Patent US3879724A successfully refreshed from Google Patents.
US3879724A
Expired / Lapsed
US
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Integrating analog to digital converter
Assignee: VIDAR CORP
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Filing: 1973-11-19
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Granted: 1975-04-22
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Expires: 1993-11-19
Abstract
Abstract An integrating analog to digital converter which utilizes a successive approximation analog to digital converter and integrates by adding a predetermined number of approximations and averages the sum.
Inventors
- 👤 John C Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:43
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/34; H03M1/38; H03M1/40; H03M1/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
82 words
An integrating analog to digital converter comprising: successive approximation analog to digital (A/D) converting means to provide a substantially instantaneous digital output signal indicative of the amplitude of an analog input signal; means coupled to said A/D converting means for initiating consecutive A/D conversions; means for adding the digital outputs of a predetermined number of said consecutive conversions; means for dividing the sum of said additions by said predetermined number to provide an integrated digital output representative of said analog input signal.
Claim 2
Dependent Claim
82 words
An integrating analog to digital converter comprising: successive approximation analog to digital (A/D) converting means to provide a substantially instantaneous digital output signal indicative of the amplitude of an analog input signal; means coupled to said A/D converting means for initiating consecutive A/D conversions; means for adding the digital outputs of a predetermined number of said consecutive conversions; means for dividing the sum of said additions by said predetermined number to provide an integrated digital output representative of said analog input signal.
Claim 3
Dependent Claim
82 words
An integrating analog to digital converter comprising: successive approximation analog to digital (A/D) converting means to provide a substantially instantaneous digital output signal indicative of the amplitude of an analog input signal; means coupled to said A/D converting means for initiating consecutive A/D conversions; means for adding the digital outputs of a predetermined number of said consecutive conversions; means for dividing the sum of said additions by said predetermined number to provide an integrated digital output representative of said analog input signal.
Claim 4
Dependent Claim
82 words
An integrating analog to digital converter comprising: successive approximation analog to digital (A/D) converting means to provide a substantially instantaneous digital output signal indicative of the amplitude of an analog input signal; means coupled to said A/D converting means for initiating consecutive A/D conversions; means for adding the digital outputs of a predetermined number of said consecutive conversions; means for dividing the sum of said additions by said predetermined number to provide an integrated digital output representative of said analog input signal.
Claim 5
Dependent Claim
55 words
An integrating analog to digital converter as in claim 1 where said number of conversions is Bm where B is the radix of the number system being used for the digital output and m is an integer where said means for dividing is responsive to m to divide by moving a base point m times.
Claim 6
Dependent Claim
18 words
An integrating analog to digital converter as in claim 1 together with means for making said conversions cyclically.
Claim 7
Dependent Claim
30 words
An integrating analog to digital converter as in claim 1 together with transformer means for coupling said A/D converting means to said adding means whereby common mode rejection is provided.
Claim 8
Dependent Claim
16 words
An integrating analog to digital converter as in claim 4 where said A/D means is shielded.
Claim 9
Dependent Claim
21 words
An integrating analog to digital converter as in claim 1 where after division the least significant bit is retained as valid.
Claim 10
Dependent Claim
22 words
An integrating analog to digital converter as in claim 6 including means for modulating said analog input signal with a periodic signal.
Claim 11
Dependent Claim
31 words
An integrating analog to digital converter as in claim 1 together with offset amplifier means responsive to bipolar analog input signals to provide a unipolar input to said A/D converting means.
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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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |