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本文介绍一种在任一象限内实现对信号进行0～89°移相的数字移相电路,它在数据恢复系统中是非常有用的,在这样的系统中都要用同步解调器。与绝大多数RC移相器不同的是:其移相值与输入信号的频率无关。首先,将输入的基准信号fin引至14064锁相环,我们可使锁相环输出信号频率恰为fin的360倍。然后,再将此输出信号引至A_(2a),一个二一十进制计数器,对该信号进行十分频。与A_(2a)级联的A_(2b)对A_(2a)的输出又进行九分频。A_(2a)及A_(2b)这一个九十分频电路,当计数至
This paper presents a digital phase-shifting circuit that implements phase shifting of signals from 0 ° to 89 ° in either quadrant and is very useful in data recovery systems where a synchronous demodulator is used. Unlike most RC phase shifters, the phase shift value is independent of the frequency of the input signal. First of all, the input reference signal fin to 14064 PLL, we can make the PLL output signal frequency just fin 360 times. The output signal is then routed to A_ (2a), a two-decade counter, which decibels the signal. The A_ (2a) concatenation of A_ (2a) and the output of A_ (2a) are again divided by nine. A_ (2a) and A_ (2b) a ninety-frequency circuit, when counting up to