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A High Precision Zero Temperature Drift Regulator Circuit With Adjustable Reference Voltage

A technology of reference voltage and voltage regulator, applied in the direction of instruments, regulating electrical variables, control/regulating systems, etc., can solve the problem of inability to modify, and achieve the effect of improving circuit performance and reducing design difficulty

Active Publication Date: 2019-11-22
NANJING MICRO ONE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that after the temperature of the reference voltage zero temperature drift point of the voltage regulator circuit is determined, the voltage of the reference voltage zero temperature drift point is fixed by the production process and cannot be modified

Method used

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  • A High Precision Zero Temperature Drift Regulator Circuit With Adjustable Reference Voltage
  • A High Precision Zero Temperature Drift Regulator Circuit With Adjustable Reference Voltage
  • A High Precision Zero Temperature Drift Regulator Circuit With Adjustable Reference Voltage

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Embodiment Construction

[0012] Such as figure 1 , The VDD voltage source is added to one end of the R14 resistor, and the other end of the voltage source is grounded. VDD can take any value between 3 and 40V. The reference voltage is shorted to the output terminal, and the other end of the resistor R14 is connected to the output terminal. At this time, the circuit will enter a normal working state, and the output terminal after current limiting through the resistor R14 is equal to the reference voltage. When R6=0, the collector current ratio of PNP1 and PNP2 is 1:1, so the collector current ratio of NPN3 and NPN4 is 1:1, according to the formula VBE=VT*ln(Ic / Is), VBE is the transistor NPN6 The emitter junction conduction voltage, VT is the thermal voltage, Ic is the collector current of the triode NPN6, and Is is the saturation current of the triode NPN6. According to the formula, VBE3 of NPN3 is equal to VBE4 of NPN4, so the base of NPN3 is at the same potential as the base of NPN4, ignoring the in...

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Abstract

Disclosed is a high-precision zero-temperature-drift voltage regulator circuit with the adjustable reference voltage value. The circuit core is a zero-temperature-drift band-gap reference circuit withthe adjustable voltage, which comprises PNP triodes PNP1 and PNP2, NPN triodes NPN1, NPN2, NPN3, NPN4, NPN6, NPN7, NPN8 and NPN9, resistors R1, R2, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13 and R14,and capacitors C1 and C2. The resistor R6 connected between the base electrode of the NPN1 and the base electrode of the NPN2 is an adjustable resistor, and the zero-temperature-drift reference voltage value is changed by the value of the resistor R6; and when the production process is limited, the reference voltage value can be modified without decreasing the temperature coefficient of the reference voltage.

Description

technical field [0001] The invention relates to a voltage stabilizer, in particular to a high-precision zero-temperature-drift voltage stabilizer circuit with an adjustable reference voltage value, which belongs to the technical field of integrated circuits. Background technique [0002] When designing a reference voltage using a bandgap reference structure, it is generally desirable to set the zero temperature drift point of the reference voltage at the center of the circuit application temperature range, so that a reference voltage with a small temperature coefficient in the entire temperature range can be obtained. The zero temperature drift regulator designed with traditional circuit architecture is greatly limited by the production process. When the process is determined, if the zero temperature drift point needs to be set at the middle point of the application temperature range (usually around 60°C), Its reference voltage value is limited by the process and cannot be c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 于圣武李宇张洪俞
Owner NANJING MICRO ONE ELECTRONICS