Back to results
US 6,198,360 B1Granted
Quadrature current frequency modulation oscillator
AssigneeCypress Semiconductor Corporation
InventorW. S. Henrion
Life of this patent
Estimating the term…
Abstract
A circuit and method used in LC or ring oscillators. The present invention may modulate the frequency of oscillation by detecting a quadrature signal and controlling the sign and magnitude of the quadrature signal that may be feedback to the oscillator to cause the oscillator to run either faster or slower (dependent on the sign of the quadrature signal) than the unmodulated oscillator.
Claims20
A circuit comprising:
- an oscillator circuit configured to generate a first signal having a first frequency;
- a modulator circuit configured to modify said first frequency in response to a control signal;
- and
- a circuit configured to generate said control signal, wherein said control signal comprises a quadrature current.
1 more element
A method for modifying the frequency of oscillation of an oscillator comprising the steps of:
- (A) generating a periodic signal having a first frequency;
- (B) generating a control signal comprising a quadrature current;
- and
- (C) modifying said periodic signal in response to said control signal.
1 more element
A circuit comprising:
- an oscillator circuit configured to generate a first signal having a first frequency;
- a modulator circuit configured to modify said first frequency in response to a control signal;
- and
- a circuit configured to generate said control signal in response to a first control voltage and a second control voltage, wherein (i) said first frequency decreases when said first control voltage is greater than said second control voltage, (ii) said first frequency increases when said first control voltage is less than said second control voltage, and (iii) said first frequency remains unchanged when said first control voltage is equal to said second control voltage.
1 more element
Dependencies are inferred from the claim text.