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Current mirror circuit with temperature resistance

A current mirror and circuit technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as difficulty in using current mirrors, and achieve the effects of good work, reduced voltage drop, and good performance

Inactive Publication Date: 2018-09-04
深圳天狼芯半导体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current mirror is difficult to use in the environment of low supply voltage

Method used

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  • Current mirror circuit with temperature resistance
  • Current mirror circuit with temperature resistance
  • Current mirror circuit with temperature resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as Figure 1-Figure 2 As shown, a current mirror circuit with temperature resistance includes a current mirror device 1, a step-down device 2 and a power input device 3;

[0032] The power input device 3 is connected to a power supply voltage to obtain a high potential;

[0033] The step-down device 2 is connected to the power input device 3 and the current mirror device 1 respectively;

[0034] The power input terminal 301 of the power input device 3 is connected to a power supply voltage to obtain a high potential;

[0035] The step-down input terminal 201 of the step-down device 2 is connected to the first output terminal 302 of the power supply input device 3;

[0036] The current mirror input terminal 101 of the current mirror device 1 is connected to the second output terminal 303 of the power supply input device 3, and the current mirror input terminal 101 of the current mirror device 1 is connected to the step-down device 2. Output terminal 202 , the cur...

Embodiment 2

[0050] Such as figure 1 and image 3 As mentioned above, based on Embodiment 1, the difference from Embodiment 1 is that the power input device includes a seventh transistor 31, an eighth transistor 32 and a feedback network 33;

[0051] The drain of the seventh type transistor and the drain of the eighth transistor 32 are connected to the power supply voltage, the source of the seventh type transistor is connected to the gate of the sixth transistor 24, the The drain of the seventh transistor 31 is connected to the drain of the second transistor 11;

[0052] The source of the eighth transistor 32 is connected to the gate of the third transistor 21; one end of the feedback network 33 is connected to the power supply voltage, and the other end is grounded.

[0053] The seventh transistor 31 has a first temperature coefficient, which is generally negative because the seventh transistor 31 is an NMOS transistor. When the temperature changes, the seventh transistor 31 can apply a...

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Abstract

The invention particularly discloses a current mirror circuit with temperature resistance. The circuit comprises a current mirror device, a voltage reduction device and a power input device; the powerinput end of the power input device is connected with power voltage to obtain high potential; the voltage reduction input end of the voltage reduction device is connected with the first power outputend of the power input device; the current mirror input end of the current mirror device is connected with the second power output end of the power input device, the current mirror input end of the current mirror device is connected with the voltage reduction output end of the voltage reduction device, and the current mirror output end of the current mirror device is connected with the voltage reduction output end of the voltage reduction device. According to the current mirror circuit, voltage reduction of a source drain end of a transistor of a current mirror can be reduced, during low powervoltage, high enough voltage reduction can be provided for a module for generating current, the voltage stabilization and compensation effects and the temperature interference resistance function areachieved through the power input device, the whole circuit better works, and the better performance is obtained.

Description

technical field [0001] The invention relates to the field of semiconductor circuits, in particular to a current mirror circuit with temperature resistance. Background technique [0002] The power application circuits that supply power to portable electronic devices, automotive electronics, and medical equipment require stable and low-noise voltages. The power supply rejection ratio (PSRR) in these application circuits is very important. Linear buck regulator circuit (LDO), suitable for use in the above application circuits, needs to suppress noise from high-speed digital circuits, step-down converters or other switching circuits on the chip. The power supply rejection ratio data of the linear step-down voltage regulator circuit is used to quantify the ability of the linear step-down voltage regulator circuit to suppress the input power ripple of different frequencies, which reflects that the linear step-down voltage regulator circuit is not affected by noise and voltage. fl...

Claims

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Application Information

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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 曾健忠
Owner 深圳天狼芯半导体有限公司
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