US3596197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced parametric amplifiers
Assignee: MA Com Inc
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Filing: 1969-03-25
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Granted: 1971-07-27
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Expires: 1989-03-25
Abstract
Abstract Examples are described of a balanced parametric amplifier employing two loosely-coupled strip conductors, one of which is fed signals via a strip conductor connected at its center. Varactors are connected from each end of the signal-side strip to a ground plane, which completes the idler circuit. The pump standing wave is adjusted to place a null at the signal point and to apply equal amplitude, opposite-phase pump voltages to the varactors.
Inventors
- 👤 Paul Chorney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:31
CPC Classifications
H; H03; H03F; H03F7/00; H03F7/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
153 words
A balanced parametric amplifier comprising first and second transmission lines coupled together over a prescribed electrical length, first applied-energy variable impedance means coupled to a first terminal to one end of the coupled length of said first line, second applied-energy variable impedance means coupled to a second terminal at the other end of the coupled length of said first line, signal means coupled to said first line substantially in the center of its coupled length, means completing a current loop for idler current through said coupled length and both of said variable impedance means, said second line having an input terminal for pump frequency energy at one end of the coupled length, and means at the other end of the coupled length of said second line to adjust a standing wave of pump voltage to apply pump energy to said variable impedance means with substantially equal amplitudes but substantially 180* out of phase.
Claim 2
Dependent Claim
153 words
A balanced parametric amplifier comprising first and second transmission lines coupled together over a prescribed electrical length, first applied-energy variable impedance means coupled to a first terminal to one end of the coupled length of said first line, second applied-energy variable impedance means coupled to a second terminal at the other end of the coupled length of said first line, signal means coupled to said first line substantially in the center of its coupled length, means completing a current loop for idler current through said coupled length and both of said variable impedance means, said second line having an input terminal for pump frequency energy at one end of the coupled length, and means at the other end of the coupled length of said second line to adjust a standing wave of pump voltage to apply pump energy to said variable impedance means with substantially equal amplitudes but substantially 180* out of phase.
Claim 3
Dependent Claim
21 words
An amplifier according to claim 1 in which said electrical length is adjusted so that the idler impedance is substantially zero.
Claim 4
Dependent Claim
40 words
An amplifier according to claim 1 in which said variable impedance means are varactors having one pair of like electrodes connected respectively to said first aNd second terminals and the remaining pair of like electrodes connected to a common ground.
Claim 5
Dependent Claim
37 words
An amplifier according to claim 3 in which said adjusting means for said second line is an extension of said second line for a prescribed electrical length beyond said coupled section and terminated in said common ground.
Claim 6
Dependent Claim
17 words
An amplifier according to claim 1 in which said lines are strip conductors in a parallel-plate system.
Claim 7
Dependent Claim
29 words
An amplifier according to claim 3 in which said lines are strip conductors in a parallel plate system, and said common ground is a ground plane of said system.
Claim 8
Dependent Claim
88 words
A balanced parametric amplifier system comprising first and second amplifiers each according to claim 1, hybrid junction means having first, second, third and fourth terminals and the property that a signal introduced via said first terminal is transmitted to said second and third terminals and similar signals introduced at said second and third terminals combine to appear at said fourth terminal, the signal means of said first amplifier being coupled to said second terminal, and the signal means of said second amplifier being coupled to said third terminal.
Claim 9
Dependent Claim
36 words
A balanced amplifier system according to claim 7 in which the second transmission lines of said amplifiers are successive segments of a single transmission line for supporting a single pump voltage standing wave for both amplifiers.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |