US3360737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifying system having high speed and high accuracy gain control
Assignee: Texas Instruments Inc
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Filing: 1964-07-31
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Granted: 1967-12-26
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Expires: 1984-07-31
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Harris
- 👤 Paul E Carroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:08
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3005; H03G3/301; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
217 words
A SYSTEM FOR CONTROLLING THE GAIN OF AN AMPLIFIER, COMPRISING: MEANS FOR PRODUCING AN AC CONTROL VOLTAGE HAVING A FREQUENCY OUTSIDE THE FREQUENCY BAND OF INTEREST AND HAVING A SELECTIVELY VARIABLE AMPLITUDE, MEANS FOR APPLYING SAID CONTROL VOLTAGE TO SAID AMPLIFIER, MEANS FOR SELECTIVELY SENSING ONLY THE AMPLITUDE OF THE AC CONTROL VOLTAGE FREQUENCY IN THE OUTPUT OF SAID AMPLIFIER, A SECOND AMPLIFIER FOR AMPLIFYING THE SENSED FREQUENCY, A COMPARATOR AMPLIFIER HAVING A PAIR OF INPUTS, ONE OF WHICH IS AC COUPLED TO THE OUTPUT OF THE SECOND AMPLIFIER, A DC REFERENCE VOLTAGE SOURCE, MEANS FOR APPLYING THE DC REFERENCE VOLTAGE FROM SAID DC REFERENCE VOLTAGE SOURCE ACROSS THE PAIR OF INPUTS TO THE COMPARATOR AMPLIFIER, WHEREBY ONLY THAT PORTION OF THE HALF-CYCLES OF THE AC CONTROL VOLTAGE FREQUENCY APPLIED TO THE COMPARATOR AMPLIFIER WHICH EXCEEDS THE REFERENCE VOLTAGE WILL BE AMPLIFIED BY THE COMPARATOR AMPLIFIER TO PRODUCE AN ERROR SIGNAL, MEANS FOR APPLYING THE ERROR SIGNAL TO SAID AMPLIFIER, AND MEANS IN SAID AMPLIFIER FOR VARYING THE GAIN THEREOF RESPONSIVE TO SAID ERROR SIGNAL IN A DIRECTION TENDING TO MAINTAIN THE AMPLITUDE OF THE AC CONTROL VOLTAGE FREQUENCY IN THE OUTPUT OF SAID AMPLIFIER AT A CONSTANT LEVEL, WHEREBY THE GAIN OF THE AMPLIFIER WILL BE INVERSELY PROPORTIONAL TO THE AMPLITUDE OF THE AC CONTROL VOLTAGE.
Claim 2
Independent Claim
217 words
A SYSTEM FOR CONTROLLING THE GAIN OF AN AMPLIFIER, COMPRISING: MEANS FOR PRODUCING AN AC CONTROL VOLTAGE HAVING A FREQUENCY OUTSIDE THE FREQUENCY BAND OF INTEREST AND HAVING A SELECTIVELY VARIABLE AMPLITUDE, MEANS FOR APPLYING SAID CONTROL VOLTAGE TO SAID AMPLIFIER, MEANS FOR SELECTIVELY SENSING ONLY THE AMPLITUDE OF THE AC CONTROL VOLTAGE FREQUENCY IN THE OUTPUT OF SAID AMPLIFIER, A SECOND AMPLIFIER FOR AMPLIFYING THE SENSED FREQUENCY, A COMPARATOR AMPLIFIER HAVING A PAIR OF INPUTS, ONE OF WHICH IS AC COUPLED TO THE OUTPUT OF THE SECOND AMPLIFIER, A DC REFERENCE VOLTAGE SOURCE, MEANS FOR APPLYING THE DC REFERENCE VOLTAGE FROM SAID DC REFERENCE VOLTAGE SOURCE ACROSS THE PAIR OF INPUTS TO THE COMPARATOR AMPLIFIER, WHEREBY ONLY THAT PORTION OF THE HALF-CYCLES OF THE AC CONTROL VOLTAGE FREQUENCY APPLIED TO THE COMPARATOR AMPLIFIER WHICH EXCEEDS THE REFERENCE VOLTAGE WILL BE AMPLIFIED BY THE COMPARATOR AMPLIFIER TO PRODUCE AN ERROR SIGNAL, MEANS FOR APPLYING THE ERROR SIGNAL TO SAID AMPLIFIER, AND MEANS IN SAID AMPLIFIER FOR VARYING THE GAIN THEREOF RESPONSIVE TO SAID ERROR SIGNAL IN A DIRECTION TENDING TO MAINTAIN THE AMPLITUDE OF THE AC CONTROL VOLTAGE FREQUENCY IN THE OUTPUT OF SAID AMPLIFIER AT A CONSTANT LEVEL, WHEREBY THE GAIN OF THE AMPLIFIER WILL BE INVERSELY PROPORTIONAL TO THE AMPLITUDE OF THE AC CONTROL VOLTAGE.
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) | 1970-12-25 | 1971-06-26 | 1971-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-25 | 1975-06-26 | 1975-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-25 | 1979-06-26 | 1979-12-26 | $7700.00 | Window Closed / Lapsed |