Voltage comparator

A voltage comparator and power supply technology, applied in the electronic field, can solve the problems of large circuit power consumption, reduced circuit reliability, large actual circuit power consumption, etc., and achieve the effect of low static power consumption and few power consumption branches

Active Publication Date: 2014-11-19
SHENZHEN GOODIX TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two disadvantages of this circuit: First, under the balanced state of the measured voltage VIN = the first input terminal VR, IB will be evenly distributed in the branches where M1 and M2 are located, that is to say, the current of 0.5*IB Just enough to support M2 branch work
However, if VIN causes M1 to be completely turned off, under normal circumstances IB will all flow through M2. Obviously, the excess 0.5*IB current is wasted
Second, the tail current source IB is generally composed of NMOS transistors, which require an additional bias circuit to provide the gate voltage, so the actual power consumption of the circuit will be greater
[0004] The fully differential high-speed low-power comparator of Chinese patent CN201210242224.4 has the advantages of high output slew rate and fast speed, but it

Method used

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Examples

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Example Embodiment

[0030] Embodiment one

[0031] like figure 2 As shown, the present invention proposes a voltage comparator, including a first branch A1, a second branch A2 and a third branch A3, and the first branch includes a first transistor M1, a second transistor M2 and a third transistor M3 , the source of the first transistor M1 is connected to the power supply VDD, the gate is connected to the drain, and the drain is connected to the drain of the second transistor M2. The gate of the second transistor M2 is connected to the first input terminal VR, and the source is connected to the drain of the third transistor M3. The source of the third transistor M3 is grounded to VSS, and the drain is connected to the gate. The first branch A1 has a self-bias function, and does not need an external input bias signal to control its current magnitude. The current in the A1 branch is proportional to VR, because the higher the VR is, the smaller the on-resistance of the second transistor M2 is, an...

Example Embodiment

[0040] Embodiment two

[0041] like image 3 As shown, the difference between the voltage comparator in this embodiment and the first embodiment is that one end of the first resistor R1 is connected to the second input terminal VIN, and the other end is connected to the power supply VDD. In this embodiment, the first transistor M1 , the second transistor M2 , the fourth transistor M4 , the fifth transistor M5 and the seventh transistor M7 are PMOS, and the third transistor M3 , the sixth transistor M6 and the eighth transistor M8 are NMOS.

Example Embodiment

[0042] Embodiment three

[0043] like Figure 4 As shown, a voltage comparator disclosed in this embodiment includes a first branch A1, a second branch A2 and a third branch A3, and the first branch A1 includes a first transistor M1, a second transistor M2 and a first transistor M1. Three transistors M3, the source of the first transistor M1 is connected to the power supply VDD, the gate is connected to the drain, and the drain is connected to the drain of the second transistor M2. The gate of the second transistor M2 is connected to the first input terminal VR, and the source is connected to the drain of the third transistor M3. The source of the third transistor M3 is grounded to VSS, and the drain is connected to its gate.

[0044] The second branch A2 includes a fourth transistor M4, a fifth transistor M5 and a sixth transistor M6. The source of the fourth transistor M4 is connected to the power supply VDD, the gate is connected to the drain, and the drain is connected t...

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PUM

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Abstract

The invention is applicable to the field of electronic technology, and provides a voltage comparator comprising a first branch, a second branch and a third branch. The first branch and the second branch are both equipped with self-biasing capabilities, and require no special biasing circuit. Under the same supply voltage, the static power consumption is relatively low, the power consumption branches of the circuit are less, and the reliability is high under low power consumption.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a voltage comparator with low static power consumption. Background technique [0002] Low power consumption technology has received more and more attention in portable electronic devices. For example, for smart phones and tablet computers, static power consumption has become a key indicator of these products. Because these products use batteries as the power supply, the reduction of power consumption means the increase of standby time and the extension of service life, which will eventually bring users a better experience. [0003] like figure 1 as shown, figure 1 An ordinary voltage comparator circuit is given, and the power consumption of the circuit is determined by the size of the tail current source IB. There are two disadvantages of this circuit: First, under the balanced state of the measured voltage VIN = the first input terminal VR, IB will be evenly distributed i...

Claims

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Application Information

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IPC IPC(8): H03K5/22
CPCH03K5/22H03K5/2481H03F3/45071G01R19/0038
Inventor 詹昶
Owner SHENZHEN GOODIX TECH CO LTD
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