H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/15
H03D 3/00 (2006.01) H03G 3/20 (2006.01) H03J 7/02 (2006.01) H03D 7/16 (2006.01)
Patent
CA 1199377
Abstract of Disclosure A demodulator of the type employed in a "zero- IF" system uses a local oscillator for providing quadra- ture output signals at the center frequency of an FM sig- nal to be demodulated. The demodulator has first and second mixers for separately mixing the FM signal with the quadrature signals to provide a first and second out- put signal each in quadrature at the outputs of said mixers. These signals are low pass filtered. The demodulator in- cludes third and fourth mixers with each mixer receiving at an input one of the low pass signals. At another in- put the mixers receive third and fourth signals. The third and fourth signals are derived from mixing a variable controlled oscillator (VCO) signal with the local oscilla- tor quadrature signals. The outputs of the third and fourth mixers are applied to the inputs of a difference amplifiers, the output of which controls the frequency of the VCO in an automatic frequency control mode (AFC) to cause the output of the difference amplifier to provide demodulated signal. A switching means operates to alternate the third and fourth signals as applied to the input of the third and fourth means as well as the output as applied to the difference amplifier to cause an additional ampli- fier coupled to the outputs of the mixers to provide a DC control signal used for automatic gain control.
420077
International Standard Electric Corporation
Smart & Biggar
LandOfFree
Baseband demodulator for fm signals does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Baseband demodulator for fm signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Baseband demodulator for fm signals will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1285595