Low voltage input buffer for asymmetrical logic signals

Details Low voltage input buffer for asymmetrical logic signals Low voltage input buffer for asymmetrical logic signals

1996-12-19

1998-11-24

Le, Dinh

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327543, 327108, 327362, 326 68, 326 34, H03K 1716

Patent

active

058413090

ABSTRACT:
An input buffer circuit has a switching point accurately set according to the input logic level, even when the input buffer circuit has a low supply voltage. The switching point is set according to an internal reference voltage of equal magnitude to the desired switching point that is applied to a current source. The current source accurately sources (or sinks) a current matching the current flowing in an input inverter when the input logic level substantially equals the reference voltage. At that point, the voltage at the output of the input inverter is substantially equal one half of the supply voltage. When the input logic level is slightly below or above the reference voltage, the output of the input inverter is near the supply or ground rail, respectively. Hysteresis is added to compensate for noise that may exist on the input logic signal.

REFERENCES:
patent: 4713600 (1987-12-01), Tsugaru et al.
patent: 4763021 (1988-08-01), Stickel
patent: 4792704 (1988-12-01), Lobb et al.
patent: 5341045 (1994-08-01), Almulla
patent: 5341047 (1994-08-01), Rosenthal
patent: 5386153 (1995-01-01), Voss et al.
patent: 5467044 (1995-11-01), Ashe et al.

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