Patent ID: 6989710
Filing Date: 2006-01-24
Classification: H04L

Abstract:
1. A BFSK demodulator comprising a three-channel frequency-to-voltage converter; an information signal inputting the first-channel frequency-to-voltage converter; a converted information signal inputting the second-channel frequency-to-voltage converter, wherein outputs of first and second channel frequency-to-voltage converter are connected with a capacitor; a output voltage signal produced by the first and second frequency-to-voltage converters and the capacitor, inputting into a positive terminal of the comparator after high frequency noise filtering through a first low-pass filter; a carrier signal inputs into the third-channel frequency-to-voltage converter; and an output from the third-channel frequency-to-voltage converter connected to a capacitor; and a reference voltage signal is produced after high frequency noise filtering through a second low-pass filter, producing a demodulated signal after comparing the information voltage signal with the reference voltage.