Patent US4318050A successfully refreshed from Google Patents.
US4318050A
Expired / Lapsed
US
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AM Detecting circuit
Assignee: Sony Corp
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Filing: 1980-02-29
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Granted: 1982-03-02
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Expires: 2000-02-29
Abstract
Abstract A single-ended push-pull amplifier converts a single-ended input into a balanced signal which, after amplification, is fed to the bases of alternately operating transistors, and the resulting inverted, or out-of-phase output currents of the inverting transistors are fed back to almost exactly equal the signal current fed to the amplifier. The base drives required to produce such fed-back currents are also fed to the bases of output driver circuit transistors where a full-wave rectified replica of the input signal is produced.
Inventors
- 👤 Taiwa Okanobu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:06
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/02; H03D1/06; H03D1/14; H03D1/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
77 words
An AM detecting circuit for detecting an AM signal having first and second polarities from a single-ended source comprising: means for alternately producing a first drive signal when said AM signal has said first polarity and a second drive signal when said AM signal has said second polarity; at least first and second class B amplifiers fsaid means for alternately producing; and means responsive to at least one of said drive signals for producing a detected output.
Claim 2
Dependent Claim
77 words
An AM detecting circuit for detecting an AM signal having first and second polarities from a single-ended source comprising: means for alternately producing a first drive signal when said AM signal has said first polarity and a second drive signal when said AM signal has said second polarity; at least first and second class B amplifiers fsaid means for alternately producing; and means responsive to at least one of said drive signals for producing a detected output.
Claim 3
Dependent Claim
68 words
A circuit according to claim 1; wherein said means responsive to at least one of said drive signals includes a third transistor responsive to said first drive signal to produce a first half-wave rectified signal and a fourth transistor responsive to said second drive signal to produce a second half-wave rectified signal, and means for combining said first and second half-wave rectified signals into a full-wave rectified signal.
Claim 4
Dependent Claim
22 words
A circuit according to claim 1; wherein said means for alternately producing first and second balanced drive signals includes a differential amplifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-01 | 1985-08-31 | 1986-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-01 | 1989-08-31 | 1990-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-01 | 1993-08-31 | 1994-03-02 | $7700.00 | Window Closed / Lapsed |