Wideband modulation sensitivity compensated voltage controlled oscillator
AssigneeMotorola, Inc.
InventorsTerrance J. Goedken, James K. Gehrke
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Abstract
A wideband, modulation sensitivity compensated, voltage controlled oscillator which automatically and continuously compensates over a wide bandwidth for modulation sensitivity variations resulting from changes in the center frequency of oscillation. The invention includes a compensation network which continuously varies the coupling between the modulation circuit and the oscillator tank circuit in response to changes in the steering control signal applied to a steering network. Continuous modulation sensitivity compensation is thereby provided over a wide bandwidth.
Claims4
An improved wideband, modulation sensitivity compensated voltage, controlled oscillator, comprising:
- oscillator means, having an input and an output, for providing an RF frequency sinal at the output;
- steering means, having a control input and coupled to the oscillator means, for providing high sensitivity control of the frequency of the output signal of the oscillator means in response to a signal applied to the control input thereof, said steering means comprising a first pair of series connected varactor diodes in parallel with a second pair of series connected varactor diodes, said varactor diodes having a common cathode coupled to the steering means control input, and further comprising linearizing inductors coupled to said steering means varactor diodes and configured such that the anode of each diode is coupled to ground through a linearizing inductor;
- modulation means, having a control input, for providing low sensitivity control of the frequency of the output signal of the oscillator means in response to a signal applied to the control input thereof;
- compensation means, coupled to the modulation means, the steering means, and the oscillator means, for compensating the sensitivity of the modulation means in response to the signal applied to the steering means control input.
Dependencies are inferred from the claim text.