US3573443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital-analog reciprocal function computer-generator
Assignee: Individual
•
Filing: 1968-07-09
•
Granted: 1971-04-06
•
Expires: 1988-07-09
Abstract
Abstract A hybrid circuit which may function as a digital to analog converter is disclosed. The invention comprises a combination of digital and analog circuit components which provide an analog output which is the reciprocal of a binary input signal. The invention may also be employed as a hyperbolic function generator by delivering digital input signals in consecutive order to the circuit.
Inventors
- 👤 Harry Fein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:45
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/28; H; H03; H03M; H03M1/00; H03M1/12; H03M1/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
A hybrid function generator comprising: counter means having at least a first input terminal and a plurality of output terminals, said counter means being responsive to a numerical input signal in binary form for generating an output commensurate therewith; direct current amplifier means having an input and an output terminal; a constant current source, said current source being connected to said amplifier means input terminal; and a plurality of weighted circuits connected in parallel with said amplifier means, at least some of said weighted circuits including switch means, each one of said switch means being connected to a respective one of said counter means output terminals whereby said switch means will be responsive to the number loaded into said counter means and the voltage developed across said plurality of weighted circuits will be inversely proportional to the input signal.
Claim 2
Dependent Claim
139 words
A hybrid function generator comprising: counter means having at least a first input terminal and a plurality of output terminals, said counter means being responsive to a numerical input signal in binary form for generating an output commensurate therewith; direct current amplifier means having an input and an output terminal; a constant current source, said current source being connected to said amplifier means input terminal; and a plurality of weighted circuits connected in parallel with said amplifier means, at least some of said weighted circuits including switch means, each one of said switch means being connected to a respective one of said counter means output terminals whereby said switch means will be responsive to the number loaded into said counter means and the voltage developed across said plurality of weighted circuits will be inversely proportional to the input signal.
Claim 3
Dependent Claim
25 words
The apparatus of claim 1 wherein said plurality of weighted circuits each includes a circuit element which presents a different resistance to current passing therethrough.
Claim 4
Dependent Claim
13 words
The apparatus of claim 2 wherein said counter means comprises a digital register.
Claim 5
Dependent Claim
27 words
The apparatus of claim 3 wherein said function generator is a reciprocal function generator and wherein said digital register accepts input signals in parallel or serial form.
Claim 6
Dependent Claim
28 words
The apparatus of claim 4 wherein said function generator further comprises means for subtracting a fixed number from the input signal prior to application to the counter means.
Claim 7
Dependent Claim
27 words
The apparatus of claim 3 wherein said function generator is a hyperbolic function generator and wherein said digital register accepts input signals in parallel or serial form.
Claim 8
Dependent Claim
16 words
The apparatus of claim 6 further comprising means for delaying input signals to said counter means.
References Cited (Backward Citations)
US3080555A
Cited
US3345505A
Cited
US3264457A
Cited
US3471779A
Cited
US3435196A
Cited
US3462588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |