| 摘要 |
PURPOSE:To simplify the circuit constitution, by applying a comparison output between an output level of plural amplifiers and a reference level to plural counters and applying its output to a DA converter in time division for obtaining an automatic gain control signal of the amplifier. CONSTITUTION:An output of plural amplifiers AGCAMP is applied to a demodulating circuit DEM and also to a comparator COP. The comparison output is applied to a reversible counter CNT and its output is transmitted to a holding circuit INT in time division via a multiplexer MPX, a DA converter D/A and a distributor DMPX. Further, the gain of the amplifier AGCAMP is adjusted with outputs A-N. Since the DA converter is used in common, the circuit constitution is simplified. |
