Voltage controlled oscillator
First Claim
Patent Images
1. A voltage controlled oscillator circuit comprising:
- a. a phase shifting element having a signal input terminal and a signal output terminal and having a predetermined signal phase shift between said input and said output terminals,b. a signal feedback network having an output signal terminal and having an input terminal coupled to said output terminal of said phase shifting element to form said oscillator circuit, andc. adjustable voltage control means coupled between said output terminal of said feedback network and said input terminal of said phase shifting element and between said output terminal of said feedback network and said output terminal of said phase shifting element for varying the phase shift of said signal at said output terminal of said phase shifting element over a predetermined frequency range to cause said circuit to oscillate at any predetermined frequency within said predetermined frequency range.
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Abstract
A voltage controlled oscillator circuit having an amplifier coupled in series with a feedback circuit and having adjustable voltage means coupled to the phase shifting element means for varying the phase shift of the phase shifting element output signal thereby varying the frequency of oscillation of the oscillator circuit.
16 Citations
22 Claims
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1. A voltage controlled oscillator circuit comprising:
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a. a phase shifting element having a signal input terminal and a signal output terminal and having a predetermined signal phase shift between said input and said output terminals, b. a signal feedback network having an output signal terminal and having an input terminal coupled to said output terminal of said phase shifting element to form said oscillator circuit, and c. adjustable voltage control means coupled between said output terminal of said feedback network and said input terminal of said phase shifting element and between said output terminal of said feedback network and said output terminal of said phase shifting element for varying the phase shift of said signal at said output terminal of said phase shifting element over a predetermined frequency range to cause said circuit to oscillate at any predetermined frequency within said predetermined frequency range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of forming a voltage controlled oscillator circuit comprising the steps of:
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a. forming a phase shifting element having a signal input terminal and a signal output terminal and having a predetermined signal phase shift between said input and said output terminals, b. forming a signal feedback network having an output signal terminal and having an input signal terminal coupled to said output terminal of said phase shifting element to form said oscillator circuit, and c. coupling adjustable voltage control means between said output terminal of said feedback network and said input terminal of said phase shifting element and between said output terminal of said feedback network and said output terminal of said phase shifting element for varying the phase shift of said signal at said output terminal of said phase shifting element over a predetermined frequency range to cause said circuit to oscillate at any predetermined frequency within said predetermined frequency range. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification