Wideband asynchronous phase shift keying modulation demodulation circuit for ultra low power using primary sideband filter aligned at 180 degrees phase

摘要

The BPSK demodulation circuit separates the modulated signal into a lower sideband and an upper sideband by a first order lowpass filter and a first order highpass filter whose cutoff frequency is a carrier frequency and outputs the carrier frequency 1 A sideband separation and lower sideband signal delay section for outputting an analog signal delayed by 1/4 period and an upper sideband analogue signal and a phase difference between the delayed lower sideband analog signal and the upper sideband analogue signal are Since it is aligned at 180 degrees, a signal generated by the sum of the analog signals, that is, data for demodulating the digital data by latching the analog pulse signal appearing in accordance with the phase change portion of the BPSK modulated signal by the hysteresis circuit A demodulator, a signal obtained by digitizing the delayed lower sideband analog signal by a comparator and a signal A data clock recovery section for generating a data clock by using the data signal.