Patent US4481488A successfully refreshed from Google Patents.
US4481488A
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Trapped energy resonator for oscillator and multiple resonator applications
Assignee: CTS Corp
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Filing: 1982-11-08
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Granted: 1984-11-06
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Expires: 2002-11-08
Abstract
Abstract A trapped energy piezoelectric resonator for oscillator and multiple resonator applications has a piezoelectric substrate with electrodes disposed on each of its major surfaces. These electrodes are further comprised of a plurality of electrically interconnected and acoustically coupled sub-electrodes. The resonant frequency of these resonators may be controlled by varying the separation and, therefore, the acoustic coupling between the sub-electrodes. This resonator may be used in the feedback loop of an oscillator circuit as the frequency determining element. It may also be used to provide a resonator on a substrate carrying resonators of significantly different frequency.
Inventors
- 👤 Lawrence N. Dworsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:36
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03B; H03B5/00; H03B5/30; H03B5/32; H03H9/02; H03H9/02007; H03H9/02062; H03H9/0207; H03H9/02157; H03H9/125; H03H9/13; H03H9/132; H03H9/177; H03H9/46; H03H9/54; H03H9/56
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
194 words
A trapped energy piezoelectric resonator operating at a single resonant frequency and overtones thereof for independent use on a substrate having a plurality of resonators, comprising: a piezoelectric substrate having a first and a second opposed major surface; a first electrode disposed on said first major surface, said first electrode being comprised of a first plurality of acoustically coupled sub-electrodes; first means for electrically interconnecting said first plurality of sub-electrodes; a first conductor attached to said first electrode for electrical circuit connection thereto; a second electrode disposed on said second major surface, said second electrode being comprised of a second plurality of acoustically coupled sub-electrodes; second means for electrically interconnecting said second plurality of sub-electrodes; a second conductor attached to said second electrode for electrical circuit connection thereto; said first plurality of sub-electrodes being sufficiently acoustically coupled together and said second plurality of sub-electrodes being sufficiently acoustically coupled together for said first and second electrodes to operate as a resonator at a single resonant frequency and overtones thereof; and said resonator being sufficiently acoustically and electrically isolated from others of said plurality of resonators on said substrate to allow substantially independent and isolated operation.
Claim 2
Dependent Claim
194 words
A trapped energy piezoelectric resonator operating at a single resonant frequency and overtones thereof for independent use on a substrate having a plurality of resonators, comprising: a piezoelectric substrate having a first and a second opposed major surface; a first electrode disposed on said first major surface, said first electrode being comprised of a first plurality of acoustically coupled sub-electrodes; first means for electrically interconnecting said first plurality of sub-electrodes; a first conductor attached to said first electrode for electrical circuit connection thereto; a second electrode disposed on said second major surface, said second electrode being comprised of a second plurality of acoustically coupled sub-electrodes; second means for electrically interconnecting said second plurality of sub-electrodes; a second conductor attached to said second electrode for electrical circuit connection thereto; said first plurality of sub-electrodes being sufficiently acoustically coupled together and said second plurality of sub-electrodes being sufficiently acoustically coupled together for said first and second electrodes to operate as a resonator at a single resonant frequency and overtones thereof; and said resonator being sufficiently acoustically and electrically isolated from others of said plurality of resonators on said substrate to allow substantially independent and isolated operation.
Claim 3
Dependent Claim
18 words
The resonator of claim 1 wherein the peripheral geometry of said first and second electrodes is substantially rectangular.
Claim 4
Dependent Claim
22 words
The resonator of claim 2 wherein the geometric aspect ratio of said first and second electrodes is between approximately 0.5 and 2.0.
Claim 5
Dependent Claim
18 words
The resonator of claim 3 wherein the peripheral geometry of said first and second electrodes is approximately square.
Claim 6
Dependent Claim
29 words
The resonator of claim 1 wherein said first plurality of sub-electrodes is a first pair of sub-electrodes and said second plurality of sub-electrodes is a second pair of sub-electrodes.
Claim 7
Dependent Claim
23 words
The resonator of claim 5 wherein said first plurality of sub-electrodes is substantially symmetrical and said second plurality of sub-electrodes is substantially symmetrical.
Claim 8
Dependent Claim
26 words
The resonator of claim 6, wherein said first interconnecting means includes a first narrow conductor and said second interconnecting means includes a second narrow interconnecting conductor.
Claim 9
Dependent Claim
106 words
A trapped energy piezoelectric resonator comprising: a piezoelectric substrate having a first and a second opposed major surface; a first electrode exhibiting substantially square peripheral geometry disposed on said first major surface, said first electrode being comprised of a first pair of acoustically coupled sub-electrodes; a first narrow conductor electrically interconnecting said first pair of acoustically coupled sub-electrodes; a second electrode exhibiting substantially square peripheral geometry disposed on said second major surface and acoustically coupled to said first electrode, said second electrode being comprised of a second pair of acoustically coupled sub-electrodes; and a second narrow conductor electrically interconnecting said second pair of acoustically coupled sub-electrodes.
Claim 10
Dependent Claim
106 words
A trapped energy piezoelectric resonator comprising: a piezoelectric substrate having a first and a second opposed major surface; a first electrode exhibiting substantially square peripheral geometry disposed on said first major surface, said first electrode being comprised of a first pair of acoustically coupled sub-electrodes; a first narrow conductor electrically interconnecting said first pair of acoustically coupled sub-electrodes; a second electrode exhibiting substantially square peripheral geometry disposed on said second major surface and acoustically coupled to said first electrode, said second electrode being comprised of a second pair of acoustically coupled sub-electrodes; and a second narrow conductor electrically interconnecting said second pair of acoustically coupled sub-electrodes.
Claim 11
Dependent Claim
140 words
A crystal oscillator, comprising: an amplifier having a gain greater than one, and having an output and an input; a feedback network operatively connected from said amplifier's output to said amplifier's input to form a closed loop system, said feedback network including a piezoelectric resonator, comprising: (a) a piezoelectric substrate having a first and a second opposed major surface; (b) a first electrode disposed on said first major surface, said first electrode being comprised of a first pair of electrically and acoustically coupled sub-electrodes; (c) a second electrode disposed on said second major surface said second electrode being comprised of a second pair of electrically and acoustically coupled sub-electrodes; said closed loop system having a loop gain at equilibrium of one and a total phase shift around the loop of n×360 degrees, where n=0, 1, 2, . . . .
Claim 12
Dependent Claim
140 words
A crystal oscillator, comprising: an amplifier having a gain greater than one, and having an output and an input; a feedback network operatively connected from said amplifier's output to said amplifier's input to form a closed loop system, said feedback network including a piezoelectric resonator, comprising: (a) a piezoelectric substrate having a first and a second opposed major surface; (b) a first electrode disposed on said first major surface, said first electrode being comprised of a first pair of electrically and acoustically coupled sub-electrodes; (c) a second electrode disposed on said second major surface said second electrode being comprised of a second pair of electrically and acoustically coupled sub-electrodes; said closed loop system having a loop gain at equilibrium of one and a total phase shift around the loop of n×360 degrees, where n=0, 1, 2, . . . .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |