A linear low dropout constant current source circuit and common source amplifier

A common source amplifier and error amplifier technology, applied in the field of frequency compensation, can solve the problems of large power consumption and rising cost.

Active Publication Date: 2020-07-21
MAXIC TECHNOLOGY CORPORATION
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  • Claims
  • Application Information

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Problems solved by technology

[0014] In view of this, the purpose of this application is to provide a low-dropout linear constant-current source circuit and a common-source amplifier, which are used to solve the need for larger chips to maintain low power consumption in the low-dropout linear constant-current source circuit in the prior art. The problem of rising cost caused by area

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  • A linear low dropout constant current source circuit and common source amplifier
  • A linear low dropout constant current source circuit and common source amplifier
  • A linear low dropout constant current source circuit and common source amplifier

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Embodiment Construction

[0061] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only It is a part of the embodiments of this application, not all of them. The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without...

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Abstract

The invention provides a linear low-dropout constant-current source circuit and a common source electrode amplifier. The linear low-dropout constant-current source circuit comprises a first-stage error amplifier, a second-stage common source electrode amplifier, a third-stage source electrode follower and an output current feedback circuit; an in-phase input end of the first-stage error amplifieraccesses a feedback amount of output current, and an inverted-phase input end of the first-stage error amplifier accesses reference voltage; the second-stage common source electrode amplifier comprises a first MOSFET, a constant current source and a second capacitor; the output current feedback circuit comprises a second MOSFET and a current converter; an output end of the current converter is connected with the in-phase input end of the first-stage error amplifier, and a second output end of the current converter is connected with output voltage; a grid electrode of the third-stage source electrode follower is connected with a grid electrode of the second MOSFET, a source electrode of the third-stage source electrode follower is connected with output voltage of a load, and a drain electrode of the third-stage source electrode follower accesses input voltage. The cost of the circuit can be effectively reduced.

Description

technical field [0001] The present application relates to the technical field of frequency compensation, in particular to a linear low-dropout constant-current source circuit and a common-source amplifier. Background technique [0002] Low dropout linear constant current source circuit is widely used in lithium battery charging and management systems, figure 1 It is a schematic diagram of the structure of the existing low-dropout linear constant current source circuit, such as figure 1 As shown, the low-dropout linear constant current source circuit includes: a first-stage error amplifier 11, a second-stage common-source amplifier 12, a third-stage source follower 13, and an output current feedback circuit 14, wherein, [0003] The first-stage error amplifier 11 is used to compare and amplify the feedback amount of the output current of the output current feedback circuit 14 with the reference voltage (Vref); wherein, the feedback amount of the output current is a voltage, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 郭越勇
Owner MAXIC TECHNOLOGY CORPORATION
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