Reference voltage circuit having a substantially zero temperature coefficient

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United States of America Patent

PATENT NO 5666046
SERIAL NO

08518768

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Abstract

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A method for generating a programmable bandgap output reference voltage (V.sub.REF31) and a voltage reference circuit (31) have been provided. The voltage reference circuit (31) includes a pair of bipolar transistors (33, 34), a resistor (36), an operational amplifier (32) and a plurality of field effect transistors (38, 39, 41) configured to generate a current (I.sub.1 ') having a positive temperature coefficient. In addition, the voltage reference circuit (31) includes a resistor (46), an operational amplifier (44), another plurality of field effect transistors (47, 48) which, in conjunction with one (34) of the pair of bipolar transistors, generates a current (I.sub.2 ') having a negative temperature coefficient. The current (I.sub.1 ') having the positive temperature coefficient is summed with the current (I.sub.2 ') having the negative temperature coefficient to form a current having a zero temperature coefficient, which is used to develop a voltage having a zero temperature coefficient.

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Patent Owner(s)

Patent OwnerAddress
TESSERA ADVANCED TECHNOLOGIES INC3025 ORCHARD PARKWAY SAN JOSE CA 95134

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Mietus, David F Phoenix, AZ 19 270

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