论文部分内容阅读
鉴相器是锁相环路的重要部件之一。锁相环无论用于何种无线电设备,对 VCO 输出信号频谱纯度的要求是一项重要的技术指标。VCO 的频谱纯度除了跟自身的电路形式,工作状态有关以外,还与输入信号、环路参数,控制线上的杂散电平有关。为了滤除输入信号中的噪声,环路要用窄带宽,而要抑制 VCO 本身的噪声,则又要求环路带宽要宽;而且,环路带宽又受到其他技术指标的限制,所以环路对杂散的限制是有限的。因此,提高鉴相器对杂散的抑制能力,尽量压低 VCO 控制线上的杂散电平,是一项十分重要的事情。
Phase detector is one of the important components of the phase-locked loop. Phase Locked Loop Regardless of the type of radio equipment used, the requirement for spectral purity of the VCO output signal is an important technical indicator. VCO spectral purity in addition to its own circuit form, working conditions, but also with the input signal, the loop parameters, the control line stray level. In order to filter out the noise in the input signal, the loop needs to use a narrow bandwidth, but to suppress the noise of the VCO itself, the bandwidth of the loop needs to be wide. In addition, the loop bandwidth is limited by other technical specifications. Therefore, Stray restrictions are limited. Therefore, it is very important to improve the ability of the phase detector to suppress spurs and minimize the spurious levels on the VCO control line.