PURPOSE: To contrive to stabilize the performance while decreasing the number of gates of the entire system by using a switch circuit so as to make circuits to be employed together in use in common even in the circuit system with different signal processing.
CONSTITUTION: Switch circuit 14, 15 and 18 are added. An output of the switch 14 is supplied to a 1st series circuit 12' as the input, and its output is supplied to an input (a) of a switch 4 controlled by a signal fed to a control terminal 5 and an input (a) of the switch 18 controlled by a signal fed to a control terminal 8. Moreover, the output the switch 15 is fed to a 1st series circuit 12" as the input and its output is fed to an input (b) of the switch 4 and an input (b) of the switch 18. The output of the switch 18 is supplied to a 2nd series circuit 13 and the output of the 2nd series circuit is fed to a terminal 20. Thus, the 1st series circuit 12" on the signal line of a signal B is used in common with the 1st series circuit 12' of the signal line of a signal A in common and the number of gates is reduced.
FUJITA MASAAKI
OKUMURA NAOJI
