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US 4,904,964 AGranted
Voltage control oscillator with modulation compensation
AssigneeMotorola, Inc.
InventorsKwan K. Peng, Leng H. Ooi
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Abstract
An improved voltage controlled oscillator (VCO) is provided whereby the control voltage is utilized for modulation compensation by a modulation compensation network (90). The modulating signal is variably coupled into the voltage controlled oscillator (70) to compensate for the variation in the VCO's gain factor to yield a constant modulation level over a frequency band.
Claims8
A compensated voltage controlled oscillator having a substantially constant modulation levl, comprising:
- a voltage controlled oscillator (VOC) having a compensated modulation input and an adaptive input for receiving an adaptive signal;
- and
- compensation means including a modulation input for receiving a modulating signal and capacitance means having a variable capacitance for coupling said modulating signal to said compensated modulation input of said VCO, said compensation means including a control input for receiving an unadjusted control signal, said capacitance means varying its capacitance in response to said unadjusted control signal for providing a compensated modulated signal to said compensated input of said VCO.
Dependencies are inferred from the claim text.