Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-05-09
1997-04-08
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327538, 323313, G05F 110
Patent
active
056191634
ABSTRACT:
A bandgap voltage reference includes a series connection of a proportional-to-absolute-temperature (PTAT) voltage drop resistor with a V.sub.BE voltage drop transistor, such that a bandgap voltage V.sub.REF =V.sub.PTAT +V.sub.BE can be developed across the series connection. The bandgap voltage reference further includes a PTAT current generator having a pair of bipolar transistors which derive their base currents from a base current node between the PTAT voltage drop resistor and the V.sub.BE voltage drop transistor. The PTAT current developed by the PTAT current generator is compensated to counteract the effect of the base currents flowing through the PTAT voltage drop resistor. A method for developing a bandgap reference voltage includes the steps of: a) generating a PTAT current with at least two transistors supplied with a base current, wherein the PTAT current is compensated for the effect of the base current; and b) applying the PTAT current to a series connection of a PTAT voltage drop resistor with a bipolar V.sub.BE voltage drop transistor, such that a bandgap voltage V.sub.REF +V.sub.PTAT +V.sub.BE can be developed across the series connection as the PTAT current flows through the series connection. The base current for the pair of transistors is derived from a base current node located between the PTAT voltage drop resistor and the V.sub.BE voltage drop transistor.
REFERENCES:
patent: 3617859 (1971-11-01), Dobkin et al.
patent: 3887863 (1975-06-01), Brokaw
patent: 4249122 (1981-02-01), Widlar
patent: 5206581 (1993-04-01), Yoshida
patent: 5352973 (1994-10-01), Audy
Callahan Timothy P.
Kim Jung Ho
Maxim Integrated Products Inc.
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