US3569866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wideband vco with high phasestability
Assignee: National Aeronautics and Space Administration
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Filing: 1968-11-26
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Granted: 1971-03-09
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Expires: 1988-11-26
Abstract
Abstract This disclosure describes a wideband voltage controlled oscillator with high phase stability. A resonator consisting of a number of identical L-C resonators reactively coupled to the input and the output of a highly phase stable amplifier is described. The resonant frequency of each resonator is controlled by applying a modulating signal to voltage variable capacitors which form a portion of the resonators. In addition, the amplifier has electrically-variable negative feedback which improves its phase stability and simultaneously provides a means for maintaining the oscillations nearly sinusoidal. The invention described herein was made by an employee of the United States Government and may be manufactured and used by or for the Government for governmental purposes without the payment of any royalties thereon or therefor.
Inventors
- 👤 Chase P Hearn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:29
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/12; H03C3/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
226 words
A wideband voltage controlled oscillator with high phase stability comprising: a stable feedback amplifier having variable negative feedback for high phase stability; first and second voltage tuned resonators for controlling the frequency of oscillation coupled between the input and the output of said feedback amplifier; said first voltage tuned resonator including a first capacitor a first inductor and a first voltage variable capacitor connected in series with said first capacitor connected to the input of said feedback amplifier; said second voltage tuned resonator including a second capacitor, a second inductor and a second voltage variable capacitor connected in series with said second capacitor connected to the output of said feedback amplifier and with said second voltage variable capacitor connected to said first voltage variable capacitor; first bias means connected to the junction of said first capacitor and said first inductor; second bias means connected to the junction of said second capacitor and said second inductor; and means for connecting a modulation source to said first and second voltage tuned resonators, said means including a third inductor connected between said modulation source and the junction of said first and second voltage variable capacitors, a first resistor and a third capacitor connected in parallel between the junction of said first and second voltage variable capacitors and ground, and a fourth capacitor connected between said modulation source and ground.
Claim 2
Dependent Claim
226 words
A wideband voltage controlled oscillator with high phase stability comprising: a stable feedback amplifier having variable negative feedback for high phase stability; first and second voltage tuned resonators for controlling the frequency of oscillation coupled between the input and the output of said feedback amplifier; said first voltage tuned resonator including a first capacitor a first inductor and a first voltage variable capacitor connected in series with said first capacitor connected to the input of said feedback amplifier; said second voltage tuned resonator including a second capacitor, a second inductor and a second voltage variable capacitor connected in series with said second capacitor connected to the output of said feedback amplifier and with said second voltage variable capacitor connected to said first voltage variable capacitor; first bias means connected to the junction of said first capacitor and said first inductor; second bias means connected to the junction of said second capacitor and said second inductor; and means for connecting a modulation source to said first and second voltage tuned resonators, said means including a third inductor connected between said modulation source and the junction of said first and second voltage variable capacitors, a first resistor and a third capacitor connected in parallel between the junction of said first and second voltage variable capacitors and ground, and a fourth capacitor connected between said modulation source and ground.
Claim 3
Dependent Claim
171 words
A wideband voltage controlled oscillator with high phase stability as claimed in claim 1, wherein said stable feedback amplifier comprises: a controllable first amplifier having its input connected to said first capacitor; a second amplifier having its input connected to the output of said first amplifier; a fourth inductor having a tap, said Inductor connected between the output of said second amplifier and ground, the tap of said inductor connected to said second capacitor; a first diode having its cathode connected to the tap of said fourth inductor and its anode connected to the control input of said controllable first amplifier; a second diode; a third diode; said second and third diodes connected in series so that the cathode of said second diode is connected to the control input of said controllable first amplifier and the anode of said third anode is connected to the output of said second amplifier; and a fifth capacitor connected between the junction of said second and third diodes and the cathode of said first diode.
Claim 4
Dependent Claim
99 words
A wideband voltage controlled oscillator with high phase stability comprising: controllable amplifier means; an inductor having a tap connected to the output of said amplifier means; first and second diodes connected in series between the output and the control input of said amplifier means; a third diode connected between the control input of said amplifier means and said tap; a capacitor connected between said tap and the junction of said first and second diodes; and a multisection, voltage-tuned resonator for controlling the frequency of oscillation at said tap connected between said tap and the input to said amplifier means.
Claim 5
Dependent Claim
99 words
A wideband voltage controlled oscillator with high phase stability comprising: controllable amplifier means; an inductor having a tap connected to the output of said amplifier means; first and second diodes connected in series between the output and the control input of said amplifier means; a third diode connected between the control input of said amplifier means and said tap; a capacitor connected between said tap and the junction of said first and second diodes; and a multisection, voltage-tuned resonator for controlling the frequency of oscillation at said tap connected between said tap and the input to said amplifier means.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |