The frequency deviation demodulator, the frequency modulation demodulator and the related mannered null band pass filter which internalize

摘要

PROBLEM TO BE SOLVED: To provide an FSK demodulator and an FM demodulator to solve problems caused by conventional technologies, and to provide related methods.;SOLUTION: An FSK demodulation circuit includes a BPF used as a phase shifter of the FSK demodulation circuit, which shifts the phase of an FSK signal and generates a phase shifted FSK signal, a phase comparator which has an automatic correction loop that is connected to the BPF and adjusts a center frequency of the BPF, a first input terminal that is connected to an output terminal of the BPF and a second input terminal that receives the FSK signal, and compares the received FSK signal with the phase shifted FSK signal in phase difference to output comparison results, and an analog/digital converter (ADC) which is connected to the phase comparator and converts the comparison results to digital data.;COPYRIGHT: (C)2007,JPO&INPIT