A Constant Transconductance Amplifier Circuit
A technology of amplifier circuit and transconductance amplifier, which is applied in the direction of amplifiers, differential amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve the problem of large changes in transconductance with the application environment, and achieve a favorable loop stability Effect
Active Publication Date: 2021-04-27
SHANGHAI JUNTAO POWER EQUIP CO LTD
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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
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[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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The invention provides a constant transconductance amplifier circuit, belonging to the technical field of semiconductor integrated circuits. The technical problem that the transconductance of the existing transconductance amplifier changes greatly with the application environment is solved. The circuit includes: a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, a fourth PMOS transistor, a fifth PMOS transistor, a first NMOS transistor, a second NMOS transistor, a third NMOS transistor, a fourth NMOS transistor, a a resistor and a second resistor. The constant transconductance amplifier circuit of the present invention introduces the first resistor and the second resistor on the basis of the traditional transconductance amplifier circuit. The transconductance of the transconductance amplifier has nothing to do with the size of the bias current, the size of the input pair tube and the working state of the transconductance amplifier. If the constant transconductance amplifier of the present invention is used in power systems such as DC-DC, it will greatly benefit the loop stability of the system.
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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IPC IPC(8): H03F3/45
CPCH03F3/45179H03F2203/45031
Inventor 不公告发明人
Owner SHANGHAI JUNTAO POWER EQUIP CO LTD