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调制器中一个非常重要的参数是载波的可变性,LMX2332是美国国家半导体公司生产的集成数字锁相环(PLL)电路。利用单片机AT89C2051控制数字锁相环LMX2332及压控振荡器JTOS-150实现低噪声频率源的方法,改变AT89C2051的程序得到不同频率的载波信号,可非常方便的改变信号的传输频段,增强通信设备的灵活性。
One of the most important parameters in the modulator is carrier variability. The LMX2332 is an integrated digital phase-locked loop (PLL) circuit from National Semiconductor. The use of single-chip microcomputer AT89C2051 control digital phase-locked loop LMX2332 and voltage-controlled oscillator JTOS-150 to achieve low-noise frequency source method, change AT89C2051 program to get different frequency carrier signal can be very convenient to change the signal transmission band, enhance communications equipment flexibility.