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现已研制出一种频率范围为20Hz至100KHz、具有稳定余弦响应、由四个二极管组成的桥式鉴相器。它是工作于此频率范围的实验锁相滤波器的组成部分之一。由六个晶体管的电路激励这个二极管电桥。不是采用常见的带有中心抽头的变压器,而是由宽带电阻性T型相加网络将信号和参考输入馈到电桥。输出是对地平衡的;输出电路的输入阻抗是600,000Ω。电源电压为50伏时,总的功耗是135毫瓦。所作的分析表明,输出端的余弦响应是:当π为奇数时E_(out)=-1.28E_s(cosπa)/ππ;当π为偶数时Eout=0这里E_s为信号输入有效值,α是输入参考电压的信号频率对参考频率的整数比。在信号电平为1伏和参考电平为5伏的情况下,典型的最大余弦响应是450毫伏。在整个30Hz至100KHz工作范围内,任意两条余弦曲线之间测得的最大变化不超过20毫伏。在0℃到50℃的温度范围内,在50KHz频率上测得的余弦曲线的变化不超过20毫伏。
Has developed a frequency range of 20Hz to 100KHz, with a stable cosine response, composed of four diodes bridge phase detector. It is part of an experimental phase-locked filter operating in this frequency range. This diode bridge is excited by a six-transistor circuit. Rather than using the common transformer with a center tap, the signal and reference inputs are fed to the bridge by a broadband resistive T-sum network. The output is ground balanced; the input impedance of the output circuit is 600,000Ω. When the supply voltage is 50 V, the total power dissipation is 135 milliwatts. The analysis shows that the cosine response at the output is: E out = - 1.28E_s (cosπa) / ππ when π is odd; Eout = 0 when π is even where E_s is the signal input rms and a is the input reference The integer ratio of the voltage signal frequency to the reference frequency. With a signal level of 1 volt and a reference level of 5 volts, the typical maximum cosine response is 450 millivolts. The maximum change measured between any two cosine curves does not exceed 20 millivolts over the entire 30Hz to 100KHz operating range. The cosine curve does not vary by more than 20 mV at a frequency of 50 kHz at a temperature in the range of 0 ° C to 50 ° C.