US3116459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier having variable input impedance
Assignee: General Electric Co
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Filing: 1959-12-24
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Granted: 1963-12-31
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Expires: 1979-12-24
Abstract
No abstract record available.
Inventors
- 👤 Jerome J Tiemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:16
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/10; H03F3/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
AN AMPLIFIER HAVING A VARIABLE INPUT IMPEDANCE COMPRISING: AN AMPLIFIER CIRCUIT PORTION INCLUDING AN AMPLIFIER DEVICE, INPUT MEANS TO SAID DEVICE, VOLTAGE MEANS IN CIRCUIT WITH SAID DEVICE FOR APPLYING APPROPRIATE OPERATING POTENTIALS THERETO AND MEANS FOR TAKING A VOLTAGE OUTPUT FROM SAID AMPLIFIER CIRCUIT; A NARROW JUNCTION DEGENERATE SEMICONDUCTOR DIODE EXHIBITING A NEGATIVE RESISTANCE REGION IN THE LOW FORWARD VOLTAGE RANGE OF ITS CURRENT-VOLTAGE CHARACTERISTIC; MEANS CONNECTING SAID DIODE ACROSS THE INPUT OF SAID AMPLIFIER CIRCUIT PORTION; MEANS FOR CONNECTING THE INPUT OF SAID VARIABLE INPUT IMPEDANCE AMPLIFIER TO THE OUTPUT OF A SIGNAL SOURCE HAVING A VALUE OF OUTPUT IMPEDANCE DIFFERENT FROM THE INPUT IMPEDANCE OF SAID AMPLIFIER CIRCUIT PORTION; AND MEANS IN CIRCUIT WITH SAID DIODE BIASING SAID DIODE IN SAID NEGATIVE RESISTANCE REGION WHEREBY THE NEGATIVE RESISTANCE OF SAID DIODE IN PARALLEL COMBINATION WITH THE INPUT IMPEDANCE OF SAID AMPLIFIER CIRCUIT PORTION CAUSES THE FIRST VALUE OF INPUT IMPEDANCE OF SAID AMPLIFIER CIRCUIT TO BE CHANGED TO SUBSTANTIALLY THE VALUE OF THE OUTPUT IMPEDANCE OF SAID SIGNAL SOURCE.
Claim 2
Dependent Claim
172 words
AN AMPLIFIER HAVING A VARIABLE INPUT IMPEDANCE COMPRISING: AN AMPLIFIER CIRCUIT PORTION INCLUDING AN AMPLIFIER DEVICE, INPUT MEANS TO SAID DEVICE, VOLTAGE MEANS IN CIRCUIT WITH SAID DEVICE FOR APPLYING APPROPRIATE OPERATING POTENTIALS THERETO AND MEANS FOR TAKING A VOLTAGE OUTPUT FROM SAID AMPLIFIER CIRCUIT; A NARROW JUNCTION DEGENERATE SEMICONDUCTOR DIODE EXHIBITING A NEGATIVE RESISTANCE REGION IN THE LOW FORWARD VOLTAGE RANGE OF ITS CURRENT-VOLTAGE CHARACTERISTIC; MEANS CONNECTING SAID DIODE ACROSS THE INPUT OF SAID AMPLIFIER CIRCUIT PORTION; MEANS FOR CONNECTING THE INPUT OF SAID VARIABLE INPUT IMPEDANCE AMPLIFIER TO THE OUTPUT OF A SIGNAL SOURCE HAVING A VALUE OF OUTPUT IMPEDANCE DIFFERENT FROM THE INPUT IMPEDANCE OF SAID AMPLIFIER CIRCUIT PORTION; AND MEANS IN CIRCUIT WITH SAID DIODE BIASING SAID DIODE IN SAID NEGATIVE RESISTANCE REGION WHEREBY THE NEGATIVE RESISTANCE OF SAID DIODE IN PARALLEL COMBINATION WITH THE INPUT IMPEDANCE OF SAID AMPLIFIER CIRCUIT PORTION CAUSES THE FIRST VALUE OF INPUT IMPEDANCE OF SAID AMPLIFIER CIRCUIT TO BE CHANGED TO SUBSTANTIALLY THE VALUE OF THE OUTPUT IMPEDANCE OF SAID SIGNAL SOURCE.
References Cited (Backward Citations)
US2885494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-30 | 1967-07-01 | 1967-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-30 | 1971-07-01 | 1971-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-30 | 1975-07-01 | 1975-12-31 | $7700.00 | Window Closed / Lapsed |