`and Trademark Office, US. Department oi Commerce, PO. Box 1450. Alexandria, VA 22313-1450. DO NOT SEND FEES OR COMPLETED FORMS TO THIS
`ADDRESS. SEND TO: Commissioner for Patents, PO. Box 1450, Alexandria, VA 22313-1450.
`If you need assistance in completing the form, call 1-800—PTO-9199 and select option 2.
`
`Page 2
`
`

`

`
`
`
`
`_—
`
`D Applicant claims small entity status. See 37 CFR 1.27
`
`TOTAL AMOUNT OF PAYMENT
`
`($)
`
`1,030.00
`
`Art Unit
`
`METHOD or PAYMENT (check all that apply)
`
`
`
`
`
`D Charge fee(s) indicated below. except for the filing fee
`DCharge fee(s) indicated beI°W
`Charge any additional fee(s) or underpayments of fee(s) y C d't
`t
`under 37 CFR 1.16 and 1.17
`re I any overpaymen s
`WARNING: Intonnatlon on this form may become public. Credit card Information should not be included on this form. Provide credit card
`Information and authorization on PTO-2038.
`
`FEE CALCULATION
`
`Application Type
`Utility
`Design
`Plant
`Reissue
`
`210
`
`105
`
`Provisional
`2. EXCESS CLAIM FEES
`Fee Description
`Each claim over 20 (including Reissues)
`Each independent claim over 3 (including Reissues)
`Multiple dependent claims
`Fee (£1
`Total Claims
`Extra Claims
`59
`x
`29
`- 20 or HP =
`Q
`HP = highest number of total claims paid for, if greater than 20.
`lndeg. Claims
`Extra Claims
`Fee (fl
`=
`X
`2
`-30rHP =
`1)
`2:”)
`HP = highest number of independent claims paid for. if greater than 3.
`
`Fees Paid (fi)
`$1 QQQ 90
`
`‘
`
`0
`
`0
`
`0
`
`0
`
`mm
`£e_e_(§)
`Fifi!
`25
`50
`105
`210
`185
`370
`Multiple Dependent Claims
`Fee (g)
`Fee Paid l§l
`
`Fee Paid l§l
`(2
`
`=
`
`Fee Paid (fl
`Q
`
`Express Mailing Label No. ElVI 211516997 US
`PTO/$8117 (1007)
`Approved for use through 06/30/2010. OMB 0651 —0032
`Check No. 29528
`US. Patent and Trademark Office: US DEPARTMENT OF COMMERCE
`Under the Pa-erwork Reduction Act of 1995 no -ersons are re
`uired to res -nd to a collection of information unless it dis-Ia
`a valid OMB control number
`
`Effective on 12/08/2004.
`
`Complete if Known
`
`
`
`
`Fees pursuant to the Consolidated Appropriations Act, 2005 (H. R. 4818).
`
`Application Number
`—
`
`
`FEE TRANSMITTAL —
`Filing Date
`
`For FY 2008
`First Named Inventor_
`
`
`
`
`
`Attorney Docket No.
`
`
`
`
`
`Check El Credit Card DMoney Order '3 None D Other (please identify):
`
`.Deposit Account Deposit AWOUNlNUMbGFIJJflL Deposit Account Name: STEVEN C. PATRICK
`For the above-identified deposit account, the Director is hereby authorized to: (check all that apply)
`
`
`
`
`
`
`
`
`
`
`
`1. BASIC FILING, SEARCH, AND EXAMINATION FEES
`
`
`
`SEARCH FEES
`EXAMINATION FEES
`FILINGSFEEHSE u
`S
`II E ti
`S
`II E t'
`ma
`n y
`Fee (fl
`Fee (fl
`Fee (g) %—u(5
`
`Fee (fl Erie—J!(5'
`
`
`
`
`310
`155
`510
`255
`210
`105
`210
`105
`100
`50
`130
`65
`
`
`210
`105
`310
`155
`160
`80
`310
`155
`5 [0
`255
`» 620
`310
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`.
`.
`3. APPLICATION SIZE FEE
`If the specrfication and drawings exceed 100 sheets of paper (excluding electronically filed sequence or computer
`listings under 37 CFR 1.52(e)), the application size fee due is $260 ($130 for small entity) for each additional 50
`sheets or fi'action thereof. See 35 U.S.C. 41(21)(1)(G) and 37 CFR l.l6(s).
`Total Sheets
`Extra Sheets
`Num er of each additional 50 or raction thereof
`— 100 =
`/50 =
`(round up to a whole number)
`x
`
`Fee (§)
`
`=
`
`Fee Paid (fl
`
`Fees paid (it
`
`
`
`
`
`
`
`
`
`
`4. OTHER FEE(S)
`Non-English Specification,
`$130 fee (no small entity discount)
`
`
` Other (e.g., late filing surcharge):
`
`I
` SUBMITTED BY
`,
`.
`.
`I
`Re istration No.
`
`
`
`Name (Print/Type) STEVEN c. PATRICK
`
`This collection of information is required by 37 CFR 1.136. The information is required to obtain or retain a benefit by the public which is to file (and by the
`USPTO to process) an application. Confidentiality is governed by 35 U.S.C. 122 and 37 CFR 1.14. This collection is estimated to take 30 minutes to complete,
`including gathering. preparing, and submitting the completed application form to the USPTO. Time will vary depending upon the individual case. Any comments
`on the amount of time you require to complete this form and/or suggestions for reducing this burden. should be sent to the Chief Information Officer. U.S. Patent
`and Trademark Office. US. Department of Commerce. PO. Box 1450. Alexandria. VA 22313-1450. DO NOT SEND FEES 0R COMPLETED FORMS TO THIS
`ADDRESS. SEND TO: Commissioner for Patents. P.O. Box 1450, Alexandria, VA 22313-1450.
`If you need assistance in completing the form, call 1-800~PTO-9199 and select option 2.
`
`Date September 23. 2008
`
`
`
`Page 3
`
`

`

`908860iiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
`
` .‘ 'xpress Mailing Label No. EM 211516997 US
`
`09/23/2008
`PTO/SB/OS (08-08)
`.
`'heck No. 29528
`Approved for use through 06/30/2010. OMB 0651-0032
`
`
`U.S. Patent and Trademark Office. U.S. DEPARTMENT OF COMMERCE
`a valid OMB control number.
`wired to res-0nd to a collection of intormation unless it disda
`Under the Pa-erwork Reduction Act of 1995 no ersons are re
`
`
`
`
`U11erv
`
`Attomey Docket No.
`
`A56N3237US
`
`PATENT APPLICATION
`
`
`
`
`TRANSM'TTAL
`
`
`
`
`(Only for new nonprovisional applications under 37 CFR 1.53(b))
`
`
`
`Express Mail Label No.
`
`APPLICAT|°N ELEMENTS
`See MPEP chapter 600 conceming utility patent application contents.
`
`ADDRESS TO:
`
`EM 211516997 US
`Commissioner for Patents
`Po. Box 1450
`Alexandria VA 22313-1450
`
`
`
`
`
`U.S. PTO
`12/284672
`
`i.
`
`6. [3 Application Data Sheet. See 37 CFR 1.76
`|
`.
`t
`7. [:1 CD-ROM or CD-R In duplIcate. large table or
`Cflputer Program (Appendix)
`Landscape Table on CD
`8, Nucleotide and/or Amino Acid Sequence Submission
`(if ap licable, items a, — c. are required)
`a.
`Computer Readable Form (CRF)
`b.
`Specification Sequence Listing on:
`
`STEVEN C. PATRICK
`
`1-
`2|
`
`Fee Transmittal Form <e~9-- PTO/SEW)
`A licant I'
`lie t'
`[at
`.
`
`- 5:: 37 CF‘EaJngéma
`"S
`n Ity S
`v
`3.. Specification
`[Total Pages
`25
`Both the claims and abstract must start on a new page
`(For information an the matched an'angemeni, see MPEP 608.01(a))
`4,. Drawing(s) (35 U.S.C. 113)
`[Total Sheets
`11
`5. Oath or Declaration
`[Total Sheets
`a.
`Newly executed (original or copy)
`b.
`A copy from a prior application (37 CFR 1.63(d))
`for continuation/divisional with Box 18 completed)
`DELETION OF INVENTOR(S)
`name In
`e prior app Ica Ion, see
`Signeq statement analghetgi deletingng'errgorls}
`1t)63(d)(2)and 1.33(b).
`
`ACCOMPANYING APPLICATION PARTS
`
`9. [:1 Assignment Papers (cover sheet & document(s))
`Name of Assignee
`
`10. |:| 37 CFR 3.73m Statement
`(when there is an assignee)
`
`[:lPower of
`Attorney
`
`11. D English Translation Document (if applicable)
`
`12.
`
`,
`.
`.
`.
`Info'tion Disclosure Statement (PTO/SBI08 or PTO-1449)
`Copies of crtatrons attached
`
`13 '3 Preliminary Amendment
`14.
`Return Receipt Postcard (MPEP 503)
`(Should be specifically itemized)
`_
`_
`_
`g
`_
`_
`15. [:1 Certified Copy of Priority Document(s)
`(If fOTEIQn pnonty IS Claimed)
`.
`.
`,
`.
`16. C] Nonpubltcation Request under 35 U.S.C. 122(b)(2)(B)(I).
`Applicant must attach form PTO/SB/35 or equivalent
`
`i. C]
`--
`II. I:]
`
`CD-ROM orCD-R Zoo ies;or
`(
`p
`)
`Paper
`
`17.
`
`Other; Unsigned Declaration (4 pages)
`
`c. D Statements verifying identity of above copies
`18. If a CONTINUING APPLICATION. check appropriate box, and supply the requisite information below and in the first sentence of the
`specification following the title, or in an Application Data Sheet under 37 CFR 1. 76:
`
`[:1 Continuation
`Pn'or application information:
`
`D Divisional
`Examiner
`
`[:1 Continuation-In-part (CIP)
`
`of prior application No.:
`Art Unit:
`
`19. CORRESPONDENCE ADDRESS
`
`The address associated with Customer Number
`
`OR E] Correspondence address below
`
`
`
`'
`
`i
`
`Registration No.
`Attorne IA-ent 40'3“
`
`This collection of information is required by 37 CFR 1.53(b). The information is required to obtain or retain a benefit by the public which is to file (and by the
`USPTO to process) an application. Confidentiality is governed by 35 U.S.C. 122 and 37 CFR 1.11 and 1.14. This collection is estimated to take 12 minutes to
`complete, including gathering, preparing. and submitting the completed application form to the USPTO. Time will vary depending upon the individual case. Any
`comments on the amount of time you require to complete this form and/or suggestions for reducing this burden. should be sent to the Chief Information Officer.
`U.S. Patent and Trademark Office. U.S. Department of Commerce, PO. Box 1450, Alexandria, VA 22313-1450. DO NOT SEND FEES OR COMPLETED
`FORMS TO THIS ADDRESS. SEND TO: Commissioner for Patents. P.0. Box 1450. Alexandria, VA 22313-1450.
`I! you need assistance in completing the form, call 1-800-PTO-9199 and select option 2.
`
`Page 4
`
`

`

`Express Mailing Label No. EM 211516997 US
`PTO/SBI17 (10—07)
`Check No. 29528
`Approved for use through 06/30/2010. 0MB 0651-0032
`US. Patent and Trademark Office: US. DEPARTMENT OF COMMERCE
`Under the Paerwork Reduction Act of 1995 no - .
`rsons are re- uired to res- and to a collection of information unless it diSoIa s a valid OMB control number
`
`
`Effective on 12/08/2004.
`Fees pursuant to the Consolidated Appropriations Act, 2005 (HR. 4818).
`FEE TRANSMITTAL
`For FY 2008
`
`
`
`
`
`
`
`
`
`
`
`
`Complete if Known
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`First Named Inventor
`——
`_—
`A5GN3237US
`
`U Applicant claims small entity status. See 37 CFR 1.27
`
`TOTAL AMOUNT OF PAYMENT
`
`($)
`
`
`
`1,030.00
`
`
`
`METHOD OF PAYMENT (check all that apply)
`
`Check El Credit Card El Money Order El None D Other (please identify):
`.Deposit Account
`061305“ AccountNumber:_‘]_];1_5_8_O____ Deposit Account Name: STEVEN C. PATRICK
`For the above-identified deposit account, the Director is hereby authorized to: (check all that apply)
`DCharge fee(s) indicated below
`D Charge fee(s) indicated below, except for the filing fee
`Charge any additional fee(s) or underpayments of fee(s)
`0’ Credit an o e
`nts
`under 37 CFR 1.16 and 1.17
`V V mayme
`WARNING: lnforrnation on this form may become public. Credit card information should not be included on this form. Provide credit card
`lnforrnation and authorization on PTO-2038.
`
`FEE CALCULATION
`
`1. BASIC FILING, SEARCH, AND EXAMINATION FEES
`FILINGSFEEHSE u
`SEARCH FEES
`ma
`n I
`S
`II E fig
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`Page 6
`
`

`

`'7‘
`
`L\
`
`APPLICATION
`
`of
`
`SCOTT GREGORY BARDSLEY
`
`BRYAN SCOTT PUCKETT
`
`MICHAEL RAY ELLIOTT
`
`RAVI KISHORE KUMMARAGUNTLA
`
`AHMED MOHAMED ABDELATTY ALI
`
`CARROLL CLIFTON SPEIR
`and
`
`JAMES CARROLL CAMP
`
`for
`
`UNITED STATES LETTERS PATENT
`
`on
`
`PIPELINED CONVERTER SYSTEMS
`
`WITH ENHANCED LINEARITY
`
`DOCKET NO. A5GN3237US
`
`ASSIGNED TO
`
`ANALOG DEVICES, INC.
`
`Page 7
`
`

`

`i 4,
`
`n
`
`PIPELINED CONVERTER SYSTEMS
`
`WITH ENHANCED LINEARITY
`
`BACKGROUND OF THE INVENTION
`
`Field of the Invention
`
`[0001]
`
`The present disclosure relates generally to pipelined signal converters.
`
`Description of the Related Art
`
`[0002]
`
`Pipelined analog—to-digital signal converter systems are often used in
`
`high-speed, high-resolution conversion applications. These systems generally
`realize a desired number of conversion bits with a cascade (i.e., a pipeline) of lower-
`
`resolution converter stages and thus achieve high resolution at sampling speeds that
`are difficult to realize with other converter systems. Each stage of a pipelined
`system quantizes that stage’s input signal to a predetermined number of digital bits -
`and forms an analog output signal which is presented to a succeeding'stage for
`further signal processing.
`
`'
`
`The advantages of sampling speed may, however, be negated if;
`[0003]
`conversion linearity is
`insufficient. For example,
`the multistage structure of
`pipelined converter systems causes certain portions of the converter structure to be
`
`used repetitively as an analog input signal is swept over the system’s input range
`and converter nonlinearity in these portions can significantly degrade the
`conversion of low-level dynamic signals.
`
`[0004]
`
`Conversion linearity is generally characterized with a variety of linearity
`
`integral nonlinearity (INL),
`parameters such as differential nonlinearity (DNL),
`signal-to-noise ratio (SNR),
`signal-to-noise—and-dis'tOrtion ratio (SINAD), and
`spurious free dynamic range (SFDR). DNL error indicates the difference between
`an actual step width of a least-significant bit and the ideal value while INL error
`
`measures the deviation of an actual transfer fimction from a straight line. SNRI] is
`
`computed by taking the ratio of the rms signal to the rms noise wherein the noise
`includes all spectral components minus the fundamental, the first four harmonics,
`
`and the DC offset. SINAD is the ratio (in dB) ofthe signal power to the power of all
`
`Page 8
`
`

`

`spectral components minus the fundamental and the DC offset. Finally, SFDR is the
`ratio of the fundamental component to the nns value of the next-largest spurious
`component (excluding DC offset).
`
`Although a variety of linearizing techniques have been proposed for
`[0005]
`pipelined converter systems, increasing demands on these systems continue to exert
`a need for further improvements in linearity.
`
`BRIEF SUMMARY OF THE INVENTION
`
`[0006]
`
`The present disclosure is generally directed to pipelined converter
`
`systems with enhanced linearity. The drawings and the following description
`provide an enabling disclosure and the appended claims particularly point out and
`distinctly claim disclosed subject matter and equivalents thereof.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`[0007]
`
`FIG. 1 is a diagram of a pipelined converter system;
`
`[0008]
`FIG. 1;
`
`[0009]
`2;
`
`[0010]
`FIG. 1;
`
`FIG. 2 is a diagram of a signal converter embodiment in the system of
`
`FIG. 3 is a diagram of clock signals for use in the signal converter of FIG.
`
`FIG. 4 is a reference signal generator which may be used in the system of
`'
`
`FIG. ‘ 5 is a transfer-function diagram that corresponds to the signal
`[0011]
`converter of FIG. 2;
`
`FIG. 6 is a diagram of a converter system embodiment of the present
`[0012]
`disclosure;
`
`[0013]
`
`FIG. 7A illustrate transfer functions of signal-processing stages in the
`
`system of FIG. 6 and possible dither levels in these stages;
`
`[0014]
`
`FIG. 7B is similar to FIG. 7A and illustrates preferred dither levels;
`
`FIG. 7C illustrates comparator levels in a back-end stage that succeeds
`[0015]
`the stages of FIGS. 7A and 7B;
`
`FIGS. 8A and 8B are diagrams of a signal sampler embodiments for use
`[0016]
`in the system of FIG. 6;
`
`FIG. 9 is a diagram of a signal converter embodiment for use in the
`[0017]
`system of FIG. 6;
`'
`
`FIG. 10 is a diagram of another converter system embodiment; and
`[0018]
`FIG. 1 l is a diagram of a frontend signal converter embodiment for use in
`[0019]
`the system of FIG. 10.
`l
`
`Page 9
`
`

`

`DETAILED DESCRIPTION OF THE INVENTION
`
`[0020]
`
`FIGS.
`
`1-11
`
`introduce signal converter system embodiments which
`
`substantially enhance conversion linearity. Signal-processing stages of these
`embodiments may include an initial signal sampler in addition to successively—
`arranged signal converters. Typically,
`the signal sampler provides a respective
`analog output signal in the form of successive samples of a system’s analog input
`signal and all but a back—end one of the signal converters processes an analog output
`signal from a preceding one of the stages into a corresponding digital code and a
`respective analog output signal (i.e., a'gained-up residue signal). The back-end
`
`signal converter processes an analog output signal from a preceding one of the
`stages into a corresponding digital code but has no need to provide a respective
`analog output signal.
`
`[0021]
`
`In different system embodiments of the disclosure, at least a selected one
`
`of the signal-processing stages is configured to simultaneously process two.
`combined analog signals — the system’s analog input signal and an injected analog
`dither signal. The combined signal
`is thus processed down randomly-selected
`signal-processing paths of the converter system to thereby induce different
`
`magnitudes and signs of INL errors. The errors of these processing paths are
`averaged to thereby provide significant
`improvements in system linearity. This
`processing, however, provides a combined digital code in which a first portion
`
`corresponds to the analog input signal and a second portion corresponds to the
`injected analog dither signal. The final system digital code is realized by subtracting .
`out the second portion.
`'
`
`In particular, system embodiments of the present disclosure are directed
`[0022]
`to analog-to—digital converter systems such as the system 20 of FIG.
`1 which is
`
`formed with M successively-arranged signal-processing stages 22 that include a
`
`signal sampler 24 followed by M-l successive signal converters 25. Except for a'
`back—end signal converter 25B, each of the stages 22 generates a respective analog
`output signal-and passes this signal to a succeeding stage for further processing.
`[0023]
`Signal conversion begins with the signal sampler 24 which captures
`
`samples of an analog input signal from a system input port 26 at a sample rate.
`These samples form the signal sampler’s respective analog output signal which is
`passed to the successive signal converters 25. All but the back-end one of these
`
`signal converters processes an analog output signal from a preceding one of the
`stages into a corresponding digital code Cdgu and a respective analog output signal
`which is passed to the succeeding converter
`stage. The back-end signal
`converter 25B processes an analog output signal from a preceding one of the stages
`into a corresponding digital code Cdgt. but does not form a respective analog output
`signal.
`
`Page 10
`
`

`

`[0024]
`
`The system 20 includes an aligner/corrector 27 which receives and
`
`temporally aligns the digital codes Cdgu. Each sample from the signal sampler 24 is
`successively processed through the signal converters at the sample rate and, only
`after the aligner/corrector 27 has received the digital codes Cdgu from all of the
`signal converters 25, does it provide a system digital code at an output port 28 that
`corresponds to the original
`sample. The signal converters 25 are generally
`configured to provide redundant code bits and the additional conversion information
`
`in these redundant code bits is used by the aligner/corrector 27 to correct conversion
`errbrs which may occur when the analog input signal
`is near transition points
`between analog regions that correspond to adjacent digital codes.
`
`[0025] . Example arrow 29 points to an exemplary embodiment 30 of the signal
`converters 25