Operational amplifier
Abstract
Abstract A DIFFERENTIAL OPERATIONAL AMPLIFIER HAVING TWO INPUT AMPLIFIER STAGES WITH INDEPENDENT INPUTS AND PARALLELED OUTPUTS, THE INPUTS OF ONE STAGE BEING CONNECTABLE TO A LOW LEVEL, HIGH IMPEDANCE SOURCE, THE INPUT OR INPUTS OF THE OTHER STAGE BEING CONNECTABLE TOP NEGATIVE FEEDBACK RESISTORS FOR ADJUSTING THE CLOSED LOOP GAIN OF THE AMPLIFIER. THE RESPECTIVE OUTPUTS OF THE STAGES ARE APPLIED IN PARALLEL TO A DIFFERENTIAL-TO-SINGLE-ENDED AMPLIFIER STAGE. BY MAKING EACH INPUT AMPLIFIER STAGE WITH HIGH COMMON MODE REJECTION ABILITY, COMMON MODE ERRORS ARE ELIMINATED AT THE FRONT END OF THE AMPLIFIER. BY MATCHING THE CHARACTERISTICS OF THESE STAGES, OVERALL GAIN IS ADJUSTABLE WITHOUT INTRODUCING COMMON MODE ERRORS OR AFFECTING THE SIGNAL SOURCE.
Inventors
- 👤 Robert A Pease
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |