Patent US3918014A successfully refreshed from Google Patents.
US3918014A
Expired / Lapsed
US
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Gyrator resonant circuit having regulation of supply current
Assignee: US Philips Corp
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Filing: 1974-07-17
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Granted: 1975-11-04
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Expires: 1994-07-17
Abstract
Abstract A gyrator resonant circuit comprising input and output gates having voltages shifted in phase by 90*, and a signal-dependent supply current source including two squaring devices and a summing device.
Inventors
- 👤 Johannes Otto Voorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:38
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/40; H03H11/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
197 words
A gyrator resonant circuit comprising: a first voltage controlled current source of positive transconductance and a second voltage-controlled current source of negative transconductance, the input of said first voltage-controlled current source being connected to the output of said second voltage-controlled current source to form a first gyrator gate and the input of said second voltage controlled current source being connected to the output of said first voltage controlled current source to form a second gyrator gate; a capacitance terminating each gate; a first squaring unit coupled to the first gate for producing the square of the signal applied to the input of said first voltage controlled current source, a second squaring unit coupled to the second gate for producing the square of the signal applied to the input of said second voltage controlled current source; a summing device connected to the outputs of said first and second squaring unit to produce the sum of the squared signals; and a plurality of signal dependent supply current sources for setting the direct currents flowing through the two voltage controlled current sources, each of said supply current sources having a control input connected to the output of said summing device.
Claim 2
Dependent Claim
197 words
A gyrator resonant circuit comprising: a first voltage controlled current source of positive transconductance and a second voltage-controlled current source of negative transconductance, the input of said first voltage-controlled current source being connected to the output of said second voltage-controlled current source to form a first gyrator gate and the input of said second voltage controlled current source being connected to the output of said first voltage controlled current source to form a second gyrator gate; a capacitance terminating each gate; a first squaring unit coupled to the first gate for producing the square of the signal applied to the input of said first voltage controlled current source, a second squaring unit coupled to the second gate for producing the square of the signal applied to the input of said second voltage controlled current source; a summing device connected to the outputs of said first and second squaring unit to produce the sum of the squared signals; and a plurality of signal dependent supply current sources for setting the direct currents flowing through the two voltage controlled current sources, each of said supply current sources having a control input connected to the output of said summing device.
Claim 3
Dependent Claim
31 words
A gyrator resonant circuit as claimed in claim 1, wherein the output of the summing device is connected to the control inputs of the supply current sources via a current multiplier.
References Cited (Backward Citations)
US3475690A
Cited
US3725799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |