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Reference current source circuit

A reference current source and voltage adjustment circuit technology, which is applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve the problems of poor sensitivity characteristics of reference current sources, achieve the effect of improving sensitivity characteristics and maintaining stability

Active Publication Date: 2021-05-21
SEMICON MFG INT (SHANGHAI) CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the sensitivity characteristics of existing reference current sources are still poor

Method used

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Embodiment Construction

[0024] figure 1 It is a schematic diagram of a circuit structure of a reference current source in the prior art. refer to figure 1 , The reference current source circuit 1 includes NMOS transistors M1, M2 and M5, PMOS transistors M3, M4 and M6, a transistor Q1 and several transistors Q2 connected in parallel.

[0025] Wherein, the NMOS transistor M1, the NMOS transistor M2, the PMOS transistor M3 and the PMOS transistor M4 form a current mirror, the gates of the PMOS transistor M3 and the PMOS transistor M4 are connected, and the sources are connected to the power supply voltage output terminal Vdd. The drain of the PMOS transistor M3 is connected to the drain of the NMOS transistor M1, and the drain of the PMOS transistor M4 is connected to the drain of the NMOS transistor M2. The gate and drain of the PMOS transistor M3 are connected to form a diode. The gate of the NMOS transistor M1 is connected to the gate of the NMOS transistor M2. The drain of the NMOS transistor M1...

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Abstract

The invention discloses a reference current source circuit which comprises a first PMOS transistor, a first NMOS transistor connected with the first PMOS transistor in series, a second PMOS transistor connected with a grid electrode of the first PMOS transistor, and a second NMOStransistor connected with the second PMOS transistor in series; a first voltage regulation circuit connected with a current generation circuit and suitable for enabling the voltage value of the drain electrode of the first PMOS transistor to be equal to the voltage value of the drain electrode of the second PMOS transistor by regulating the voltage of the source electrode of the second NMOS transistor when the voltage of the drain electrode of the second PMOS transistor changes; and a second voltage regulation circuit connected with the current generation circuit and suitable for enabling the voltage value of the drain electrode of the first PMOS transistor to be equal to the voltage value of the drain electrode of the second PMOS transistor by regulating the voltage of the source electrode of the first NMOS transistor when the voltage of the drain electrode of the second PMOS transistor changes. By applying the scheme, the sensitivity characteristic of the reference current source can be improved.

Description

technical field [0001] The technical field of the current source of the embodiments of the present invention, in particular, relates to a reference current source circuit. Background technique [0002] In commonly used analog integrated circuits such as transconductance amplifiers and operational amplifiers, reference current sources are very important components. The base station current source can provide bias current for other circuits in the analog integrated circuit. [0003] In practical applications, it is necessary to avoid current mismatch in the reference current source as much as possible, so as to keep the output current of the reference current source stable, so as to meet the requirements for the sensitivity characteristics of the reference current source. [0004] However, the sensitivity characteristics of existing reference current sources are still poor. Contents of the invention [0005] The technical problem solved by the invention is how to improve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 张帅刘飞唐华
Owner SEMICON MFG INT (SHANGHAI) CORP
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