| 摘要 |
PURPOSE:To secure an easy coupling between the digital and analog circuit without giving the evil effect to the operation of the alanog circuit and with facilitated monolithic formation by forming the output step of the digital circuit with the tristate burrer. CONSTITUTION:The output signals of digital circuit 1 are supplied to NAND circuit 2 which is gate-controlled by the control signal supplied via inverter circuit 4 as well as to NOR circuit 3 which is controlled by the control signal inverted again via inverter circuit 5. The output of circuit 2 and 3 are supplied to the tristate buffer composed of vertically connected complementary transistor (C-MOS) 6 and 7, and the output is supplied to analog circuit 8. Then both transistors 6 and 7 receive the OFF control by the control signal to cut off the signal transmission from circuit 1 to 8. |
