Switched capacitor temperature independent bandgap reference

Details Switched capacitor temperature independent bandgap reference Switched capacitor temperature independent bandgap reference

H - Electricity

03

K

328/193, 323/9

H03K 17/60 (2006.01) G05F 3/30 (2006.01)

Patent

CA 1178338

ABSTRACT A temperature stable bandgap voltage reference source utilizing two substrate bipolar transistors biased at different emitter current densities is provided. Switched capacitors are used to input the Vbe and the .DELTA.Vbe of the transistors (NTC and PTC voltages, respectively) into an amplifier to provide a reference voltage VREF proportional to the weighted sum of the PTC and NTC voltages. Proper selection of the ratio of the switched capacitors renders the reference voltage VREF substantially independent of temperature. In a modified form of the reference, the reference amplifier is implemented by an auto-zeroed operational amplifier which uses switched capacitor techniques and an integrated capacitor to achieve the auto-zeroing function.

393948

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