US4649352A
Expired / Lapsed
US
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Differential amplifier circuit
Assignee: Signetics Corp
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Filing: 1986-06-16
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Granted: 1987-03-10
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Expires: 2006-06-16
Abstract
Abstract An input portion (4, 6) of a differential amplifier circuit amplifies a differential input signal to produce an amplified signal between a pair of terminals. A summing section contains two complementary pairs of like-polarity amplifiers (13, 14 and 19, 20). Each has a first flow electrode, a second flow electrode, and a control electrode. A substantially constant bias voltage is supplied to the control electrodes of the first pair (13, 14) whose second electrodes are respectively coupled to the second electrodes of the second pair (19, 20). Their first electrodes are respectively coupled to the terminals and to corresponding impedance elements (11, 12). The control electrodes of the second pair are coupled together to receive a voltage dependent on the voltage at the second electrode of one (13) of the first pair so as to produce a representative output signal at the second electrode of the other (14) of the first pair.
Inventors
- 👤 Robert A. Blauschild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:34
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/45179; H03F3/4521; H03F3/30; H03F3/3066; H03F3/4508; H03F3/45112; H03F3/45121; H03F2203/00; H03F2203/45; H03F2203/45028; H03F2203/45031; H03F2203/45224; H03F2203/45232; H03F2203/45244; H03F2203/45294; H03F2203/45366; H03F2203/45398; H03F2203/45471; H03F2203/45612
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
172 words
A differential amplifier circuit comprising: a differential input portion for amplifying a differential input signal to produce an amplified differential signal taken between a pair of terminals thereof; and first, second, third, and fourth main amplifiers, each having a first flow electrode, a second flow electrode, and a control electrode for controlling current transmission between the flow electrodes, the first and second amplifiers being of like polarity with their control electrodes connected together for receiving a substantially constant bias voltage, the third and fourth amplifiers being of like polarity with their control electrodes connected together for receiving a control voltage dependent on the voltage at the second electrode of the first amplifier, the third and fourth amplifiers being complementary to the first and second amplifiers, the first electrodes of the third and fourth amplifiers respectively coupled to the terminals, the second electrodes of the first and third amplifiers coupled together, and the second electrodes of the second and fourth amplifiers coupled together for supplying an output signal representative of the input signal.
Claim 2
Dependent Claim
172 words
A differential amplifier circuit comprising: a differential input portion for amplifying a differential input signal to produce an amplified differential signal taken between a pair of terminals thereof; and first, second, third, and fourth main amplifiers, each having a first flow electrode, a second flow electrode, and a control electrode for controlling current transmission between the flow electrodes, the first and second amplifiers being of like polarity with their control electrodes connected together for receiving a substantially constant bias voltage, the third and fourth amplifiers being of like polarity with their control electrodes connected together for receiving a control voltage dependent on the voltage at the second electrode of the first amplifier, the third and fourth amplifiers being complementary to the first and second amplifiers, the first electrodes of the third and fourth amplifiers respectively coupled to the terminals, the second electrodes of the first and third amplifiers coupled together, and the second electrodes of the second and fourth amplifiers coupled together for supplying an output signal representative of the input signal.
Claim 3
Dependent Claim
59 words
A circuit as in claim 1 further including (1) an impedance element coupled between a first voltage supply and the first electrode of the third amplifier and (2) an impedance element coupled between the first supply and the first electrode of the fourth amplifier, the first electrodes of the first and second amplifiers coupled to a second voltage supply.
Claim 4
Dependent Claim
43 words
A circuit as in claim 2 further including (1) a current source coupled between the second supply and the first electrode of the first amplifier and (2) a current source coupled between the second supply and the first electrode of the second amplifier.
Claim 5
Dependent Claim
14 words
A circuit as in claim 3 wherein each current source is an impedance element.
Claim 6
Dependent Claim
13 words
A circuit as in claim 4 wherein each impedance element is a resistor.
Claim 7
Dependent Claim
29 words
A circuit as in claim 3 wherein charge carriers that move between the flow electrodes of each amplifier originate at its first electrode and terminate at its second electrode.
Claim 8
Dependent Claim
20 words
A circuit as in claim 3 wherein the control electrode of the third amplifier is coupled to its second electrode.
Claim 9
Dependent Claim
26 words
A circuit as in claim 7 wherein the control and second electrodes of the third amplifier are connected together so that it acts like a diode.
Claim 10
Dependent Claim
75 words
A circuit as in claim 3 wherein the input portion comprises: a pair of like-polarity input amplifiers, each having a control electrode for controlling current transmission between first and second flow electrodes thereof, the first electrodes of the input amplifiers coupled together, the input signal being supplied to the control electrodes of the input amplifiers whose second electrodes are the terminals; and an input current source coupled to the first electrodes of the input amplifiers.
Claim 11
Dependent Claim
36 words
A circuit as in claim 9 wherein charge carriers that move between the flow electrodes of each amplifier originate at its first electrode and terminate at its second electrode under the control of its control electrode.
Claim 12
Dependent Claim
30 words
A circuit as in claim 10 wherein: the input amplifiers are complementary to the third and fourth main amplifiers; and the input current source is coupled to the second supply.
Claim 13
Dependent Claim
33 words
A circuit as in claim 11 wherein each amplifier is a bipolar transistor having a base, an emitter, and a collector which are respectively the control, first, and second electrodes of that amplifier.
Claim 14
Dependent Claim
21 words
A circuit as in claim 3 wherein the control voltage follows the voltage at the second electrode of the first amplifier.
Claim 15
Dependent Claim
19 words
A circuit as in claim 1 further including means for providing the bias voltage at its substantially constant value.
References Cited (Backward Citations)
US4377789A
Cited
US4463319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |