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图1所示的二极管检波器是无线电电子设备的基本电路之一,广泛用于检取调幅信号的包络.电路中,时间常数(τ=RC)的选择对检波器的质量影响很大,τ值过小将使检波效率下降,高频干扰增大.τ值过大,则因输出电压U_o跟不上调幅信号包络
The diode detector shown in Figure 1 is one of the basic circuits of a radio electronic device and is widely used to detect the envelope of an amplitude modulated signal.In the circuit, the choice of a time constant (τ = RC) has a great influence on the quality of the detector, τ value is too small will reduce the detection efficiency, high-frequency interference increases. T value is too large, because the output voltage U_o can not keep up the AM signal envelope