US4600898A
Expired / Lapsed
US
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One-pin crystal oscillator
Assignee: University of California
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Filing: 1984-03-26
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Granted: 1986-07-15
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Expires: 2004-03-26
Abstract
Abstract A one-pin crystal oscillator 20 is designed to be used as a clock generator for digital integrated circuits. Unlike the prior art, this oscillator requires only one package pin to connect the crystal as opposed to the usual two pin requirement and, except for the crystal, can be completely fabricated on a chip so as to require no other external components.
Inventors
- 👤 Joseph T. Santos
- 👤 Robert G. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:59
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03B5/364; H03B2200/00; H03B2200/0002; H03B2200/0012
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
77 words
An oscillator circuit comprising: a crystal; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; said crystal connected between the gate of the first transistor and the ground; and wherein said first and second transistors are depletion mode field-effect transistors.
Claim 2
Dependent Claim
77 words
An oscillator circuit comprising: a crystal; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; said crystal connected between the gate of the first transistor and the ground; and wherein said first and second transistors are depletion mode field-effect transistors.
Claim 3
Dependent Claim
13 words
The oscillator of claim 1 wherein the third transistor is a field-effect transistor.
Claim 4
Dependent Claim
14 words
The oscillator of claim 2 wherein the third transistor is an enhancement mode transistor.
Claim 5
Dependent Claim
41 words
The oscillator of claim 1 including first and second capacitors connected in series between the gate of the first transistor and ground, with the interconnection of the first and second capacitors connected to the interconnection of the first and second transistors.
Claim 6
Dependent Claim
16 words
The oscillator of claim 2 wherein said fourth and fifth transistors are depletion mode field-effect transistors.
Claim 7
Dependent Claim
32 words
The oscillator of claim 2 wherein the source and drain terminals of the fourth transistor are connected together and wherein the source and drain terminals of the fifth transistor are connected together.
Claim 8
Dependent Claim
13 words
The oscillator of claim 1 wherein the second transistor has a grounded gate.
Claim 9
Dependent Claim
17 words
The oscillator of claim 5 wherein the high impedance voltage source includes a depletion mode field-effect transistor.
Claim 10
Dependent Claim
13 words
The oscillator of claim 1 with the crystal in a parallel resonance mode.
Claim 11
Dependent Claim
119 words
A one-pin oscillator circuit comprising a crystal operating in a parallel resonance mode; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; first and second capacitors interconnected in series between the gate of the first transistor and ground, with the interconnection of the first and second capacitors connected to the interconnection of the first and second transistors; said crystal connected between the gate of the first transistor and the ground; and wherein the first and second transistors are depletion mode field-effect transistors.
Claim 12
Dependent Claim
119 words
A one-pin oscillator circuit comprising a crystal operating in a parallel resonance mode; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; first and second capacitors interconnected in series between the gate of the first transistor and ground, with the interconnection of the first and second capacitors connected to the interconnection of the first and second transistors; said crystal connected between the gate of the first transistor and the ground; and wherein the first and second transistors are depletion mode field-effect transistors.
Claim 13
Dependent Claim
24 words
The oscillator of claim 10 including an oscillator output terminal provided in the connection between the crystal and the gate of the first transistor.
Claim 14
Dependent Claim
20 words
The oscillator of claim 10 including an oscillator output terminal provided in the connection between the first and second transistors.
Claim 15
Dependent Claim
21 words
The oscillator of claim 10 wherein the oscillator circuit with the exception of the crystal is integrated on a semiconductor substrate.
Claim 16
Dependent Claim
16 words
The oscillator of claim 4 wherein said fourth and fifth transistors are depletion mode field-effect transistors.
Claim 17
Dependent Claim
13 words
The oscillator of claim 10 wherein said second transistor has a grounded gate.
Claim 18
Dependent Claim
127 words
An oscillator circuit comprising: a crystal; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the first transistor grounded and the drain of the second transistor connected to a voltage source and with the drain of the first transistor connected to the source of the second transistor; said crystal connected between the gate of the first transistor and the ground wherein the high impedance voltage source includes a third transistor with the gate thereof grounded, the source thereof connected to the gate of the first transistor and the drain connected to a voltage source.
Claim 19
Dependent Claim
127 words
An oscillator circuit comprising: a crystal; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the first transistor grounded and the drain of the second transistor connected to a voltage source and with the drain of the first transistor connected to the source of the second transistor; said crystal connected between the gate of the first transistor and the ground wherein the high impedance voltage source includes a third transistor with the gate thereof grounded, the source thereof connected to the gate of the first transistor and the drain connected to a voltage source.
Claim 20
Dependent Claim
34 words
The oscillator of claim 16 including a first capacitor connected between the gate and the source of the first transistor and a second capacitor connected between the source of the first transistor and ground.
Claim 21
Dependent Claim
16 words
The oscillator of claim 16 wherein the first and second transistors are P-channel field effect transistors.
Claim 22
Dependent Claim
15 words
The oscillator of claim 1 wherein the first and second transistors are N-channel field-effect transistors.
Claim 23
Dependent Claim
98 words
An oscillator circuit comprising: a crystal; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; said crystal connected between the gate of the first transistor and the ground; and wherein said high impedance voltage source includes a third transistor with the gate and source thereof connected to a voltage source and the drain connected to the gate of the first transistor.
Claim 24
Dependent Claim
98 words
An oscillator circuit comprising: a crystal; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; said crystal connected between the gate of the first transistor and the ground; and wherein said high impedance voltage source includes a third transistor with the gate and source thereof connected to a voltage source and the drain connected to the gate of the first transistor.
Claim 25
Dependent Claim
90 words
An oscillator circuit comprising: a crystal; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; said crystal connected between the gate of the first transistor and the ground; wherein said first and second capacitors include the gate capacitance of fourth and fifth transistors, which transistors have the source and drain thereof tied together.
Claim 26
Dependent Claim
90 words
An oscillator circuit comprising: a crystal; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; said crystal connected between the gate of the first transistor and the ground; wherein said first and second capacitors include the gate capacitance of fourth and fifth transistors, which transistors have the source and drain thereof tied together.
Claim 27
Dependent Claim
150 words
A one-pin oscillator circuit comprising a crystal operating in a parallel resonance mode; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; first and second capacitors interconnected in series between the gate of the first transistor and ground, with the interconnection of the first and second capacitors connected to the interconnection of the first and second transistors; said crystal connected between the gate of the first transistor and the ground; and wherein said high impedance voltage source includes a third transistor with the gate and source thereof connected to a voltage source and the drain connected to the gate of the first transistor, wherein the third transistor includes an enhancement mode field-effect transistor.
Claim 28
Dependent Claim
150 words
A one-pin oscillator circuit comprising a crystal operating in a parallel resonance mode; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; first and second capacitors interconnected in series between the gate of the first transistor and ground, with the interconnection of the first and second capacitors connected to the interconnection of the first and second transistors; said crystal connected between the gate of the first transistor and the ground; and wherein said high impedance voltage source includes a third transistor with the gate and source thereof connected to a voltage source and the drain connected to the gate of the first transistor, wherein the third transistor includes an enhancement mode field-effect transistor.
Claim 29
Dependent Claim
132 words
A one-pin oscillator circuit comprising a crystal operating in a parallel resonance mode; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; first and second capacitors interconnected in series between the gate of the first transistor and ground, with the interconnection of the first and second capacitors connected to the interconnection of the first and second transistors; said crystal connected between the gate of the first transistor and the ground; wherein said first and second capacitors include the gate capacitance of fourth and fifth transistors which transistors have the source and drain thereof tied together.
Claim 30
Dependent Claim
132 words
A one-pin oscillator circuit comprising a crystal operating in a parallel resonance mode; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; first and second capacitors interconnected in series between the gate of the first transistor and ground, with the interconnection of the first and second capacitors connected to the interconnection of the first and second transistors; said crystal connected between the gate of the first transistor and the ground; wherein said first and second capacitors include the gate capacitance of fourth and fifth transistors which transistors have the source and drain thereof tied together.
Claim 31
Dependent Claim
84 words
An oscillator circuit comprising: a crystal; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; said crystal connected between the gate of the first transistor and the ground; and wherein the first transistor is an enhancement mode transistor and the second transistor is a depletion mode transistor.
Claim 32
Dependent Claim
84 words
An oscillator circuit comprising: a crystal; a first transistor forming an amplifier of the circuit; a second transistor interconnected in series with the first transistor forming a current source of the circuit; a high impedance voltage source biasing the gate of the first transistor with the source of the second transistor grounded; said crystal connected between the gate of the first transistor and the ground; and wherein the first transistor is an enhancement mode transistor and the second transistor is a depletion mode transistor.
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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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |