Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1995-08-24
1997-09-09
Sterrett, Jeffrey L.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323316, 323907, G05F 316
Patent
active
056660464
ABSTRACT:
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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Dover Rennie William
Motorola Inc.
Sterrett Jeffrey L.
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