| 摘要 |
PURPOSE:To reduce the circuit scale by providing a DC level setting circuit on plural signal paths whose gain characteristics are different from each other, respectively, and controlling each DC level setting circuit in accordance with a comparison output of a DC level of a signal passing through one signal path and a reference level. CONSTITUTION:DC level setting circuits 4A, 4B are provided on plural signal paths S1 and S2 whose gain characteristics are different from each other, respectively, a DC level of a signal passing through the signal paths S1, S2 and a reference level are compared by a comparator 6, and in accordance with an output of the comparator 6, each DC level setting circuit 4A, 4B is controlled. In such a way, since control currents of the clamp level setting circuits 4A, 4B of plural signal paths S1, S2 can be formed by one comparator, the circuit scale can be reduced. |
