| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC clamp circuit where the input conversion range of DC fluctuation, which is contained in an analog signal, is not narrowed even if the amplification rate of an analog signal is changed and the follow-up ability of a DC clamp is not changed at the time of A/D-converting an analog signal containing DC. SOLUTION: The circuit has an adder 1, a first amplification circuit 2, an A/D converter 3, a comparator 4, a D/A converter 5, a switch 6, an integrator 7 and a second amplification circuit 8. The first amplification circuit 2 and the second amplification circuit 8 can independently set an amplification rate by gain control values CONT 1 and CONT 2. At the time of setting the amplification rate of the first amplification circuit 2, the amplification rate of the second amplification circuit 8 can be set by depending on the amplification set rate.
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