Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

H - Electricity

04

B

325/18, 325/20,

H04B 1/40 (2006.01) H03C 3/09 (2006.01)

Patent

CA 1194932

ABSTRACT In a conventional frequency synthesizer used for a frequency modulation trans- ceiver, a reference oscillator feeds a reception oscillator and a transmission oscillator, each of which has a phase locked loop (PLL). Each PLL includes a voltage controller oscillator (VCO), variable frequency divider, phase com- parator and low pass filter. The dividing ratio of each frequency divider is varied with a channel designation signal and a modulating signal is applied to the VCO of the transmission oscillator together with a control voltage representative of the frequency difference between the VCO output and the reference oscillation. To overcome instability inherent in this system the invention takes a portion of the modulated carrier wave demodulates it and adds it to the modulating signal in reverse phase to achieve negative feedback.

412260

Affiliated with

Also associated with

Rating

Frequency synthesizer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency synthesizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency synthesizer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1313888