FSK Demodulator, FM Demodulator, and Related Metho

专利名称：FSK Demodulator, FM Demodulator, and

Related Method with A Build-in Band-passFilter

发明人：Kwo-Wei Chang,Chun-Yi Li申请号：US11563689申请日：20061128

公开号：US20070217549A1公开日：20070920

专利附图：

摘要：A frequency shift keying (FSK) demodulator includes a band-pass filter, an auto-calibration loop, a phase comparator, and an analog-to-digital converter. The band-pass

filter is used for shifting phase of an FSK signal to generate a revised FSK signal. Theauto-calibration loop is coupled to the band-pass filter for adjusting a center frequencyof the band-pass filter. The first input end of the phase comparator is coupled to anoutput end of the band-pass filter, and the second input end of the phase comparator isused for receiving the FSK signal. The phase comparator is used for comparing the FSKsignal with the revised FSK signal and outputting a comparison result. The analog-to-digital converter is coupled to the phase comparator for converting the results of thephase comparator into digital data. Similarly, a frequency modulation (FM) demodulatorincludes a band-pass filter, an auto-calibration loop, and a phase comparator.

申请人：Kwo-Wei Chang,Chun-Yi Li

地址：Hsinchu County TW,Taipei City TW

国籍：TW,TW

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