US3271528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable input impedance amplifier
Assignee: TDK Micronas GmbH
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Filing: 1963-02-07
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Granted: 1966-09-06
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Expires: 1983-02-07
Abstract
No abstract record available.
Inventors
- 👤 Lucio M Vallese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:29
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/62; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/18; H04B3/36; H04B3/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
AN AMPLIFIER COMPRISING: AN INPUT; AN OUTPUT; A FIRST ACTIVE ELEMENT COUPLED TO SAID INPUT CIRCUIT; A SECOND ACTIVE ELEMENT COUPLED BETWEEN THE OUTPUT OF SAID FIRST ACTIVE ELEMENT AND SAID OUTPUT; FIRST MEANS COUPLING SAID SECOND ACTIVE ELEMENT TO SAID FIRST ACTIVE ELEMENT TO PROVIDE POSITIVE FEEDBACK FOR SAID FIRST ACTIVE ELEMENT; AND SECOND MEANS COUPLED TO SAID FIRST MEANS TO CONTROL THE AMOUNT OF SAID FEEDBACK TO ADJUST THE INPUT IMPEDANCE OF SAID AMPLIFIER BETWEEN TWO VALUES INCLUDING ZERO IMPEDANCE AND A PREDETERMINED NEGATIVE IMPEDANCE WHILE MAINTAINING AN AMPLIFIED OUTPUT SIGNAL AT SAID OUTPUT.
Claim 2
Dependent Claim
96 words
AN AMPLIFIER COMPRISING: AN INPUT; AN OUTPUT; A FIRST ACTIVE ELEMENT COUPLED TO SAID INPUT CIRCUIT; A SECOND ACTIVE ELEMENT COUPLED BETWEEN THE OUTPUT OF SAID FIRST ACTIVE ELEMENT AND SAID OUTPUT; FIRST MEANS COUPLING SAID SECOND ACTIVE ELEMENT TO SAID FIRST ACTIVE ELEMENT TO PROVIDE POSITIVE FEEDBACK FOR SAID FIRST ACTIVE ELEMENT; AND SECOND MEANS COUPLED TO SAID FIRST MEANS TO CONTROL THE AMOUNT OF SAID FEEDBACK TO ADJUST THE INPUT IMPEDANCE OF SAID AMPLIFIER BETWEEN TWO VALUES INCLUDING ZERO IMPEDANCE AND A PREDETERMINED NEGATIVE IMPEDANCE WHILE MAINTAINING AN AMPLIFIED OUTPUT SIGNAL AT SAID OUTPUT.
References Cited (Backward Citations)
US2585078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |