Input logic signal buffer circuits

Electronic digital logic circuitry – Function of and – or – nand – nor – or not – Field-effect transistor

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Details

326 17, 326 86, 326121, H03K 190175

Patent

active

057105162

ABSTRACT:
An input logic signal buffer circuit includes a differential amplifier which is responsive to an input logic signal and to a reference signal, to produce an output logic signal at an output node thereof. The input logic signal buffer circuit also includes a bypass amplifier which is electrically connected between the output logic signal and the output node. The bypass amplifier supplies additional current to the output node in response to logic level transitions of the input logic signal. The bypass amplifier preferably is a field effect transistor, the gate of which is electrically connected to the input logic signal and the source and drain of which are serially connected between the output node and a current limiting resistor. Logic level transitions with reduced delays, particularly at low power supply voltages, are thereby provided.

REFERENCES:
patent: 5408146 (1995-04-01), Nguyen et al.
patent: 5440248 (1995-08-01), Brown et al.
patent: 5444396 (1995-08-01), Soneda

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