US3395359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential amplifier
Assignee: Electronic Associates Inc
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Filing: 1965-01-04
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Granted: 1968-07-30
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Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Zachev Ivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:36
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3069; H03F3/3071; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
228 words
A DIFFERENTIAL AMPLIFIER HAVING AT LEAST A FIRST AND A SECOND DIFFERENTIAL STAGE COMPRISING, A FIRST AND A SECOND INPUT TERMINAL AND AN OUTPUT TERMINAL, SAID FIRST DIFFERENTIAL STAGE HAVING A FIRST TRANSISTOR CONNECTED TO SAID FIRST INPUT TERMINAL AND A SECOND TRANSISTOR CONNECTED TO SAID SECOND INPUT TERMINAL AND IN WHICH THE BASE-TO-EMITTER OFFSET VOLTAGE (VBE) OF SAID SECOND TRANSISTOR IS SELECTED TO HAVE A SUBSTANTIALLY GREATER VALUE THAN THE VBE OF SAID FIRST TRANSISTOR, SAID SECOND DIFFERENTIAL STAGE HAVING A THIRD AND A FOURTH TRANSISTOR IN WHICH THE VBE OF SAID THIRD TRANSISTOR IS SELECTED TO HAVE A SUBSTANTIALLY GREATER VALUE THEN THE VBE OF SAID TRANSISTOR, MEANS CONNECTING (1) AN OUTPUT OF SAID FIRST TRANSISTOR TO AN OUTPUT OF SAID THIRD TRANSISTOR AND (2) AN OUTPUT OF SAID SECOND TRANSISTOR TO AN INPUT OF SAID FOURTH TRANSISTOR, TO PRODUCE AT AN OUTPUT CIRCUIT OF SAID SECOND DIFFERENTIAL STAGE A TOTAL VOLTAGE DRIFT EQUAL TO THE ARTHMETIC SUM OF THE AMPLITUDE DRIFT OF SAID FIRST STAGE AND THE DRIFT OF SAID SECOND STAGE, AND A SINGLE TEMPERATURE COEFFICIENT RESISTOR, SAID RESISTOR VARYING IN RESISTANCE WITH TEMPERATURE CHANGE AND BEING CONNECTED TO SAID FIRST DIFFERENTIAL STAGE TO PRODUCE A VOLTAGE VARIATION AT SAID OUTPUT CIRCUIT OF MAGNITUDE SUBSTANTIALLY EQUAL TO AND OF DIRECTION OPPOSITE TO SAID TOTAL VOLTAGE DRIFT THEREBY TO SUBSTANTIALLY MINIMIZE SAID TOTAL VOLTAGE DRIFT.
Claim 2
Dependent Claim
228 words
A DIFFERENTIAL AMPLIFIER HAVING AT LEAST A FIRST AND A SECOND DIFFERENTIAL STAGE COMPRISING, A FIRST AND A SECOND INPUT TERMINAL AND AN OUTPUT TERMINAL, SAID FIRST DIFFERENTIAL STAGE HAVING A FIRST TRANSISTOR CONNECTED TO SAID FIRST INPUT TERMINAL AND A SECOND TRANSISTOR CONNECTED TO SAID SECOND INPUT TERMINAL AND IN WHICH THE BASE-TO-EMITTER OFFSET VOLTAGE (VBE) OF SAID SECOND TRANSISTOR IS SELECTED TO HAVE A SUBSTANTIALLY GREATER VALUE THAN THE VBE OF SAID FIRST TRANSISTOR, SAID SECOND DIFFERENTIAL STAGE HAVING A THIRD AND A FOURTH TRANSISTOR IN WHICH THE VBE OF SAID THIRD TRANSISTOR IS SELECTED TO HAVE A SUBSTANTIALLY GREATER VALUE THEN THE VBE OF SAID TRANSISTOR, MEANS CONNECTING (1) AN OUTPUT OF SAID FIRST TRANSISTOR TO AN OUTPUT OF SAID THIRD TRANSISTOR AND (2) AN OUTPUT OF SAID SECOND TRANSISTOR TO AN INPUT OF SAID FOURTH TRANSISTOR, TO PRODUCE AT AN OUTPUT CIRCUIT OF SAID SECOND DIFFERENTIAL STAGE A TOTAL VOLTAGE DRIFT EQUAL TO THE ARTHMETIC SUM OF THE AMPLITUDE DRIFT OF SAID FIRST STAGE AND THE DRIFT OF SAID SECOND STAGE, AND A SINGLE TEMPERATURE COEFFICIENT RESISTOR, SAID RESISTOR VARYING IN RESISTANCE WITH TEMPERATURE CHANGE AND BEING CONNECTED TO SAID FIRST DIFFERENTIAL STAGE TO PRODUCE A VOLTAGE VARIATION AT SAID OUTPUT CIRCUIT OF MAGNITUDE SUBSTANTIALLY EQUAL TO AND OF DIRECTION OPPOSITE TO SAID TOTAL VOLTAGE DRIFT THEREBY TO SUBSTANTIALLY MINIMIZE SAID TOTAL VOLTAGE DRIFT.
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) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |