US3733559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential amplifier
Assignee: RCA Corp
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Filing: 1970-06-29
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Granted: 1973-05-15
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Expires: 1990-06-29
Abstract
Abstract The output circuit electrodes of first and second transistor input stages are coupled by unidirectional current conducting negative feedback means to the input circuit electrodes of the second and first stages respectively, the electrodes of each stage common to the input and output circuits thereof being coupled to one another by bidirectional current conducting means.
Inventors
- 👤 L Thorpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:15
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/4508; H03F3/45085; H03F3/45094; H03F3/26; H03F3/34; H03F3/343
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
211 words
A differential amplifier with overall negative feedback to provide a balanced differential signal output providing common mode rejection for signals applied respectively to two branches of an input stage, said amplifier comprising: first and second input stage signal amplifiers, each having a two-terminal input circuit and a two-terminal output circuit, one terminal being common to both input and output circuits; mans for impressing two signals upon the respective input circuits of said first and second input amplifiers; bidirectional current conducting means coupling said common terminals of said first and second input amplifiers so as to effect common mode signal rejection in the respective output circuits of said input amplifiers; and first and second unidirectional current conducting negative feedback circuits respectively coupled between said output circuit of said first input amplifier and said common terminal of said input circuit of said second input amplifier and from said output circuit of said second input amplifier to said common terminal of said input circuit of said first input amplifier, said first and second unidirectional current conducting negative feedback circuits respectfully including first and second signal output terminals for providing said balanced differential signal output between said first and second signal output terminals of said respective first and second unidirectional current conducting negative feedback circuits.
Claim 2
Dependent Claim
211 words
A differential amplifier with overall negative feedback to provide a balanced differential signal output providing common mode rejection for signals applied respectively to two branches of an input stage, said amplifier comprising: first and second input stage signal amplifiers, each having a two-terminal input circuit and a two-terminal output circuit, one terminal being common to both input and output circuits; mans for impressing two signals upon the respective input circuits of said first and second input amplifiers; bidirectional current conducting means coupling said common terminals of said first and second input amplifiers so as to effect common mode signal rejection in the respective output circuits of said input amplifiers; and first and second unidirectional current conducting negative feedback circuits respectively coupled between said output circuit of said first input amplifier and said common terminal of said input circuit of said second input amplifier and from said output circuit of said second input amplifier to said common terminal of said input circuit of said first input amplifier, said first and second unidirectional current conducting negative feedback circuits respectfully including first and second signal output terminals for providing said balanced differential signal output between said first and second signal output terminals of said respective first and second unidirectional current conducting negative feedback circuits.
Claim 3
Dependent Claim
95 words
A differential amplifier as defined in claim 1, wherein: said first and second feedback circuits each include an output amplifier; said output amplifier of said first unidirectional current conducting negative feedback circuit having an input circuit coupled to said output circuit of said first input aMplifier, and an output circuit coupled to said first signal output terminal; and said output amplifier of said second unidirectional current conducting negative feedback circuit having an input circuit coupled to said output circuit of said second input amplifier, and an output circuit coupled to said second signal output terminal.
Claim 4
Dependent Claim
81 words
A differential amplifier as defined in claim 2, wherein: said first and second unidirectional current conducting negative feedback circuits include respective first and second unidirectional current sources respectively connected to said common terminal of said respective second and first input amplifiers, each of said unidirectional current sources having a current-controlling terminal; and said first and second output circuits of said first and second output amplifiers being connected respectively to said current-controlling terminals of said respective first and second unidirectional current sources.
Claim 5
Dependent Claim
30 words
A differential amplifier as defined in claim 3, wherein: each of said output amplifiers of said first and second unidirectional current conducting negative feedback circuits is a signal polarity inverter.
Claim 6
Dependent Claim
63 words
A differential amplifier as defined in claim 4, wherein: each of said first and second input signal amplifiers comprises a transistor of which said two-terminal input circuit includes base and emitter electrodes and said two-terminal output circuit includes collector and emitter electrodes; and said bidirectional current conducting means comprises a resistive circuit coupling said emitter electrodes of said first and second input amplifiers.
Claim 7
Dependent Claim
132 words
A differential amplifier as defined in claim 5, wherein: each of said output signal amplifiers of said first and second unidirectional current conducting negative feedback circuits respectively include first and second drivers stages, each having an input and an output terminal, and first and second feedback pairs of transistors, each feedback pair having an input and an output terminal; means coupling said first and second driver stage input terminals respectively to said first and second input amplifier collector electrodes; means coupling said respective first and second driver stage output terminals to said respective input terminals of said first and second feedback pairs of transistors; and means coupling said respective output terminals of said first and second feedback pairs of transistors to said current-controlling terminals of said respective first and second current sources.
Claim 8
Dependent Claim
71 words
A differential amplifier as defined in claim 6, wherein said first and second driver stages respectively comprise: first and second transistors, each having base, emitter and collector electrodes, said first and second driver transistor emitter and collector electrodes respectively constituting said input and output terminals of said respective first and second driver stages, and said first and second driver transistor base electrodes being commonly connected to a source of fixed potential.
Claim 9
Dependent Claim
87 words
A differential amplifier as defined in claim 7, wherein: said first and second current sources respectively include first and second transistors, each having base, emitter and collector electrodes; said emitter and collector electrodes of said first and second unidirectional current source transistors being effectively in series circuits respectively with said emitter electrodes of said respective second and first input amplifier transistors; and said base electrodes of said first and second unidirectional current source transistors constituting said current-controlling terminals of said respective first and second unidirectional current sources.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |