US5341112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature stable oscillator circuit apparatus
Assignee: Boeing North American Inc
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Filing: 1993-06-09
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Granted: 1994-08-23
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Expires: 2013-06-09
Abstract
Abstract A stabilized oscillation circuit includes a bias circuit which controllably biases a bipolar-transistor-driven crystal oscillator circuit. The bipolar-transistor-driven crystal oscillator circuit is a modified version of a conventional transistor-driven oscillator, such as a Hartley, Pierce or Colpitts-type circuit. The bias circuit includes a first current providing a reference current through a Schottky diode and a pair of bipolar transistors. The bipolar-transistor-driven crystal oscillator circuit includes an input and an output, where the input of the bipolar-transistor-driven crystal oscillator circuit is coupled to the bias circuit. The bipolar-transistor-driven crystal oscillator circuit includes a second current through a second bipolar transistor. The second current tracks the reference current so that the output of the bipolar-transistor-driven oscillator circuit is substantially constant over variations in ambient temperature.
Inventors
- 👤 Leo J. Haman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:23
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03L; H03L1/00; H03L1/02; H03B2200/00; H03B2200/0002; H03B2200/0008; H03B2200/001; H03B2200/0012; H03B2200/003; H03B2200/0038; H03B5/02; H03B5/04; H03B5/362
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
A temperature stable oscillation circuit, comprising: a bias circuit having a first current output; a mirror circuit means having a second current output; a bipolar-transistor having it's base-emitter junction coupled to the bias circuit current output and the mirror circuit means output; and a crystal oscillator coupled to and serially disposed between the bipolar-transistor base and emitter terminal such that a driver current from the bipolar transistor to the crystal oscillator is temperature compensated by the mirror circuit means current output.
Claim 2
Dependent Claim
81 words
A temperature stable oscillation circuit, comprising: a bias circuit having a first current output; a mirror circuit means having a second current output; a bipolar-transistor having it's base-emitter junction coupled to the bias circuit current output and the mirror circuit means output; and a crystal oscillator coupled to and serially disposed between the bipolar-transistor base and emitter terminal such that a driver current from the bipolar transistor to the crystal oscillator is temperature compensated by the mirror circuit means current output.
Claim 3
Dependent Claim
21 words
A stabilized oscillation circuit, according to claim 1, wherein said bias circuit means reference current biases a pair of bipolar transistors.
Claim 4
Dependent Claim
34 words
A stabilized oscillation circuit, according to claim 2, wherein said bias circuit means includes a first resistor and said mirror circuit means includes a second resistor, said first and second resistors having equal resistances.
Claim 5
Dependent Claim
27 words
A stabilized oscillation circuit, according to claim 3, wherein said bias circuit means further includes a Schottky diode establishing a voltage drop in the first current path.
Claim 6
Dependent Claim
17 words
A stabilized oscillation circuit, according to claim 1, wherein said circuit is arranged as a Pierce oscillator.
Claim 7
Dependent Claim
17 words
A stabilized oscillation circuit, according to claim 1, wherein said circuit is arranged as a Colpitts oscillator.
Claim 8
Dependent Claim
76 words
A stabilized oscillation circuit, comprising: a bias circuit having a current path providing a reference current through a first pair of bipolar transistors; and a bipolar-transistor-driven crystal oscillator circuit comprised of a second pair of bipolar transistors, the bipolar-transistor-driven crystal oscillator circuit being coupled to the bias circuit and including a control current through a bipolar transistor, the control current tracking the reference current so that the output of the bipolar-transistor-driven oscillator circuit is substantially constant.
Claim 9
Dependent Claim
76 words
A stabilized oscillation circuit, comprising: a bias circuit having a current path providing a reference current through a first pair of bipolar transistors; and a bipolar-transistor-driven crystal oscillator circuit comprised of a second pair of bipolar transistors, the bipolar-transistor-driven crystal oscillator circuit being coupled to the bias circuit and including a control current through a bipolar transistor, the control current tracking the reference current so that the output of the bipolar-transistor-driven oscillator circuit is substantially constant.
Claim 10
Dependent Claim
29 words
A stabilized oscillation circuit, according to claim 7, wherein said bipolar-transistor-driven oscillator circuit includes a crystal oscillator and an NPN transistor having a collector coupled to the crystal oscillator.
Claim 11
Dependent Claim
31 words
A stabilized oscillation circuit, according to claim 7, further including a first resistor in the control current and second and third resistors respectively coupled to the first pair of bipolar transistors.
Claim 12
Dependent Claim
17 words
A stabilized oscillation circuit, according to claim 9, wherein the second and third resistors have equal resistances.
Claim 13
Dependent Claim
25 words
A stabilized oscillation circuit, according to claim 10, wherein the first resistor has a resistance equal to the resistance of the second and third resistors.
Claim 14
Dependent Claim
16 words
A stabilized oscillation circuit, according to claim 7, wherein the bias circuit includes a Schottky diode.
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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) | 1997-08-22 | 1998-02-21 | 1998-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-22 | 2002-02-21 | 2002-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-22 | 2006-02-21 | 2006-08-23 | $7700.00 | Window Closed / Lapsed |