Patent US4749964A successfully refreshed from Google Patents.
US4749964A
Expired / Lapsed
US
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Superregenerative detector having a saw device in the feedback circuit
Assignee: RF Monolithics Inc
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Filing: 1986-12-08
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Granted: 1988-06-07
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Expires: 2006-12-08
Abstract
Abstract A superregenerative detector utilizing a single transistor and having a surface acoustic wave device in the feed back loop coupling the output to the input to cause oscillation wherein the surface acoustic wave device is a low loss delay line formed as a single phase unidirectional transducer on a quartz substrate.
Inventors
- 👤 Darrell L. Ash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:44
CPC Classifications
H; H03; H03D; H03D11/00; H03D11/02; H03D11/04; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/323; H03B5/36; H03B5/362; H03D11/06; H03D11/08; H03D2200/00; H03D2200/0041; H03D2200/0094; H03D2200/0096
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
A superregenerative detector comprising: a. an RF oscillator having an output and an input, b. a surface acoustic wave device forming a feedback loop for coupling said output to said input to cause said RF oscillations to occur, and c. a quench oscillator coupled to said RF oscillator for switching said RF oscillator between an oscillating and a non-oscillating condition.
Claim 2
Dependent Claim
60 words
A superregenerative detector comprising: a. an RF oscillator having an output and an input, b. a surface acoustic wave device forming a feedback loop for coupling said output to said input to cause said RF oscillations to occur, and c. a quench oscillator coupled to said RF oscillator for switching said RF oscillator between an oscillating and a non-oscillating condition.
Claim 3
Dependent Claim
35 words
A detector as in claim 1 further comprising: a. means for coupling a modulated RF signal to said oscillator input; and b. a low pass filter means coupled to said output to recover said modulation.
Claim 4
Dependent Claim
17 words
A detector as in claim 2 wherein said surface acoustic wave device is a low loss device.
Claim 5
Dependent Claim
14 words
A detector as in claim 3 wherein said SAW device is a delay line.
Claim 6
Dependent Claim
25 words
A detector as in claim 4 wherein said SAW device is a single phase unidirectional transducer formed on a piezoelectric substrate and has λ/4 electrodes.
Claim 7
Dependent Claim
16 words
A detector as in claim 5 wherein SAW device is formed on a quartz crystal substrate.
Claim 8
Independent Claim
66 words
A method of constructing a superregenerative detector comprising the steps of: a. forming an RF oscillator having an output and an input, b. coupling said output to said input with a surface acoustic wave device forming a feedback loop to cause said RF oscillations, and c. coupling a quench oscillator to said RF oscillator for switching said RF oscillator between an oscillating and a non-oscillating condition.
Claim 9
Independent Claim
66 words
A method of constructing a superregenerative detector comprising the steps of: a. forming an RF oscillator having an output and an input, b. coupling said output to said input with a surface acoustic wave device forming a feedback loop to cause said RF oscillations, and c. coupling a quench oscillator to said RF oscillator for switching said RF oscillator between an oscillating and a non-oscillating condition.
Claim 10
Dependent Claim
36 words
A method as in claim 7 further comprising the steps of: a. coupling a modulated RF signal to said oscillator input, and b. coupling a low pass filter means to said output to recover said modulation.
Claim 11
Dependent Claim
24 words
A method as in claim 8 further comprising the step of using a low loss surface acoustic wave device in said feed back loop.
Claim 12
Dependent Claim
23 words
A method as in claim 9 further including the step of using a surface acoustic wave delay line in said feed back loop.
Claim 13
Dependent Claim
29 words
A method as in claim 10 further comprising the step of using a single phase unidirectional transducer formed with λ/4 electrodes on a piezoelectric substrate as said SAW device.
Claim 14
Dependent Claim
22 words
A method as in claim 11 further comprising the step of forming said surface acoustic wave device on a quartz crystal substrate.
References Cited (Backward Citations)
US3868595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |