Voltage down converter for low voltage operation

Details Voltage down converter for low voltage operation Voltage down converter for low voltage operation

2005-03-01

2005-03-01

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Interface

C326S063000, C326S068000, C327S333000

Reexamination Certificate

active

06861872

ABSTRACT:
A voltage down converter for a semiconductor memory device to convert an external voltage to a lower value internal voltage for the device, has a voltage generator that produces a reference voltage corresponding to the value of the internal voltage, a comparator having opposite polarity inputs for producing an amplified output control signal, and a pull-up device operating from the external voltage that receives the control signal from the comparator to produce the internal voltage as an input. A dual source follower is located between the reference voltage generator and comparator and has two sections having cross-coupled inputs which respectively receive the internal reference voltage and the internal voltage to produce output voltages moving in opposite directions, each of which is applied to one input of the comparator, thereby translating the difference between Vintref and Vint to a level in a range that can be better amplified by the comparator.

REFERENCES:
patent: 5532618 (1996-07-01), Hardee et al.
patent: 6617878 (2003-09-01), Brownlow et al.

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