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Bandgap Reference Circuit

A technology of energy gap reference and reference voltage, applied in the direction of regulating electrical variables, instruments, control/regulating systems, etc.

Active Publication Date: 2020-04-28
ELITE SEMICON MEMORY TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in order to be widely used in different applications, the bandgap reference circuit may need to output different voltage levels

Method used

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Examples

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Embodiment Construction

[0029] figure 2 A circuit diagram of a bandgap reference circuit 200 incorporating an embodiment of the present invention is shown. Such as figure 2 As shown, the energy gap reference circuit 200 includes a current source unit 22, an operational amplifier OP1, an operational amplifier OP2, a resistor R1, a bipolar transistor Q1, a bipolar transistor Q2, a feedback transistor M4, a voltage divider circuit 24 and a resistor R4.

[0030] The current source unit 22 provides a plurality of stable bias currents I1 , I2 and I3 . In this embodiment, the current source unit 22 is configured as a current mirror and is composed of three PMOS transistors M1 , M2 and M3 . refer to figure 2 , the PMOS transistor M1 has a source coupled to a supply voltage source VDD, has a gate coupled to an output terminal of the operational amplifier OP1, and has a gate coupled to an inverting input terminal of the operational amplifier OP1 a drain. The PMOS transistor M2 has a source coupled to ...

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Abstract

The energy gap reference circuit includes a first operational amplifier, a second operational amplifier, a first current source, a second current source, a third current source, a first bipolar transistor, and a second bipolar transistor. transistor, a feedback element and a voltage divider circuit. The voltage dividing circuit is used to divide the voltage difference between an input of the second operational amplifier and a base of the second bipolar transistor to provide a reference voltage.

Description

technical field [0001] The invention relates to an energy gap reference circuit. Background technique [0002] A bandgap reference circuit is used to generate an accurate output voltage. The output voltage generated by the bandgap reference circuit is not affected by process, supply power and temperature variations. Therefore, the bandgap reference circuit can be widely used in various analog circuits and digital circuits that require accurate reference voltages during operation. [0003] figure 1 A common bandgap reference circuit 100 is illustrated. refer to figure 1 , the bandgap reference circuit 100 includes PMOS transistors M1, M2 and M3, an operational amplifier OP, resistors R1 and R2, and bipolar transistors Q1, Q2 and Q3. When the base current is neglected, the output voltage VOUT of the bandgap reference circuit 100 can be expressed as: [0004] [0005] Among them, VEB3 is the emitter-base voltage difference of the bipolar transistor Q3, VT is the therma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 刘建兴
Owner ELITE SEMICON MEMORY TECH INC