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Patent US3701036A successfully refreshed from Google Patents.
US3701036A
Expired / Lapsed
US
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Variable gain amplifier system
Assignee: Anritsu Co
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Filing: 1970-09-28
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Granted: 1972-10-24
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Expires: 1990-09-28
Abstract
Abstract A variable gain amplifier system for providing a tuning voltage to a radio frequency oscillator to linearize its voltage to output frequency characteristic includes an operational amplifier where the feedback loop which controls the gain of the amplifier is coupled to both positive and negative feedback networks. The positive feedback network consists of several diode-resistor legs which inject current into the feedback loop at different input control voltage levels to thus vary the gain of the amplifier. Similarly a negative feedback network consists of several dioderesistor legs which drain current from the amplifier feedback loop at various levels of the input control voltage to increase gain.
Inventors
- 👤 Rudy S Stefenel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:40
CPC Classifications
H; H03; H03K; H03K6/00; H03K6/02; H03G; H03G3/00; H03G3/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
189 words
A variable gain amplifier system responsive to an input control voltage signal varying with time to produce an output voltage which is a shaped function of the input voltage said system comprising: amplifier means having feedback means for varying the gain of saiD amplifier means, an increase or decrease in the amount of feedback signal increasing or decreasing the gain of said amplifier means; first circuit network means coupled to said feedback means and responsive to increasing magnitudes of said input control voltage signal for increasing the gain of said amplifier means in a plurality of discrete gain values, each of such values corresponding to a predetermined voltage level of said input control voltage signal; and second circuit network means coupled to said feedback means and responsive to increasing magnitude of said input control voltage signal for decreasing the gain of said amplifier means in a plurality of discrete gain values, each of such values corresponding to a predetermined voltage level of said input control voltage signal whereby said output signal is a function of said input signal which has been shaped in accordance with said discrete gain values.
Claim 2
Dependent Claim
189 words
A variable gain amplifier system responsive to an input control voltage signal varying with time to produce an output voltage which is a shaped function of the input voltage said system comprising: amplifier means having feedback means for varying the gain of saiD amplifier means, an increase or decrease in the amount of feedback signal increasing or decreasing the gain of said amplifier means; first circuit network means coupled to said feedback means and responsive to increasing magnitudes of said input control voltage signal for increasing the gain of said amplifier means in a plurality of discrete gain values, each of such values corresponding to a predetermined voltage level of said input control voltage signal; and second circuit network means coupled to said feedback means and responsive to increasing magnitude of said input control voltage signal for decreasing the gain of said amplifier means in a plurality of discrete gain values, each of such values corresponding to a predetermined voltage level of said input control voltage signal whereby said output signal is a function of said input signal which has been shaped in accordance with said discrete gain values.
Claim 3
Dependent Claim
31 words
A system as in claim 1 where said first and second network means drain and inject current from and into said feedback means for controlling said gain of said amplifier means.
Claim 4
Dependent Claim
65 words
A system as in claim 1 where said first network is shunt connected to said feedback means and drains current from said feedback means in successively greater discrete steps corresponding to said discrete gain values and where said second network is shunt connected to said feedback means and injects current into said feedback means in successively greater discrete steps corresponding to said discrete gain values.
Claim 5
Dependent Claim
41 words
A system as in claim 1 where each of said first and second networks includes a plurality of legs each of which is biased to be placed in a conductive mode at a unique level of said input control voltage signal.
Claim 6
Dependent Claim
26 words
A system as in claim 4 where each of said legs includes a diode which is normally biased to place the leg in a nonconductive state.
Claim 7
Dependent Claim
66 words
A system as in claim 5 where each of said legs of said first network includes resistor means series coupled to said diode and a voltage source coupled to said resistor means for back-biasing said diode to a unique value said diode also being responsive to said input control voltage overcoming said back-biasing to become conductive and allow current to be drained from said feedback means.
Claim 8
Dependent Claim
123 words
A system as in claim 5 where said gain of said first amplifier means approaches infinity so that said feedback signal is substantially identical to said input control voltage signal where said second network includes second amplifier means for amplifying said feedback signal, an output terminal of said second amplifier means providing an amplified feedback signal, each of said legs of said second network including resistor means series coupled to said respective diodes, said output terminal being coupled to said diodes, said amplified feedback signal normally back-biasing said diodes to unique values as determined by said resistor means said diodes also being responsive to said feedback signal overcoming said back-biasing to become conductive and allow current to be injected into said feedback means.
References Cited (Backward Citations)
US3525948A
Cited
US3489311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |