| 摘要 |
PURPOSE:To prevent signal distortion and degradation of the dynamic range, by using a voltage, which is generated in the complementary relation to an AM detection output, as an AGC voltage in the synchronizing wave detector consisting of multipliers using two pairs of differential amplifiers. CONSTITUTION:An AM signal and a signal synchronized with the carrier wave of the AM signal are multiplied in transistors (TR)Q1-Q6. The multiplier functions as a current source which generates complementary currents to two pairs of differential amplifiers consisting of TRSQ7-Q10. The output of the TRQ10 is taken out by a resistance R3 and is smoothed in an AGC voltage generating circuit 1 and becomes a DC voltage EG. The DC voltage EG is applied to the TRQ8 connected complementarily to the TRQ7 from which the detection output is taken out, and the output of the TRQ7 is controlled. |
