| 摘要 |
PURPOSE:To reduce the degradation of the characteristics of an output signal, by providing a control signal switch and controlling a switcher by a control signal selected by the switch. CONSTITUTION:Plural input signals are supplied to input terminals 301, 302...n, and a specific input signal is supplied to an input terminal 401. A controlling circuit 7 performs the control so that signals of input terminals 301...n are selected, and these signals can be selected in a switcher 6 by the control signal. A controlling circuit 8 performs the control so that the signal of the input terminal 401 is selected, and this signal is selected in the switcher 6 by the control signal. These two control signals are supplied to a control signal switch 9, and the switcher 6 is controlled by the output control signal of the switch 9, and the output signal is sent to an output terminal 10. |
