Current temperature coefficient control circuit based on reference source
A technology of temperature coefficient and control circuit, applied in control/regulation system, regulating electrical variables, instruments, etc., can solve the problems of affecting the voltage temperature coefficient of zero temperature coefficient, unable to guarantee the zero temperature coefficient of voltage, etc.
Active Publication Date: 2021-03-12
BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +3
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Problems solved by technology
If it is necessary to adjust the temperature coefficient of the current in the reference source, it will affect the temperature coefficient of the zero temperature coefficient voltage, and the zero temperature coefficient of the voltage cannot be guaranteed
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[0019] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.
[0020] figure 1 It is a schematic structural diagram of a current temperature coefficient control circuit based on a reference source provided by an embodiment of the present invention. Such as figure 1 As shown, the embodiment of the present invention provides a current temperature coefficient control circuit based on a reference source, including: a zero temperature coefficient voltage generation module 11 for generating a zero temperature coefficient voltage; an adjustable temperature coefficient current generation module 12, including a third The resistor R3, the seventh PMO...
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The invention relates to the technical field of integrated circuits, and provides a current temperature coefficient control circuit based on a reference source, and the circuit comprises a zero temperature coefficient voltage generation module which is used for generating a zero temperature coefficient voltage; an adjustable temperature coefficient current generation module, comprising a third resistor R3, a seventh PMOS transistor MP7 and a sixth PMOS transistor MP6, and used for obtaining reference current with an adjustable temperature coefficient through the sum of the positive temperaturecoefficient current of the seventh PMOS transistor MP7 and the negative temperature coefficient current of the sixth PMOS transistor MP6 under the condition that the zero temperature coefficient voltage is stable; and the adjustable temperature coefficient of the reference current is obtained by adjusting the resistance value of the third resistor R3 to which the negative temperature coefficientcurrent is applied. According to the embodiment of the invention, the adjustment of the current temperature coefficient in the reference source is realized on the premise of ensuring the stable voltage characteristic of the zero temperature coefficient in the reference source.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a current temperature coefficient control circuit based on a reference source. Background technique [0002] In the existing reference source that realizes zero temperature coefficient voltage, two transistors with different current densities with positive temperature coefficient are mainly used to obtain V BE The voltage difference is added to a low temperature coefficient resistor to obtain a current proportional to the temperature, and then the current is sent to a low temperature coefficient resistor of the same type to obtain a positive temperature coefficient voltage. voltage and the transistor has a negative temperature coefficient of V BE Added together, a zero temperature coefficient voltage is obtained. If the temperature coefficient of the current in the reference source needs to be adjusted, it will affect the temperature coefficient of the zero temperat...
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IPC IPC(8): G05F3/26
CPCG05F3/262
Inventor 唐晓柯胡毅赵东艳李振国冯文楠汪宇怀
Owner BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY