High-threshold value voltage comparison circuit consisting of high-precision low-voltage comparator

A high-threshold voltage, comparison circuit technology, applied in multiple input and output pulse circuits and other directions, to achieve the effect of simple circuit, expanded use range, and low power consumption

Inactive Publication Date: 2011-02-02
HUBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some comparators are disclosed in some Chinese patents such as 200810055879.4 and 200710188495.5, but t

Method used

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  • High-threshold value voltage comparison circuit consisting of high-precision low-voltage comparator
  • High-threshold value voltage comparison circuit consisting of high-precision low-voltage comparator
  • High-threshold value voltage comparison circuit consisting of high-precision low-voltage comparator

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Example Embodiment

[0020] in figure 1 Here, the specific connection relationship of the circuit of the present invention is: the non-inverting input terminal of the op amp omp1 is connected to a reference voltage, where a reference voltage of VBG=1.2V is connected, and the inverting input terminal of the op amp omp1 is connected to node 2. , The two ends of the resistor R1 are connected to ground and node 2, the gate of the high-voltage tube M1 is connected to the output terminal of the op amp omp1, the source terminal of the high-voltage tube M1 is connected to node 2, and the drain of the high-voltage tube M1 And the drain of low-voltage PMOS tube M2 and one end of resistor R2 are connected to node 3. omp2 is used as an ordinary low-voltage comparator here, the non-inverting input terminal of omp2 is connected to node 3, and the two ends of resistor R3 are respectively connected To node 1 and node 4, the inverting input terminal of omp2 is connected to node 4, the output of omp2 is directly conn...

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Abstract

The invention aims to provide a circuit for realizing high-threshold value comparison by using a high-precision low-voltage comparator. The circuit mainly comprises low-voltage operational amplifiers omp1 and omp2, resistors R1, R2 and R3, M2, M3, M1 and M4, wherein the M2 and the M3 are power metal-oxide semiconductors (PMOS) with the breadth length ratio of 1:1 and form a current mirror; the M1 and the M4 are two high-voltage field effect transistors; and the omp2 is used as a comparator. Compared with the circuit manufactured by the conventional method, the circuit has the advantages of simpleness, low power consumption, great reduction in cost and use range extension by using a low-voltage device to realize the high-threshold value comparison. A high threshold value is parallelly shifted to a low-threshold value range to serve as an input of the low-voltage comparator, so that the high-threshold value comparison can be realized. The integrated production of the circuit can be realized by monolithic integration process technology (a BCD process).

Description

technical field [0001] The invention relates to basic electronic circuit technology, in particular to a circuit for realizing high-threshold voltage comparison with a high-precision low-voltage comparator. Background technique [0002] The voltage comparator is referred to as a comparator for short. Its basic function is to compare two input voltages, and output a high-level or low-level voltage according to the comparison result, and judge the magnitude and polarity of the input signal accordingly. Voltage comparators are often used in many occasions such as automatic control, waveform generation and conversion, analog-to-digital conversion, and limit alarms. Comparators are one of the most widely used circuits in electronic systems. [0003] At present, in the electronic circuit industry, comparator circuits composed of low-voltage devices have relatively high precision, but their comparison voltage range will be limited by the device voltage, which is generally relatively...

Claims

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Application Information

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IPC IPC(8): H03K5/22
Inventor 杨维明潘希武杨武韬吴国婧张豪杰杨道虹
Owner HUBEI UNIV
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