US4037167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic gain control amplifier
Assignee: Individual
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Filing: 1976-09-20
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Granted: 1977-07-19
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Expires: 1996-09-20
Abstract
Abstract An AM converter and AGC amplifier are described for use either separately or in combination in a radio receiver. The AGC amplifier includes a semiconductor device directly coupled to the amplifier input for receiving automatic gain control signals. The AM converter includes a single mixer transistor directly coupled to both an RF amplifier and local oscillator. The converter circuit provides attenuation of the oscillator signal by up to 60 d.b. relative to the R.F. signal, greatly reducing the necessary I.F. filtering. Both the converter and AGC circuits are fabricated on integrated circuit chips.
Inventors
- 👤 Kingsley N. Hastings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:08
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
An automatic gain control amplifier comprising: a. at least one transistor amplifier having a base, collector, and emitter, said collector being connected to a D.C. supply voltage through a collector resistor, said emitter being connected to ground; b. a tuned circuit including transformer means for applying a signal of a predetermined frequency to said base; c. a biasing resistor coupled between said collector and said tuned circuit, said biasing resistor being much larger than said collector resistor; d. transistor means coupled between the base of said transistor amplifier and ground for controlling the gain of said amplifier in response to a gain control signal; and e. capacitor means in the base circuit of said amplifier coupled between said transformer means and ground for providing an A.C. path to ground.
Claim 2
Dependent Claim
129 words
An automatic gain control amplifier comprising: a. at least one transistor amplifier having a base, collector, and emitter, said collector being connected to a D.C. supply voltage through a collector resistor, said emitter being connected to ground; b. a tuned circuit including transformer means for applying a signal of a predetermined frequency to said base; c. a biasing resistor coupled between said collector and said tuned circuit, said biasing resistor being much larger than said collector resistor; d. transistor means coupled between the base of said transistor amplifier and ground for controlling the gain of said amplifier in response to a gain control signal; and e. capacitor means in the base circuit of said amplifier coupled between said transformer means and ground for providing an A.C. path to ground.
Claim 3
Dependent Claim
25 words
The amplifier of claim 1 wherein said transistors are contained on an integrated circuit chip and all other circuit components are external to said chip.
Claim 4
Dependent Claim
15 words
The amplifier of claim 1 wherein means are provided for filtering said gain control signal.
References Cited (Backward Citations)
US3447094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |