US3566159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency multiplier circuit
Assignee: Thomas International Corp
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Filing: 1968-06-21
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Granted: 1971-02-23
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Expires: 1988-06-21
Abstract
Abstract A frequency multiplying circuit is provided which responds to input signals of a wide variety of frequencies and wave forms, to produce corresponding frequency multiplied outputs which are free of the fundamental subtone. The frequency multiplying circuit to be described includes a squaring amplifier which converts the individual inputs into corresponding square waves; and it also includes a phase splitter, differentiator and rectifier circuit coupled to the squaring amplifier to perform the frequency multiplying function.
Inventors
- 👤 Bradley J Plunkett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:48
CPC Classifications
H; H03; H03B; H03B19/00; H03B19/06; H03B19/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A frequency multiplier circuit responsive to input signals having a generally sinusoidal wave form, said frequency multiplier circuit including: first circuit means responsive to the aforesaid input signals for producing in response thereto corresponding square wave signals; bias control means coupled to said first circuit means and responsive to the duty cycle of said square wave signals to control said first circuit means so as to maintain a predetermined duty cycle in said square wave signals; and further circuit means coupled to said first circuit means and responsive to the square wave signals produced thereby for developing pulses having a repetition frequency which is a selected multiple of the frequency of said square wave signals.
Claim 2
Dependent Claim
115 words
A frequency multiplier circuit responsive to input signals having a generally sinusoidal wave form, said frequency multiplier circuit including: first circuit means responsive to the aforesaid input signals for producing in response thereto corresponding square wave signals; bias control means coupled to said first circuit means and responsive to the duty cycle of said square wave signals to control said first circuit means so as to maintain a predetermined duty cycle in said square wave signals; and further circuit means coupled to said first circuit means and responsive to the square wave signals produced thereby for developing pulses having a repetition frequency which is a selected multiple of the frequency of said square wave signals.
Claim 3
Dependent Claim
25 words
The frequency multiplier circuit defined in claim 1 in which said first circuit means includes a direct current feedback circuit constituting said bias control means.
Claim 4
Dependent Claim
19 words
The frequency multiplier circuit defined in claim 2 in which said feedback circuit includes an adjustable reference potential source.
Claim 5
Dependent Claim
39 words
The frequency multiplier circuit defined in claim 1 in which said further circuit includes a phase splitter circuit responsive to each said square wave signal from said first circuit means for producing two corresponding 180* out-of-phase square wave signals.
Claim 6
Dependent Claim
76 words
The frequency multiplier circuit defined in claim 4 in which said further circuit includes differentiating circuit means coupled to said phase-splitter circuit and responsive to said out-of-phase signals for producing corresponding series of positive and negative pulse signals; and rectifier means coupled to said differentiating circuit means and responsive to said series of pulses for producing a further series of pulses of a repetition frequency which is twice the frequency of the inDividual square wave signals.
Claim 7
Dependent Claim
71 words
An amplifier responsive to applied input signals having a generally sloping wave form for producing rectangular wave signals of any selected duty cycle, said amplifier including: bias control means coupled to the input of said amplifier; and feedback circuit means coupled to the output of said amplifier and to said bias control means for maintaining a predetermined duty cycle of said rectangular wave signals, by establishing the bias of said amplifier.
Claim 8
Dependent Claim
71 words
An amplifier responsive to applied input signals having a generally sloping wave form for producing rectangular wave signals of any selected duty cycle, said amplifier including: bias control means coupled to the input of said amplifier; and feedback circuit means coupled to the output of said amplifier and to said bias control means for maintaining a predetermined duty cycle of said rectangular wave signals, by establishing the bias of said amplifier.
Claim 9
Dependent Claim
29 words
The amplifier defined in claim 6 in which said feedback circuit includes an adjustable reference potential source for establishing the said predetermined duty cycle of said rectangular wave signals.
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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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |