US3775698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A circuit for generating a high power rf signal having low am and fm noise components
Assignee: Westinghouse Electric Corp
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Filing: 1972-08-04
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Granted: 1973-11-27
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Expires: 1992-08-04
Abstract
Abstract An RF signal generator is disclosed which has low AM and FM noise and high power output. The output signal of the RF signal generator is a variable over an octave in response to a tuning voltage signal. The RF signal generator includes a low noise RF oscillator coupled to a limiter circuit through a first buffer amplifier. A second buffer amplifies the output of the limiter circuit to produce a high level RF output signal. The FM noise is reduced to a low value by a high Q resonant circuit which determines the frequency of the oscillator and by the use of components in the oscillator circuit which have low noise characteristics. The AM noise is further reduced by the limiter and the output of the limiter is amplified by a second buffer to produce a high power low noise RF signal.
Inventors
- 👤 J Nugent
- 👤 H Claypool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:03
CPC Classifications
H; H03; H03L; H03L5/00; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1228; H03B5/1237; H03B5/124; H03B5/1243; H03B2200/00; H03B2200/003; H03B2200/004; H03B2201/00; H03B2201/02; H03B2201/0208
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
198 words
A low noise RF signal generator comprising, in combination: a. an active circuit comprising an insulated gate transistor having a gate terminal, a source terminal and a drain terminal, a bias network including a resistor and a hot carrier diode connected in parallel therewith, a load impendance, said bias network being coupled between said gate terminal of said insulated gate transistor and the ground terminal of said active circuit, said drain terminal being connected to a power supply, said load impedance being coupled between said source terminal of said insulated gate transistor and the ground terminal of said active circuit with the junction of said source terminal and said load impedance forming the output terminal of said active circuit; b. a parallel tuned circuit comprising an inductor and a capacitor connected in parallel, said tuned circuit being coupled to the gate terminal of said transistor and to the ground terminal of said active circuit; c. a feedback circuit coupling the output of said active circuit to the gate terminal of said transistor to form an oscillator circuit; and d. a limiter coupled to receive the output signal of said oscillator and generate therefrom a low noise RF signal.
Claim 2
Dependent Claim
198 words
A low noise RF signal generator comprising, in combination: a. an active circuit comprising an insulated gate transistor having a gate terminal, a source terminal and a drain terminal, a bias network including a resistor and a hot carrier diode connected in parallel therewith, a load impendance, said bias network being coupled between said gate terminal of said insulated gate transistor and the ground terminal of said active circuit, said drain terminal being connected to a power supply, said load impedance being coupled between said source terminal of said insulated gate transistor and the ground terminal of said active circuit with the junction of said source terminal and said load impedance forming the output terminal of said active circuit; b. a parallel tuned circuit comprising an inductor and a capacitor connected in parallel, said tuned circuit being coupled to the gate terminal of said transistor and to the ground terminal of said active circuit; c. a feedback circuit coupling the output of said active circuit to the gate terminal of said transistor to form an oscillator circuit; and d. a limiter coupled to receive the output signal of said oscillator and generate therefrom a low noise RF signal.
Claim 3
Dependent Claim
32 words
The RF signal generator of claim 1 wherein said parallel tuned circuit includes a voltage controlled capacitor permitting the frequency of said oscillator to be varied in response to a voltage signal.
Claim 4
Dependent Claim
18 words
The oscillator of claim 1 further including a buffer amplifier disposed between said active circuit and said limiter.
Claim 5
Dependent Claim
24 words
The oscillator of claim 3 wherein said buffer amplifier includes a gain control thereby permitting the input signal to said limiter to be adjusted.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |