Bandgap reference circuit, voltage generator, and voltage control method

Abstract

The invention discloses a bandgap reference circuit which includes a voltage generation circuit, a capacitor and a clamping control circuit. The voltage generation circuit is used to generate a current on an operation terminal. The capacitor includes a first terminal coupled to the operation terminal, and a second terminal coupled to a first reference voltage terminal. The clamping control circuitis coupled between the operation terminal and a second reference voltage terminal. The clamping control circuit includes a switch and a clamping unit, and is used to allow part of the current flowingthrough the clamping unit to the second reference voltage terminal when the switch is turned on.

Description

technical field [0001] The invention relates to a bandgap reference circuit, in particular to a bandgap reference circuit which includes a clamping unit and can improve the rate of supplying a predetermined voltage. Background technique [0002] In the current field of circuit design, a bandgap reference (Bandgap Reference) circuit is a commonly used predetermined voltage supply circuit, and its advantages include low power consumption and stable output voltage. A common bandgap reference circuit adjusts the cross-voltage of its internal transistor junction and the cross-current of its internal impedance, so that the predetermined voltage it provides is less susceptible to temperature changes. Therefore, the bandgap reference circuit can be used as a voltage supply source for the voltage stabilizing circuit. [0003] However, the predetermined voltage provided by the current bandgap reference circuit usually requires a long waiting time before reaching the predetermined val...

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Problems solved by technology

In addition, in order to consider the power saving factor, the bandgap reference circuit is often designed with low leakage current, resulting in a lower operating current

Therefore, the larger resistance-capacitance circuit and the low operating current make the predetermined voltage provided by the output terminal of the bandgap reference circuit often need too long waiting time before reaching the predetermined value by charging the resistance-capacitance circuit , the above-mentioned waiting time is too long, which is actually an unsolved problem in this field

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