具有窄带跟踪环性能的数字解调器

Digital Demodulator Characterized by Narrow-band Tracking Loop

本文提出一种新的设计窄带跟踪环的方法,由此设计的窄带跟踪环路解调器,电路简单,等效带宽较窄,用它解调FSK信号,传输可靠性高。

A narrow-band tracking phase-locked loop is proposed. Its noise band is designed to be very narrow and the desired amplitude of demodu lator output is the same as that in the wide-band loop while the noise of demodulator output is much lower. Therefore the output signal-to-noise ratio of the demodulator and the communication reliability of the system are greatly improved. The demodulator proposed is simple in circuit configuration and high in transmission rate.