Patent ID: 6879198
Filing Date: 2005-04-12
Classification: H03K

Abstract:
1. A differential receiver providing symmetrical hysteresis and comprising: a differential amplifier having a plurality of inputs and an output and comprising a plurality of input transistors, each input transistor having a control terminal and first and second conduction terminals, the first conduction terminals of said input transistors being connected together, and the control terminals of said input transistors each being connected to a respective one of the inputs of said differential amplifier; a plurality of buffers cascade-connected to the output of said differential amplifier; and a plurality of feedback transistors each having a control terminal and first and second conduction terminals, the first and second conduction terminals of each feedback transistor respectively being connected to the first and second conduction terminals of a respective input transistor of the plurality of input transistor to provide a parallel connection therebetween, and the control terminal of each feedback transistor being connected to the output of a respective buffer of the plurality of buffers; said feedback transistors providing positive feedback to cause switching at the output of said differential amplifier when a first input voltage at one of the input terminals of said differential amplifier increases above or decreases below a second input voltage at another one of the input terminals of said differential amplifier by a predetermined threshold.