Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1993-04-30
1995-06-13
Sterrett, Jeffrey L.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323907, G05F 316
Patent
active
054246288
ABSTRACT:
A bandgap reference circuit (14) in a bandgap voltage reference device (10) generates a bandgap voltage reference (V.sub.BG) at the base of a Q1 transistor (22) and a Q2 transistor (20). A reference current signal I.sub.T flows into the collectors of the Q2 transistor (20) and the Q1 transistor (22) as generated by a difference in base to emitter voltages due to a difference in emitter areas between the Q2 transistor (20) and the Q1 transistor (22). A correction current signal (I.sub.TT) generated by a current squaring circuit (16) is injected into the collector of the Q1 transistor (22) such that the collectors of the Q2 transistor (20) and the Q1 transistor (22) have unequal current values. The current squaring circuitry (16) generates the correction current signal (I.sub.TT) by squaring the reference current signal (I.sub.T) and dividing it into a sampling current signal (I.sub.SC ) generated in a current generator amplifier (18). The collector current difference between the Q2 transistor (20) and the Q1 transistor (22) enable the elimination of the second order temperature coefficient, as well as the first order temperature coefficient, of the base to emitter voltage (V.sub.BE) Of the Q1 transistor (22). In this manner, a bandgap voltage reference (V.sub.BG) becomes more stable, accurate, and less temperature dependent.
REFERENCES:
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patent: 5352973 (1994-10-01), Audy
A. Paul Brokaw, A Simple Three-Terminal IC Bandgap Reference, IEEE Journal of Solid-State Circuits, vol. SC-9, No. 6, Dec. 1974, pp. 388-393.
Klaas Bult and Hans Wallinga, A Class of Analog CMOS Circuits Based on the Square-Law Characteristic of an MOS Transistor in Saturation, IEEE Journal of Solid-State Circuits, vol. SC-22, No. 3, Jun. 1987, pp. 357-365.
Brady III W. James
Donaldson Richard L.
Sterrett Jeffrey L.
Texas Instruments Incorporated
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