| 摘要 |
<p>A low power optional inverter uses P-channel and N-channel transistors in series as in a conventional CMOS inverter, but in one embodiment connects complementary signals to the sources of the P-channel and N-channel transistors. Therefore, when the complementary signals are switched the circuit switches between an inverting and a non-inverting buffer. In the non-inverting mode, there is negligible current drain upon switching because in this mode the circuit does not include a standard CMOS inverter, and there is no conducting path from power to ground when input voltage is in the range of 2 to 3 volts. In one embodiment, in the noninverting mode, at least one bypass transistor between the optional inverter input and output is turned on, and power is not supplied to the inverter. In yet another embodiment, in the inverting mode a CMOS inverter is powered with conventional voltages and in the noninverting mode the CMOS inverter is disabled and a bypass transistor connects input to output. <IMAGE></p> |
