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Band gap reference voltage generating circuit

A technology for generating circuits and reference voltages, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as difficulty in normal operation and inability to ensure the conduction of BJT transistor 130

Inactive Publication Date: 2013-05-08
SILICON MOTION TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But even if the start-up circuit 170 is added, it still cannot guarantee that the BJT transistor 130 will be turned on in all states, so it is difficult to ensure that the traditional bandgap reference voltage generating circuit 100 can operate normally

Method used

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Embodiment Construction

[0041] figure 2It is a circuit diagram of a bandgap reference voltage generator 200 according to the present invention. The bandgap reference voltage generating circuit 200 is coupled between the voltage source Vcc and the ground potential. In one embodiment, the bandgap reference voltage generating circuit 200 includes a first current generating circuit 201 , a second current generating circuit 202 , a clamping circuit 203 , and an output voltage generating circuit 204 . The first current generating circuit 201 generates a current I with a positive temperature coefficient 1 , that is, the current I 1 will increase in size with increasing temperature. The second current generating circuit 202 generates a current I with a negative temperature coefficient 2 , that is, the current I 2 The size will decrease with the increase of temperature. The clamping circuit 203 clamps the node 261 of the first current generating circuit 201 , the node 262 of the second current generati...

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Abstract

The invention provides a band gap reference voltage generating circuit. The gap reference voltage generating circuit comprises a first current generating circuit, a second current generating circuit and an output voltage generating circuit. The first current generating circuit produces first current with positive temperature coefficient. The second current generating circuit produces second current with positive temperature coefficient. The output voltage generating circuit produces third current equal to the first current, fourth current equal to the second current and converging current which is produced by adding the third current and the fourth current and is approximate to zero-temperature coefficient, and produces reference voltage according to converging current.

Description

【Technical field】 [0001] The present invention relates to reference voltages, in particular to reference voltage generating circuits. 【Background technique】 [0002] The reference voltage generator provides the circuit with a reference voltage level. Most analog circuits require a reference voltage for accurate operation. For example, the voltage of the least significant bit (LSB) of the analog-to-digital converter and the digital-to-analog converter, and the output voltage of a regulator (regulator) all need to be determined according to the reference voltage. Therefore, the reference voltage generator must provide an accurate and stable reference voltage in order to maintain the performance of the circuit. [0003] However, the electrical properties of most analog circuit components are prone to change with temperature. In order to prevent the performance of the circuit from changing with temperature, the reference voltage generator must still provide a stable reference...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/16
Inventor 张蕙如洪硕钧
Owner SILICON MOTION TECH CORP
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