US4951052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Correction of systematic error in an oversampled analog-to-digital converter
Assignee: General Electric Co
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Filing: 1989-07-10
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Granted: 1990-08-21
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Expires: 2009-07-10
Abstract
Abstract A method for performing oversampled analog-to-digital conversion of an input signal to generate a conversion result signal essentially free of systematic errors in accordance with the invention includes the steps of: performing oversampled analog-to-digital conversion of the input signal to generate a preliminary conversion result signal accompanied by systematic error, performing oversampled analog-to-digital conversion of a zero-valued signal to generate a correction signal essentially consisting of a corresponding systematic error, and differentially combining the correction signal and the preliminary conversion result signal to generate the conversion result essentially free of systematic errors. In a structural embodiment of the invention the systematic error in an oversampled analog-to-digital converter is suppressed by subtracting from the conversion response the response of a similar oversampled analog-to-digital converter to the reference voltage as its analog input signal.
Inventors
- 👤 Philippe L. Jacob
- 👤 Steven L. Gaverick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:13
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/30; H03M3/322; H03M3/324; H04; H04B; H04B14/00; H04B14/02; H04B14/06; H04B14/062; H03M3/39; H03M3/412; H03M3/422; H03M3/43; H03M3/436; H03M3/456
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
In combination: first and second oversampling analog-to-digital converters of signed, single-ended, delta-sigma type, which are similar to each other in respective operating characteristics, have respective input ports each having a respective reference terminal and a respective input terminal, and have respective output ports; means for applying between the reference and input terminals of said first analog-to-digital converter an input signal to be digitized; means for applying a reference voltage to the reference terminals of said first and second analog-to-digital converters and to the input terminal of said second analog-to-digital converter; and a digital subtractor having input ports connecting to separate ones or output ports of said first and second analog-to-digital converters and having an output port from which digitized response to said input signal is available.
Claim 2
Dependent Claim
126 words
In combination: first and second oversampling analog-to-digital converters of signed, single-ended, delta-sigma type, which are similar to each other in respective operating characteristics, have respective input ports each having a respective reference terminal and a respective input terminal, and have respective output ports; means for applying between the reference and input terminals of said first analog-to-digital converter an input signal to be digitized; means for applying a reference voltage to the reference terminals of said first and second analog-to-digital converters and to the input terminal of said second analog-to-digital converter; and a digital subtractor having input ports connecting to separate ones or output ports of said first and second analog-to-digital converters and having an output port from which digitized response to said input signal is available.
Claim 3
Independent Claim
91 words
A method for performing oversampled analog-to-digital conversion of an input signal to generate a conversion result signal essentially free of systematic errors, said method comprising the steps of: performing oversampled analog-to-digital conversion of said input signal having a systematic error signal to generate a preliminary conversion result, performing oversampled analog-to-digital conversion of a zero-valued signal to generate a correction signal essentially consisting of a corresponding systematic error, and differentially combining digitally said correction signal and said preliminary conversion result signal to generate said conversion result signal essentially free of systematic errors.
Claim 4
Independent Claim
91 words
A method for performing oversampled analog-to-digital conversion of an input signal to generate a conversion result signal essentially free of systematic errors, said method comprising the steps of: performing oversampled analog-to-digital conversion of said input signal having a systematic error signal to generate a preliminary conversion result, performing oversampled analog-to-digital conversion of a zero-valued signal to generate a correction signal essentially consisting of a corresponding systematic error, and differentially combining digitally said correction signal and said preliminary conversion result signal to generate said conversion result signal essentially free of systematic errors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |