Input circuit for processing small amplitude input signals

Details Input circuit for processing small amplitude input signals Input circuit for processing small amplitude input signals

1993-08-11

1997-04-01

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 97, 327328, 327374, 327333, 326 17, 326 68, H03K 190185, H03K 19017

Patent

active

056170459

ABSTRACT:
There is disclosed an input circuit for a semiconductor integrated circuit device wherein a level shift circuit (LS1) adds a constant voltage to an input signal from an input signal terminal (3) and a reference voltage from a reference voltage terminal (4) to output signals, which are in turn amplified by means of a plurality of cascaded, first and second differential amplifier circuits (Dif1, Dif2), and then a difference between the amplified input signal and the amplified reference voltage is applied to a CMOS inverter circuit (In1), which in turn outputs a power supply potential (V.sub.DD) or a ground potential (V.sub.SS) in accordance with the difference, thereby achieving a high-speed operation in response to the binary input signal slightly varying in signal voltage and a normal operation independent of variation of the reference voltage. (FIG. 1 )

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