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Constant transconductance amplifier circuit

A technology of amplifier circuit and transconductance amplifier, which is used in amplifiers, differential amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., and can solve the problem that the transconductance varies greatly with the application environment.

Active Publication Date: 2017-11-24
SHANGHAI JUNTAO POWER EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problem that the transconductance of the existing transconductance amplifier varies greatly with the application environment, the present invention provides a constant transconductance amplifier circuit

Method used

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Embodiment Construction

[0011] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0012] In order to solve the technical problem that the transconductance of the existing transconductance amplifier varies greatly with the application environment, the invention provides a constant transconductance amplifier circuit. Such as figure 2 as shown,

[0013] Including: a first PMOS transistor P1, a second PMOS transistor P2, a third PMOS transistor P3, a fourth PMOS transistor P4, a fifth PMOS transistor P5...

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Abstract

The invention provides a constant transconductance amplifier circuit, and belongs to the field of semiconductor integrated circuit technology. The technical problem that the transconductance of the existing transconductance amplifier varies with the application environment is solved. The circuit comprises a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, a fourth PMOS transistors, a fifth PMOS transistor, a first NMOS transistor, a second NMOS transistor, a third NMOS transistor, a fourthNMOS transistor, a first resistor and a second resistor. According to the constant transconductance amplifier circuit, the circuit imports the first resistor and the second resistor on the basis of the traditional transconductance amplifier circuit, so that the transconductance and bias current size of a transconductance amplifier, and the size of an input geminate transistor are irrelevant to the working state of the transconductance amplifier. If the constant transconductance amplifier circuit is applied to DC-DC and other power systems, the loop stability of the system is greatly facilitated.

Description

technical field [0001] The invention belongs to the technical field of semiconductor integrated circuits, and in particular relates to a constant transconductance amplifier circuit. Background technique [0002] A transconductance amplifier is an amplifier that converts an input differential voltage to an output current, thus it is a voltage controlled current source. In power systems such as DC-DC, a transconductance amplifier is often needed to amplify the voltage difference between the feedback point of the output voltage and the reference voltage, and build a negative feedback loop to obtain a stable output voltage. [0003] Traditional transconductance amplifiers such as figure 1 As shown, it consists of the first PMOS transistor P1, the second PMOS transistor P2, the third PMOS transistor P3, the fourth PMOS transistor P4, the fifth PMOS transistor P5, the first NMOS transistor N1, the second NMOS transistor N2, the third NMOS The transistor N3 and the fourth NMOS tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
CPCH03F3/45179H03F2203/45031
Inventor 不公告发明人
Owner SHANGHAI JUNTAO POWER EQUIP CO LTD
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