Dual-Phase Hysteresis Logic Circuit
Original Publication Date: 1988-Sep-01
Included in the Prior Art Database: 2005-Feb-15
Fig. 1 shows a half current switch emitter follower (HCSEF) circuit, which is a bipolar logic circuit having a low speed times power product and low complexity. Compared to a conventional full current switch emitter follower (CSEF), HCSEF circuits operate with a single low voltage power supply, use no references and do not maintain a constant current source. Hence, although it does not typically achieve the highest speeds of which the CSEF is capable, the HCSEF circuit is quite useful in applications requiring low power, high density and fairly good performance. (Image Omitted) One disadvantage of the HCSEF circuit is its single polarity output. It generates only a NOR output. Like TTL and DTL circuits, an inverter circuit must be used to generate the opposite polarity of a signal.