Second order low temperature coefficient bandgap voltage supply

Details Second order low temperature coefficient bandgap voltage supply Second order low temperature coefficient bandgap voltage supply

1993-06-16

1995-02-21

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

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

323907, 327539, 327541, G05F 330

Patent

active

053919807

ABSTRACT:
A voltage reference circuit (2) is provided which includes a 2nd order curvature correction circuit (3) that eliminates undesirable 2nd order polynomial temperature dependency characteristics. A bandgap reference circuit (Q4, Q3, Q2, Q1, R2 and R1) forms a bandgap current (I.sub.X) that is dependent upon absolute temperature. A translinear cell (Q15, Q14, Q13, Q12, Q11 and Q10) transforms this current in a squaring transformation and divides the squared current by a temperature independent current (I.sub.X). A current mirror (Q17 and Q16) adjusts the value of the squared current so that it approximates the value of the 2nd order term of the bandgap reference circuit.

REFERENCES:
patent: 3916180 (1975-10-01), Turtle
patent: 4497586 (1985-02-01), Nelson
patent: 4939442 (1990-07-01), Carvajal et al.
patent: 5053640 (1991-10-01), Yum

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