US3862431A
Expired / Lapsed
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Signal processing apparatus
Assignee: Leland Stanford Junior University
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Filing: 1973-06-04
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Granted: 1975-01-21
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Expires: 1993-06-04
Abstract
Abstract Signal processing apparatus wherein acoustic waves are generated and propagated through a piezoelectric semiconductor so as to parametrically interact adjacent to an output electrode so as to provide electric fields which vary the depletion layer adjacent to the output electrode to drive the output circuit.
Inventors
- 👤 Calvin F Quate
- 👤 Stephen Ludvik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:12
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
Signal processing apparatus which comprises a piezoelectric semiconductor capable of propagating acoustic waves, transducer means for applying two electromagnetic signals to said piezoelectric semiconductor such that acoustic waves are generated therein and are translated with respect to one another during propagation so as to parametrically interact at an overlapping position in said piezoelectric semiconductor, and an output electrode forming a rectifying barrier at the surface of said piezoelectric semiconductor at the wave-overlapping position to sense variations in the depletion layer resultant from the electric fields caused by the parametric wave interaction.
Claim 2
Dependent Claim
91 words
Signal processing apparatus which comprises a piezoelectric semiconductor capable of propagating acoustic waves, transducer means for applying two electromagnetic signals to said piezoelectric semiconductor such that acoustic waves are generated therein and are translated with respect to one another during propagation so as to parametrically interact at an overlapping position in said piezoelectric semiconductor, and an output electrode forming a rectifying barrier at the surface of said piezoelectric semiconductor at the wave-overlapping position to sense variations in the depletion layer resultant from the electric fields caused by the parametric wave interaction.
Claim 3
Dependent Claim
33 words
Signal processing apparatus according to claim 1 wherein said piezoelectric semiconductor is a crystal so oriented relative to said transducer means so that the acoustic waves take the form of surface shear waves.
Claim 4
Dependent Claim
27 words
Signal processing apparatus according to claim 1 which comprises means for generating two electromagnetic signals of identical frequency and identical pulses for application to said transducer means.
Claim 5
Dependent Claim
21 words
Signal processing apparatus according to claim 1 which comprises means for applying a predetermined DC bias voltage to said output electrode.
Claim 6
Dependent Claim
18 words
Signal processing apparatus according to claim 1 which comprises means for varying the temperature of said piezoelectric semiconductor.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |