| 摘要 |
PURPOSE:To increase the drive capability with load by using NMOS and PMOS transistors (Trs), flowing only when an output level is switched substantially so as to obtain a four-value output without consuming power at no load. CONSTITUTION:The substrate of NMOS-Tr1, Tr3, Tr5 is connected to a low level Vss and the substrate of PMOS-Tr2, Tr4, Tr6 is connected to a high level Vcc. Since the Tr2 is turned on and the Tr1 is turned off when both inputs A, B are 0(Vss), the potential of the Tr5, Tr6 or the Tr2 is given to Y as an output. When the Tr6 is turned on and the Tr5 is turned off, then the Vcc level is outputted. With A=0, B=1, the Tr2 is turned on and the Tr1 is turned off, the Tr5 is turned on and the Tr6 is turned off, and the output Y is obtained with the Tr2 from the potential from the Vcc by the Vth-Nch where the threshold level is changed by the substrate effect by the Tr5. With A=1, B=0 the Vss level is lifted by the change of the threshold level similarly and it is fed to the output Y. With A=1, B=1, the Vss level is outputted to the output Y similarly. |
