| 摘要 |
PROBLEM TO BE SOLVED: To provide the matched filter executing refreshing for an entire circuit while ensuring an arithmetic speed. SOLUTION: The matched filter is provided with plural auxiliary sample-and- hold circuits SHs able to hold part of analog input voltages to be held by a main sample-and-hold circuit SHm, an adder/subtractor circuit ADD, 2nd adder/ subtractor circuits consisting of circuits equivalent to the adder/subtractor circuit ADD, and a multiplexer MUX1 providing an output of any of the adder/ subtractor circuit or the 2nd adder/subtractor circuits alternatively in addition. Thus, a period to halt any sample-and-hold circuit in the main sample-and-hold circuit SHm and the adder/subtractor circuit is provided to execute refreshment for this period. |
