CMOS Schmitt Trigger Buffer
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
The circuit discussed provides a low power, high performance CMOS buffer/driver which exhibits hysteresis and noise immunity characteristics. A dramatic gain in CMOS logic performance has been due in part to smaller stage-to-stage delays, reduced capacitive loading on terminal nodes and more versatility allowed by the CMOS technology. It is also true that noise in the signal may quickly penetrate deep into the logic design and the noise amplitude and duration is a larger percentage of the CMOS technology's shorter pulses. A CMOS circuit is shown in Fig. 1 which can be used as a buffer, receiver, predriver or sense amplifier. The circuit is effective against noise through the use of the Schmitt trigger hysteresis effect and can be tailored by the circuit designer.