Method of curvature compensation, offset compensation, and capac

Details Method of curvature compensation, offset compensation, and capac Method of curvature compensation, offset compensation, and capac

1999-07-22

2000-05-09

Riley, Shawn

Electricity: power supply or regulation systems

Self-regulating

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

323907, G05F 316

Patent

active

060608749

ABSTRACT:
Curvature in a reference voltage produced by a switched capacitor band gap reference circuit is compensated by producing a first .DELTA.V.sub.BE voltage by causing first and second PTAT/R currents to flow through a first .DELTA.V.sub.BE -generating circuit. The first .DELTA.V.sub.BE voltage is applied to a first terminal of a first capacitor having a second terminal coupled to a summing conductor of an operational amplifier producing the reference voltage. A second .DELTA.V.sub.BE voltage is produced by causing a third PTAT/R current and a fourth current to flow through a second .DELTA.V.sub.BE -generating circuit. The second .DELTA.V.sub.BE voltage is applied to a first terminal or a second capacitor having a second terminal coupled to the summing conductor. First and second charges are transferred from the first and second capacitors through the summing conductor into a feedback capacitor coupled between the summing conductor and an output of the operational amplifier to produce the compensated reference voltage on the output of the operational amplifier. A technique of storing a voltage on the feedback capacitor equal to a V.sub.BE voltage minus a voltage on the summing conductor during a charging phase, and then connecting the feedback capacitor between the summing conductor and the output of the operational amplifier cancels the offset voltage of the amplifier.

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