论文部分内容阅读
本文所介绍的锁相鉴频器是为了解调超低频信号而设计的,它的主要性能如下: 1.副载波中心频率1千赫,频偏100赫; 2.信息信号带宽为1～20赫; 3.输入调频信号幅度5毫伏,输出低频信号幅度为5伏; 4.改变电位器W_1时相应地改变副载波中心频率,实现频分多路解调的目的. 这个电路共由四部分组成: 1.放大及整形电路:由晶体管BG_1～BG_4组成,用RC耦合,线路简单可靠,输入信号虽然是调频信号,但总是有寄生调幅或幅度干扰,通过放大整形电路之后,便形成矩形波序列.
The phase-locked frequency discriminator introduced in this paper is designed to demodulate the ultra-low frequency signal. Its main performances are as follows: 1. The center frequency of the subcarrier is 1 kHz and the frequency offset is 100 Hz. 2. The information signal bandwidth is 1 to 20 Hz; 3. Enter the FM signal amplitude of 5 millivolts, the output low-frequency signal amplitude of 5 volts; 4. Change the potentiometer W_1 corresponding sub-carrier center frequency to achieve the purpose of frequency division multiple demodulation.This circuit consists of four Part of the composition: 1. Amplification and shaping circuit: By the transistor BG_1 ~ BG_4 composition, with RC coupling, the circuit is simple and reliable, although the input signal is the FM signal, but there is always parasitic amplitude or amplitude interference, through the enlargement and shaping circuit, they formed Rectangular wave sequence.