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Threshold voltage generation circuit and method

A threshold voltage and circuit generation technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of complex process, long time consumption, low efficiency, etc., and achieve the effect of simple circuit structure and easy implementation.

Active Publication Date: 2012-06-13
IPGOAL MICROELECTRONICS (SICHUAN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The threshold voltage usually changes with the process and temperature. In the existing technology, the threshold voltage is often obtained by searching the database. The process is very complicated, takes a long time, and is very inefficient.

Method used

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  • Threshold voltage generation circuit and method

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Embodiment Construction

[0017] see figure 1 A preferred embodiment of the threshold voltage generating circuit of the present invention includes a first switching element, a second switching element connected to the first switching element, a third switching element connected to the second switching element, a A current source I connected to three switching elements, a power supply terminal VDD connected to the current source I, a ground terminal GND connected to the first switching element, and an output connected to the first switching element and the second switching element Terminal VOUT.

[0018] In this embodiment, the first switch element is a first field effect transistor M1, the second switch element is a second field effect transistor M2, and the third switch element is a third field effect transistor M3. And the first FET M1 , the second FET M2 and the third FET M3 are all N-type FETs (NMOS). In other implementation manners, the switching elements can be changed to other switching elemen...

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Abstract

The invention discloses a threshold voltage generation circuit. The threshold voltage generation circuit comprises a first switch element, a second switch element connected with the first switch element, a third switch element connected with the second switch element, a current source connected with the third switch element, a power terminal connected with the current source, an earthing terminal connected with the first switch element and an output terminal connected with the first and second switch elements to output the threshold voltage. The width to length ratio of the first switch element is equal to the width to length ratio of the third switch element and is three times of the width to length ratio of the second switch element. The invention further provides a threshold voltage generation method. The threshold voltage generation circuit can generate accurate threshold voltage and is simple in structure and easy to realize.

Description

technical field [0001] The invention relates to a voltage generating circuit and method, in particular to a threshold voltage generating circuit and method capable of generating threshold voltage. Background technique [0002] Generally, the input voltage corresponding to the end point of the turning point where the output voltage changes sharply with the input voltage in the transfer characteristic curve is called the threshold voltage, also called the turn-on voltage. [0003] The threshold voltage usually changes with changes in process and temperature. In the prior art, the threshold voltage is often obtained by searching a database. The process is very complicated, takes a long time, and is very inefficient. Therefore, it is necessary to provide a threshold voltage generating circuit and method that has a simple structure and can directly generate a relatively accurate threshold voltage. Contents of the invention [0004] In view of the above, it is necessary to prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 范方平
Owner IPGOAL MICROELECTRONICS (SICHUAN) CO LTD
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