US3623076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for testing a-to-d converters
Assignee: AMF GEO SPACE Corp A CORP OF TEXAS
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Filing: 1969-09-11
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Granted: 1971-11-23
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Expires: 1989-09-11
Abstract
Abstract A method and apparatus for testing an A-to-D converter by applying to the A-to-D converter a DC test signal whose amplitude is varied and which is modulated by an AC signal. The output digital data from the A-to-D converter is applied to a D-to-A converter and then displayed for monitoring the distortions of the A-to-D converter.
Inventors
- 👤 Jerrell F Moffitt
- 👤 Algernon S Badger
- 👤 Paul I Madeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:59
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/14; H03; H03M; H03M1/00; H03M1/10; H03M1/1071
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
A method of testing an A-to-D converter comprising the steps of: applying at least one input analog test signal to the A-to-D converter under test for converting said analog signal to a digital signal, said analog test signal having a DC component and an AC component, said DC component having an amplitude corresponding to a level in said A-to-D converter at which a discontinuity occurs; applying said digital signal to a D-to-A converter for converting said digital signal to a reconverted analog signal, and eliminating said DC component from the reconverted analog signal; and monitoring the AC component of said reconverted analog signal to obtain an indication of the operation of said A-to-D converter.
Claim 2
Independent Claim
114 words
A method of testing an A-to-D converter comprising the steps of: applying at least one input analog test signal to the A-to-D converter under test for converting said analog signal to a digital signal, said analog test signal having a DC component and an AC component, said DC component having an amplitude corresponding to a level in said A-to-D converter at which a discontinuity occurs; applying said digital signal to a D-to-A converter for converting said digital signal to a reconverted analog signal, and eliminating said DC component from the reconverted analog signal; and monitoring the AC component of said reconverted analog signal to obtain an indication of the operation of said A-to-D converter.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein said DC component in said reconverted analog signal is eliminated by amplifying said digital signal prior to applying said digital signal to said D-to-A converter.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein, said monitoring step includes the step of visually displaying said AC component.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein said DC component in said reconverted analog signal is eliminated by shifting said digital signal prior to applying said digital signal to said D-to-A converter.
Claim 6
Independent Claim
112 words
A system for testing an A-to-D converter comprising: energy means for applying at least one input analog test signal to the A-to-D converter under test for converting said analog signal to a digital signal, said analog test signal having a DC component and an AC component, said DC component having an amplitude corresponding to a level in said A-to-D converter at which a discontinuity occurs; means including a D-to-A converter for converting said digital signal to a reconverted analog signal, and eliminating said DC component from the reconverted analog signal; and means monitoring the AC component of said reconverted analog signal to obtain an indication of the operation of said A-to-D converter.
Claim 7
Independent Claim
112 words
A system for testing an A-to-D converter comprising: energy means for applying at least one input analog test signal to the A-to-D converter under test for converting said analog signal to a digital signal, said analog test signal having a DC component and an AC component, said DC component having an amplitude corresponding to a level in said A-to-D converter at which a discontinuity occurs; means including a D-to-A converter for converting said digital signal to a reconverted analog signal, and eliminating said DC component from the reconverted analog signal; and means monitoring the AC component of said reconverted analog signal to obtain an indication of the operation of said A-to-D converter.
Claim 8
Dependent Claim
30 words
The system of claim 6 and further including, amplifying means for amplifying said digital signal prior to applying said digital signal to said D-to-A converter, thereby eliminating said DC component.
Claim 9
Dependent Claim
35 words
The system of claim 6 wherein said energy means includes: a variable DC source; an AC source; and means for combining the DC output of said DC source with the output of said AC source.
Claim 10
Dependent Claim
32 words
The system of claim 6 and further including, data bit shifting means for sHifting said digital signal prior to applying said digital signal to said D-to-A converter, thereby eliminating said DC component.
Claim 11
Dependent Claim
18 words
The system of claim 6 wherein, said monitoring means provides a visual display of said reconverted analog signal.
References Cited (Backward Citations)
US3314015A
Cited
US3427444A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |