Analog-to-digital converter and reference voltage circuitry

Details Analog-to-digital converter and reference voltage circuitry Analog-to-digital converter and reference voltage circuitry

1994-08-09

1995-11-28

Mullins, James B.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323907, 327539, G05F 320

Patent

active

054711312

ABSTRACT:
The analog to digital converter 300 has voltage reference circuitry 326 which includes a bandgap generator and a correction circuit 5300. The bandgap generator includes first and second NPN transistors 5211-5224, 5231-5232 of differing emitter areas and an operational amplifier 5202 with inputs sensing the collector current of the first and second NPN transistors 5211-5224, 5231-5232. First and second NPN transistors 5211-5224, 5231-5232 have their bases tied together. The output of the amplifier 5202 drives the bases of the NPN transistors 5211-5224, 5231-5232 through a resistor divider 5251-5253.

REFERENCES:
patent: 4443753 (1984-04-01), McGlinchey
patent: 4603291 (1986-07-01), Nelson
patent: 4633165 (1986-12-01), Pietkiewicz et al.
patent: 4634993 (1987-01-01), Koen
patent: 4939442 (1990-07-01), Carvajal et al.
patent: 5053640 (1991-10-01), Yum

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