| 摘要 |
PROBLEM TO BE SOLVED: To adapt the circuit to both a burst and a continuous signals, to obtain high reception sensitivity for the continuous signal, and to make the circuit small in size and low in cost by making it possible to adjust the offset compensation time constant of a limiter amplifier. SOLUTION: This circuit has series-connected limiter amplifiers 10-1 to 10-m with offset compensating functions and offset compensation time constant adjusting circuits (OCT) 20-1 to 20-n which are connected to respective limiter circuits and adjust the respective offset compensating functions. Then the OCTs 20-1 to 20-n have control terminals CONT(1) to CONT(n) respectively. According to control signals to the control terminals, respective offset compensation time constants of the limiter amplifiers 10-1 to 10-n are varied. For example, the respective offset compensation time constants of the limiter amplifiers are made small for burst signals and set large for continuous signals to perform high-precision offset compensation. |
