US4873499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast rise pulse oscillator
Assignee: United States Department of the Army
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Filing: 1988-05-26
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Granted: 1989-10-10
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Expires: 2008-05-26
Abstract
Abstract A circuit and method of operation thereof for initiating a fast rise pulsescillator in a projectile fuzing system is less susceptible to external counter measures. The oscillator circuit includes an oscillator transistor which has a step recovery diode connected to the base of the transistor. The step recovery diode is forward biased for storing charge therein and then reverse biased thereby producing an internal transient in a tank circuit, also connected to the base of the transistor, which produces a rapid buildup of oscillations.
Inventors
- 👤 Marshall M. Algor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:07
CPC Classifications
H; H03; H03L; H03L3/00; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1231; H03C; H03C1/00; H03C1/36; H03B2200/00; H03B2200/006; H03B2200/0094
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
An oscillator for producing an output having fast rise time oscillations comprising: an output terminal; a first power supply terminal; a second power supply terminal; an oscillator transistor having a collector connected to said first power supply terminal, an emitter connected to said output terminal, and a base; a step recovery diode connected to the base of said oscillator transistor; a tank circuit connected between said second power supply terminal and the base of said oscillator transistor; first network biasing means connected to said first power supply terminal for effectuating a forward bias current through said step recovery diode; second network biasing means connected to said step recovery diode for reverse biasing said step recovery diode to produce a momentary reverse current that causes an internal transient in said tank circuit immediately prior to initiation of oscillations.
Claim 2
Dependent Claim
137 words
An oscillator for producing an output having fast rise time oscillations comprising: an output terminal; a first power supply terminal; a second power supply terminal; an oscillator transistor having a collector connected to said first power supply terminal, an emitter connected to said output terminal, and a base; a step recovery diode connected to the base of said oscillator transistor; a tank circuit connected between said second power supply terminal and the base of said oscillator transistor; first network biasing means connected to said first power supply terminal for effectuating a forward bias current through said step recovery diode; second network biasing means connected to said step recovery diode for reverse biasing said step recovery diode to produce a momentary reverse current that causes an internal transient in said tank circuit immediately prior to initiation of oscillations.
Claim 3
Dependent Claim
16 words
An oscillator according to claim 1 wherein said first network biasing means comprises: first resistive means.
Claim 4
Dependent Claim
52 words
An oscillator according to claim 2 wherein said second network biasing means comprises; second resistive means connected to said first supply voltage terminal; switch means connected in series between said second resistive means and said second supply terminal; and capacitive means connected between said step recovery diode and said second resistive means.
Claim 5
Dependent Claim
15 words
An oscillator according to claim 3 wherein said switch means comprises: a field effect transistor.
Claim 6
Dependent Claim
23 words
An oscillator according to claim 1 further comprising: capactive means connected between an emitter of said oscillator transistor and said second supply terminal.
Claim 7
Dependent Claim
34 words
An oscillator according to claim 1 wherein said step recovery diode has a cathode connected to the base of said oscillator transistor and an anode connected to said first and second network biasing means.
Claim 8
Dependent Claim
32 words
An oscillator according to claim 2 wherein said reverse biasing means comprises: a third supply voltage terminal; and switch means connected between said step recovery diode and said third supply voltage terminal.
Claim 9
Dependent Claim
14 words
An oscillator according to claim 7 wherein said switch means comprises a bipolar transistor.
Claim 10
Independent Claim
84 words
A method of rapidly initiating oscillations in an oscillator, including a transistor having a base, with a step recovery diode having its anode electrically connected to the base of said transistor and a tank circuit electrically connected to the base of said transistor which comprises the steps of: forward biasing said step recovery diode to store charge therein; and reverse biasing said step recovery diode thereby producing an internal transient in said tank circuit which produces a rapid buildup of oscillations in said oscillator.
Claim 11
Independent Claim
84 words
A method of rapidly initiating oscillations in an oscillator, including a transistor having a base, with a step recovery diode having its anode electrically connected to the base of said transistor and a tank circuit electrically connected to the base of said transistor which comprises the steps of: forward biasing said step recovery diode to store charge therein; and reverse biasing said step recovery diode thereby producing an internal transient in said tank circuit which produces a rapid buildup of oscillations in said oscillator.
References Cited (Backward Citations)
US3849741A
Cited
US4683446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |