Rail-to-rail source followers

Details Rail-to-rail source followers Rail-to-rail source followers

2007-04-24

2007-04-24

Tran, Anh Q. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Signal level or switching threshold stabilization

C326S034000, C326S026000, C326S027000

Reexamination Certificate

active

11142176

ABSTRACT:
Circuits and methods are provided for producing a rail-to-rail output voltage. A circuit includes a level shifter, a source follower, and a current compensation circuit. The level shifter receives an input signal and applies a compensation voltage to the input signal relative to a voltage level of the input signal in steady-state. The source follower produces an output signal and, responsive to variations in the voltage level of the input signal, changes the voltage level of the output signal using a biasing current. The current compensation circuit, responsive to a difference between the voltage levels of the input and output signals, varies an amount of the biasing current.

REFERENCES:
patent: 5917378 (1999-06-01), Juang
patent: 6624669 (2003-09-01), Tsuchi

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