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Bandgap reference voltage generating circuit

A reference voltage and circuit generation technology, which is applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as unstable reference voltage and unstable output current of the current mirror, and achieve the effect of stabilizing the reference voltage

Inactive Publication Date: 2015-07-01
SILICON MOTION INC (CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when the bandgap reference voltage generation circuit includes a current mirror, the voltage change caused by the temperature change may not be evenly reflected on each current output terminal of the current mirror, which may make the output current of the current mirror unstable. And the associated instability of the reference voltage

Method used

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Examples

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Embodiment Construction

[0036] figure 1 A block diagram of a bandgap reference voltage generating circuit 100 according to an embodiment of the present invention is shown. like figure 1 As shown, the bandgap reference voltage generation circuit 100 includes a current mirror 101, a first operational amplifier OP 1 , an input voltage generation module 103, a voltage maintenance module 105 and a reference voltage impedance element R r . The current mirror 101 receives a first predetermined voltage V DD and at a first current output terminal T c1 produces a first current I 1 , at a second current output T c2 produces a second current I 2 , and at a third current output terminal T c3 produces a third current I 3 , where the second current I 2 Mapped from the first current I 1 , the third current I 3 Mapped from the first current I 1 or the second current I 2 . The first operational amplifier OP 1 Contains a first operation output terminal T O1 , a first operation input terminal T I1 and ...

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Abstract

A bandgap reference voltage generating circuit, comprising: a current mirror, for respectively generating a first, a second and a third currents at a first, a second and a third current output terminals; a first OP; an input voltage generating module, for respectively generating a first, a second voltages at a first, a second operational input terminals of the first OP according to the first, second currents, wherein the first OP generates a control voltage to the current mirror according to the first, second voltages; and a voltage keeping module, comprising a first current receiving terminal for receiving the third current to generate a third voltage, and a reference voltage generating terminal coupled to a reference voltage resistance device and for generating a reference voltage according to the third current. The voltage keeping module controls the third voltage to be the same as the first or the second voltage.

Description

technical field [0001] The invention relates to a bandgap reference voltage generation circuit, in particular to a bandgap reference voltage generation circuit which can make the voltages of the current output terminals of the current mirror in the bandgap reference voltage generation circuit the same. Background technique [0002] In circuit design, a reference voltage generating circuit is usually used to generate a more accurate reference voltage as a reference for other components. The reference voltage generation circuit has various forms, among which the bandgap reference voltage generation circuit is more commonly used. The internal components of this type of circuit will adjust their voltage or current in response to the temperature coefficient, so that the generated reference voltage can be maintained at a stable value. [0003] However, when the bandgap reference voltage generation circuit includes a current mirror, the voltage change caused by the temperature cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
CPCG05F1/468G05F3/30
Inventor 王巧星
Owner SILICON MOTION INC (CN)
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