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图1是一种能解调超低频信号的鉴频器,这种电路结构简单,使用在信号缓慢变化的场合,例如振动仪中。电路由电容器C_1、C_2、二极管D_1、三极管BG_1以及负载电阻R_1组成。其工作原理是,当A点加上+E值脉冲信号时,此信号经C_1、D_1、C_2充电。由于B点比C点电位高,所以BG_1,的eb结趋于反向偏置,BG_1截止。如果略去D_1的结压降,则+E脉冲电压由C_1与C_2分压,所以C点的电压是V_C=E·C_1/(C_1+C_2)。经过时间t后,输
Figure 1 is a demodulator can be ultra-low frequency signal frequency discriminator, this circuit structure is simple, used in slow changes in signal occasions, such as vibrator. The circuit consists of capacitors C_1, C_2, diode D_1, transistor BG_1 and load resistor R_1. The working principle is that when the A point + E pulse signal, the signal by C_1, D_1, C_2 charge. Since point B is higher than point C, the eb junction of BG_1 tends to reverse bias and BG_1 ends. If the junction voltage drop of D_1 is omitted, the voltage of + E pulse is divided by C_1 and C_2, so the voltage at point C is V_C = E · C_1 / (C_1 + C_2). After the time t, lose