US3710376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calibration of analog-to-digital converter
Assignee: Applied Automation Inc
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Filing: 1970-06-22
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Granted: 1973-01-09
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Expires: 1990-06-22
Abstract
Abstract Analog signals are applied sequentially through a multiplexer and an analog-to-digital converter to a digital computer. The computer is programmed to check the zero point and the span of the converter periodically. Zero and reference voltages are applied to the multiplexer when these respective checks are made. Output signals from the computer are applied as feedback error signals to adjust the converter.
Inventors
- 👤 D Fluegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:46
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/1205; H03M1/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
The apparatus of claim 1 wherein said function generator further includes a variable frequency oscillator connected to the output of said function generator, the frequency of said oscillator being a function of the amplitude of an input signal applied thereto, and means to apply the output signal from said function generator to the input of said oscillator.
Claim 2
Dependent Claim
30 words
The apparatus of claim 1 wherein said variable frequency oscillator has voltage variable capacitors connected therein so that the output signal from said function generator is applied to said capacitors.
References Cited (Backward Citations)
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US3506810A
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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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |