Patent US3854101A successfully refreshed from Google Patents.
US3854101A
Expired / Lapsed
US
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Differential amplifiers
Assignee: Yashica Co Ltd
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Filing: 1973-09-04
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Granted: 1974-12-10
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Expires: 1993-09-04
Abstract
Abstract In a differential amplifier including a pair of field effect transistors wherein output terminals are connected to the drain electrodes, input terminals are connected to the gate electrodes, a variable resistor is connected between the source electrodes and an intermediate point of the variable resistor is connected to a source of constant current, a transistor is associated with each one of the field effect transistors, the base electrode of each transistor is connected to the drain electrode of one field effect transistor associated therewith, and the collector electrode of each transistor is connected to the source electrode of the other field effect transistor.
Inventors
- 👤 S Muramatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:05
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/45278; H03F3/45282
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
In a differential amplifier of the type including a pair of field effect transistors, output terminals connected to the drain electrodes of said field effect transistors, input terminals connected to the gate electrodes of said field effect transistors, a variable resistor connected between the source electrodes of said field effect transistors, and a source of constant current connected to an intermediate point of said variable resistor, the improvement which comprises a pair of transistors each associated with one of said field effect transistors, means for connecting the base electrode of each transistor to the drain electrode of one field effect transistor associated therewith, and means to connect the collector electrode of each transistor to the source electrode of the other field effect transistor.
Claim 2
Dependent Claim
123 words
In a differential amplifier of the type including a pair of field effect transistors, output terminals connected to the drain electrodes of said field effect transistors, input terminals connected to the gate electrodes of said field effect transistors, a variable resistor connected between the source electrodes of said field effect transistors, and a source of constant current connected to an intermediate point of said variable resistor, the improvement which comprises a pair of transistors each associated with one of said field effect transistors, means for connecting the base electrode of each transistor to the drain electrode of one field effect transistor associated therewith, and means to connect the collector electrode of each transistor to the source electrode of the other field effect transistor.
Claim 3
Dependent Claim
76 words
The differential amplifier according to claim 1 wherein one terminal of said variable resistor connected to the source electrode of one field effect transistor is connected to the base electrode of one transistor associated with the other field effect transistor and the other terminal of said variable resistor connected to the source electrode of said other field effect transistor is connected to the base electrode of the other transistor associated with said one field effect transistor.
Claim 4
Dependent Claim
33 words
The differential amplifier according to claim 1 wherein the drain electrodes of said field effect transistors and the emitter electrodes of said transistors are connected to a source of voltage respectively through resistors.
Claim 5
Dependent Claim
82 words
An amplifier comprising a field effect transistor having a gate electrode connected to an input terminal, a source electrode connected to the ground through a resistor, and a drain electrode connected to an output terminal and to a source of voltage through a resistor, and a transistor having a base electrode connected to the drain electrode of said field effect transistor, an emitter electrode connected to the source electrode of said field effect transistor and a collector electrode connected to said source.
Claim 6
Dependent Claim
82 words
An amplifier comprising a field effect transistor having a gate electrode connected to an input terminal, a source electrode connected to the ground through a resistor, and a drain electrode connected to an output terminal and to a source of voltage through a resistor, and a transistor having a base electrode connected to the drain electrode of said field effect transistor, an emitter electrode connected to the source electrode of said field effect transistor and a collector electrode connected to said source.
References Cited (Backward Citations)
US27668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |