Voltage controlled oscillator having approximately constant...

Details Voltage controlled oscillator having approximately constant... Voltage controlled oscillator having approximately constant...

H - Electricity

03

B

331/64

H03B 5/12 (2006.01) H03C 3/06 (2006.01) H03C 3/09 (2006.01)

Patent

CA 1205151

IMPROVED VOLTAGE CONTROLLED OSCILLATOR ABSTRACT OF THE DISCLOSURE A voltage controlled oscillator for use in a phase locked loop is provided with a first varactor circuit that responds to a control signal to set the center frequency of the oscillator, and with a second varactor circuit comprising a modulation varactor that responds to a modulation signal to cause the oscillator to produce a modulated output. The modulation sensitivity of the oscillator is made relatively constant between upper and lower center frequencies by applying a portion of the modulation signal to the first varactor circuit in addition to the control signal.

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