Patent US4633188A successfully refreshed from Google Patents.
US4633188A
Expired / Lapsed
US
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Mixer/amplifier circuit
Assignee: Alps Alpine Co Ltd
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Filing: 1985-11-20
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Granted: 1986-12-30
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Expires: 2005-11-20
Abstract
Abstract A mixer/amplifier circuit for selectively mixing a first input signal with a local oscillator signal or amplifying a second input signal. The mixer/amplifier circuit includes a transistor, a first circuit arrangement responsive to a first switching signal for enabling the transistor to operate as a grounded-base transistor to amplify the second input signal supplied to the emitter thereof, and a second circuit arrangement responsive to a second switching signal for enabling the transistor to operate as a grounded-emitter transistor to mix the first input signal supplied to the base thereof with the local oscillator.
Inventors
- 👤 Shigetoshi Matsuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:51
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/189; H03F3/19; H03D; H03D7/00; H03D7/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
A mixer/amplifier circuit for selectively mixing a first input signal with a local oscillator signal or amplifying a second input signal, said mixer/amplifier circuit comprising: (a) a transistor; (b) a first circuit arrangement responsive to a first switching signal for enabling said transistor to operate as a grounded-base transistor to amplify the second input signal supplied to the emitter thereof; and (c) a second circuit arrangement responsive to a second switching signal for enabling said transistor to operate as a grounded-emitter transistor to mix the first input signal supplied to the base thereof with the local oscillator.
Claim 2
Dependent Claim
97 words
A mixer/amplifier circuit for selectively mixing a first input signal with a local oscillator signal or amplifying a second input signal, said mixer/amplifier circuit comprising: (a) a transistor; (b) a first circuit arrangement responsive to a first switching signal for enabling said transistor to operate as a grounded-base transistor to amplify the second input signal supplied to the emitter thereof; and (c) a second circuit arrangement responsive to a second switching signal for enabling said transistor to operate as a grounded-emitter transistor to mix the first input signal supplied to the base thereof with the local oscillator.
Claim 3
Dependent Claim
21 words
A mixer/amplifier according to claim 1, wherein said first circuit arrangement comprises a diode connected to the base of said transistor.
Claim 4
Dependent Claim
21 words
A mixer/amplifier according to claim 1, wherein said second circuit arrangement comprises a diode connected to the emitter of said transistor.
References Cited (Backward Citations)
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Cited
US3482178A
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US3727140A
Cited
US3694756A
Cited
US3949306A
Cited
US4160953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |