US4529946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential amplifier circuit
Assignee: Toshiba Corp
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Filing: 1983-09-28
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Granted: 1985-07-16
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Expires: 2003-09-28
Abstract
Abstract A differential amplifier circuit producing sufficient output current with a broad linear working range, which includes first and second transistors coupled at their emitters in differential amplifier configuration, an input circuit means connected between the bases of the first and second transistors, third and fourth transistors connected to the collectors of the first and second transistors constituting collector loads of the first and second transistors respectively, first resistor inserted between the bases of the third and fourth transistors, second and third resistors respectively inserted between the base and collector of each of the third and fourth transistors, and an output circuit means connected to the third and fourth transistors.
Inventors
- 👤 Hiromi Kusakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:43
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3211
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A differential amplifier circuit comprising: first and second transistors coupled at their emitters with each other in differential amplifier configuration; input circuit means connected between the bases of said first and second transistors; third and fourth transistors connected to the collectors of said first and second transistors constituting collector loads of said first and second transistors respectively; first resistor inserted between the bases of said third and fourth transistors; second and third resistors respectively inserted between the base and collector of each of said third and fourth transistors; and output circuit means connected to said third and fourth transistors.
Claim 2
Dependent Claim
99 words
A differential amplifier circuit comprising: first and second transistors coupled at their emitters with each other in differential amplifier configuration; input circuit means connected between the bases of said first and second transistors; third and fourth transistors connected to the collectors of said first and second transistors constituting collector loads of said first and second transistors respectively; first resistor inserted between the bases of said third and fourth transistors; second and third resistors respectively inserted between the base and collector of each of said third and fourth transistors; and output circuit means connected to said third and fourth transistors.
Claim 3
Dependent Claim
18 words
A differential amplifier circuit according to claim 1, wherein said second and third resistors have equal resistance value.
Claim 4
Dependent Claim
46 words
A differential amplifier circuit according to claim 1, wherein said output circuit means is comprised of fifth and sixth transistors having their bases connected to said third and fourth transistors to constitute first and second current mirror circuits together with said third and fourth transistors respectively.
Claim 5
Dependent Claim
35 words
A differential amplifier circuit according to claim 3, further comprising: fourth and fifth resistors respectively connected to the bases of said fifth and sixth transistors and to the collector of the third and fourth transistor.
Claim 6
Dependent Claim
20 words
A differential amplifier circuit according to claim 4, wherein said second to fifth resistors each has the same resistance value.
References Cited (Backward Citations)
JPS4827664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |