US4774476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linearized differential amplifier
Assignee: Motorola Solutions Inc
•
Filing: 1987-07-06
•
Granted: 1988-09-27
•
Expires: 2007-07-06
Abstract
Abstract A linearized differential amplifier having two feedback paths. One of the feedback paths functions to linearize the output of the differential amplifier. The remaining feedback path functions to slightly limit the operating range of the differential amplifier to ensure the operational stability of the differential amplifier.
Inventors
- 👤 Lawrence M. Ecklund
- 👤 Charles J. Marik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:35
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F1/00; H03F1/32; H03F1/3211; H03F2203/00; H03F2203/45; H03F2203/45201
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
248 words
A linearized differential amplifier comprising: first and second transistors, wherein each of said transistors includes at least two emitters and a base; first and second amplifiers, wherein a first one of said amplifiers has a non-inverting input for connecting to receive an input signal and at least two inverting inputs, and wherein a second one of said amplifiers includes a non-inverting input for receiving a reference signal and at least two inverting inputs; a resistor coupled between a first one of said at least two emitters of said first transistor and said second transistor; a first feedback path connecting said first emitter of said first transistor to one of said inverting inputs of said first amplifier; a second feedback path wherein said first emitter of said second transistor couples to an inverting input of said second amplifier; a third feedback path wherein said second emitter of said first transistor connects to another inverting input of said first amplifier; a fourth feedback path wherein said second emitter of said second transistor couples to another inverting input of said second amplifier; wherein said first feedback path couples to a first current source; and said third feedback path couples to a second current source, wherein said second current source is smaller than said first current source; and wherein said second feedback path couples to a third current source and said fourth feedback path couples to a fourth current source, wherein said fourth current source is smaller than said third current source.
Claim 2
Dependent Claim
248 words
A linearized differential amplifier comprising: first and second transistors, wherein each of said transistors includes at least two emitters and a base; first and second amplifiers, wherein a first one of said amplifiers has a non-inverting input for connecting to receive an input signal and at least two inverting inputs, and wherein a second one of said amplifiers includes a non-inverting input for receiving a reference signal and at least two inverting inputs; a resistor coupled between a first one of said at least two emitters of said first transistor and said second transistor; a first feedback path connecting said first emitter of said first transistor to one of said inverting inputs of said first amplifier; a second feedback path wherein said first emitter of said second transistor couples to an inverting input of said second amplifier; a third feedback path wherein said second emitter of said first transistor connects to another inverting input of said first amplifier; a fourth feedback path wherein said second emitter of said second transistor couples to another inverting input of said second amplifier; wherein said first feedback path couples to a first current source; and said third feedback path couples to a second current source, wherein said second current source is smaller than said first current source; and wherein said second feedback path couples to a third current source and said fourth feedback path couples to a fourth current source, wherein said fourth current source is smaller than said third current source.
References Cited (Backward Citations)
US4710727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |