US4524330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bipolar circuit for amplifying differential signal
Assignee: Signetics Corp
•
Filing: 1983-09-01
•
Granted: 1985-06-18
•
Expires: 2003-09-01
Abstract
Abstract A bipolar differential amplifying circuit contains a pair of input transistors (3 and 4) for receiving a differential input signal, a pair of differentially-configured first and second transistor circuits (5 and 6) coupled to the input transistors, and a subtracting circuit (11 and 12) for comparing the sum of the currents through first collectors (5C 1 and 6C 1 ) of the transistor circuits with the current through a second collector (6C 2 ) of the second transistor circuit to generate an output signal representative of the input signal. A PN diode (13) is coupled to a second collector (5C 2 ) of the first transistor circuit. The voltages at the collectors are very close, thereby yielding a high common-mode rejection ratio for the input signal.
Inventors
- 👤 Lajos Burgyan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:41
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/30; H03F3/3066; H03F3/45479; H03F2203/00; H03F2203/45; H03F2203/45346
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
188 words
A circuit comprising: first and second first-polarity bipolar input transistors having respective bases for receiving a differential input signal; first and second transistor means each comprising at least one second-polarity bipolar transistor having at least one emitter, at least one base, a first collector, and a second collector, the second polarity being opposite to the first polarity, the emitters coupled to a first voltage supply, each base of the first means coupled to an emitter of the first transistor, each base of the second means coupled to an emitter of the second transistor, and the first collectors coupled together; a PN diode forwardly coupled between the second collector of the first means and a second voltage supply; and subtracting means comprising at least one first-polarity bipolar transistor having a first collector coupled to the first collectors of the transistor means, at least one base each coupled to the first collector of the subtracting means, at least one emitter each coupled to the second supply, and a second collector coupled to the second collector of the second means for supplying a composite output signal representative of the input signal.
Claim 2
Dependent Claim
188 words
A circuit comprising: first and second first-polarity bipolar input transistors having respective bases for receiving a differential input signal; first and second transistor means each comprising at least one second-polarity bipolar transistor having at least one emitter, at least one base, a first collector, and a second collector, the second polarity being opposite to the first polarity, the emitters coupled to a first voltage supply, each base of the first means coupled to an emitter of the first transistor, each base of the second means coupled to an emitter of the second transistor, and the first collectors coupled together; a PN diode forwardly coupled between the second collector of the first means and a second voltage supply; and subtracting means comprising at least one first-polarity bipolar transistor having a first collector coupled to the first collectors of the transistor means, at least one base each coupled to the first collector of the subtracting means, at least one emitter each coupled to the second supply, and a second collector coupled to the second collector of the second means for supplying a composite output signal representative of the input signal.
Claim 3
Dependent Claim
31 words
A circuit as in claim 1 further including a main current source coupled between the first supply and the emitters of the transistor means separate from collectors of the input transistors.
Claim 4
Dependent Claim
82 words
A circuit as in claim 2 further including current-source means comprising at least one first-polarity bipolar transistor having a first collector coupled to the emitter of the first transistor, a second collector coupled to the emitter of the second transistor, a third collector commonly coupled to another collector of the first means and to another collector of the second means, at least one base each coupled to the third collector, and at least one emitter each coupled to the second voltage supply.
Claim 5
Dependent Claim
77 words
A circuit as in claim 3 further including: a first current amplifier for supplying an output terminal with a first output current signal of substantially the opposite phase to the output signal; and a second current amplifier for supplying the output terminal with a second output current signal substantially in phase with the output signal such that the output terminal provides a circuit output current equal to the difference between the current levels of the current signals.
Claim 6
Dependent Claim
20 words
A circuit as in claim 1 wherein each base of the subtracting means is directly connected to its first collector.
Claim 7
Dependent Claim
45 words
A circuit as in claim 5 further including: a pair of first and second input current sources respectively coupled to the emitters of the first and second transistors; and a main current source coupled between the first supply and the emitters of the transistor means.
Claim 8
Dependent Claim
34 words
A circuit as in claim 5 wherein the transistor means are substantially identical, their first collectors being substantially the same size and their second collectors being substantially twice the size of their first collectors.
Claim 9
Dependent Claim
24 words
A circuit as in claim 5 further including a main current source coupled between the first supply and the emitters of the transistor means.
Claim 10
Dependent Claim
32 words
A circuit as in claim 8 wherein said at least one transistor of each transistor means is a multi-collector transistor whose collectors comprise the first and second collectors of that transistor means.
Claim 11
Dependent Claim
73 words
A circuit as in claim 9 wherein said at least one transistor in the subtracting means is a pair of transistors, each having a base, an emitter, and a collector, both having their bases connected together, both having their emitters connected together, the collector of one connected to their bases and being the first collector of the subtracting means, and the collector of the other being the second collector of the subtracting means.
Claim 12
Dependent Claim
87 words
A circuit as in claim 5 furthr including current-source means comprising at least one first-polarity bipolar transistor having a first collector coupled to the emitter of the first transistor, a second collector coupled to the emitter of the second transistor, a third collector commonly coupled to a third collector of the first means and to a third collector of the second means, at least one base each coupled to the third collector of the current-source means, and at least one emitter each coupled to the second supply.
Claim 13
Dependent Claim
42 words
A circuit as in claim 11 wherein the transistor means are substantially identical, their first collectors being substantially the same size, their second collectors being substantially twice the size of their first collectors, and their third collectors being substantially the same size.
Claim 14
Dependent Claim
78 words
A circuit as in claim 11 wherein said at least one transistor in the current-source means is three transistors, each having a base, an emitter, and a collector, all three having their bases connected together, the collector of one being the first collector of the current-source means, the collector of another being the second collector of the current-source means, and the collector of the last connected to their bases and being the third collector of the current-source means.
Claim 15
Dependent Claim
24 words
A circuit as in claim 11 further including a main current source coupled between the first supply and the emitters of the transistor means.
Claim 16
Dependent Claim
65 words
A circuit as in claim 11 further including: a first-polarity further transistor having a base coupled to the second collectors of the second and subtracting means, an emitter for providing a further signal substantially in phase with the composite output signal, and a collector coupled to the first supply; and an impedance element coupled between the second supply and the emitter of the further transistor.
Claim 17
Dependent Claim
23 words
A circuit as in claim 15 further including a Zener diode coupled between the second supply and the base of the further transistor.
Claim 18
Dependent Claim
78 words
A circuit as in claim 16 further including; a first current amplifier for supplying an output terminal with a first output current signal of substantially opposite phase to the composite output signal; and a second current amplifier for supplying the output terminal with a second output current signal substantially in phase with the composite output signal such that the output terminal provides a circuit output current equal to the difference between the current levels of the current signals.
Claim 19
Dependent Claim
113 words
A circuit as in claim 17 wherein: the first current amplifier comprises (1) a first voltage-to-current converter for generating a first intermediate current of substantially opposite phase to the further signal and (2) a first output device connected to the output terminal for supplying the first output current signal in response to a voltage corresponding to the first intermediate current; and the second current amplifier comprises (1) a second voltage-to-current converter for generating a second intermediate current substantially in phase with the further signal and (2) a second output device connected to the output terminal for supplying the second output current signal in response to a voltage corresponding to the second intermediate current.
Claim 20
Dependent Claim
61 words
A circuit as in claim 18 wherein each voltage-to-current converter comprises (1) a second-polarity third bipolar transistor having a base for receiving the further signal and having a collector coupled to the second supply and (2) a first-polarity fourth bipolar transistor having a base coupled to an emitter of the third transistor and having an emitter coupled to the second supply.
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) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |