A Bandgap Reference Voltage Circuit

A technology that refers to voltage and circuit, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of circuit not starting, sensitive to the rate of rise of power supply voltage, difficulty, etc.

Inactive Publication Date: 2016-02-03
张伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adjust R2 / R1 in the design so that Vref must be in a certain voltage range to achieve a parabolic curve for temperature changes, which makes the reference voltage outside the voltage range unable to achieve full temperature compensation, which causes problems in multi-reference voltage applications. Difficult, so need to improve
In addition, because the start-up circuit of the bandgap reference voltage circuit is very sensitive to the rise rate of the power supply voltage, it is easy to cause the circuit not to start, so it also needs to be improved

Method used

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  • A Bandgap Reference Voltage Circuit
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Examples

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Embodiment 1

[0020] See figure 1 The present invention relates to a multi-reference voltage output bandgap circuit. The current source is divided into three paths: the first path is connected to the emitter of the transistor T2 via a resistor R1, the base of T2 is connected to the collector and then grounded; the second path is connected to The emitter of the transistor T1 is connected, and the base of T2 is connected to the collector

[0021] Grounding; the third path is grounded through resistors R4 and R2, where the voltage Vref output point is between resistors R4 and R2; the first path and the second path are also connected to the input end of the operational amplifier OP, and the OP input ends are both The resistor R3 is grounded, and the output terminal voltage is connected to VDD.

Embodiment 2

[0023] See figure 2 The difference between the second embodiment and the first embodiment is that the input terminal of the operational amplifier is grounded through the MOS transistors N1 and N2 after R3, and the control terminal G of the N2 is connected to the third loop.

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PUM

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Abstract

The invention relates to a band gap reference voltage circuit. The voltage VDD is divided into three paths; the first path is connected with an emitter of a triode T2 through a resistor R1, and a base of the T2 is connected with a collector and then is grounded; the second path is connected with an emitter of a triode T1, and a base of the T1 is connected with a collector and then is grounded; the third path is grounded through resistors R4 and R2, and a voltage Vref output point is positioned between the resistor R4 and the resistor R2; and the first path and the second path are connected to the input end of an operational amplifier OP, and the input end of the OP is grounded through a resistor R3, and the output end of the OP directly controls a constant current source circuit. The band gap reference voltage circuit has a startup enhancing function.

Description

Technical field [0001] The invention relates to a band gap reference voltage circuit. Background technique [0002] Power converters, such as DC-DC converters or AC-DC converters, generally consume more energy when operating at full load. The power consumption of this kind of semiconductor device will cause the temperature to rise rapidly, cause the drift of the chip reference voltage, and cause the instability of the output voltage. DC voltage is particularly susceptible to DC voltage converters and power amplifiers, because higher output voltages and larger output currents require a more stable power supply system. [0003] The band gap reference circuit can be used to alleviate problems related to temperature drift. This is usually composed of a temperature compensation unit, a Brakow unit and a transistor or resistor with a negative temperature coefficient. Many different types of bandgap circuits have been used. For example: the voltage difference between two diodes with t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/30
Inventor 张伟
Owner 张伟
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