A Reconfigurable Operational Transconductance Amplifier

A technology of transconductance amplifier and auxiliary amplifier, which is applied to differential amplifiers, DC-coupled DC amplifiers, etc., can solve the problems of nonlinear distortion, increased distortion, and low transconductance efficiency of circuits, and can reduce current and power. The effect of consumption and good application prospect

Active Publication Date: 2022-07-01
TIANJIN UNIV
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Problems solved by technology

In the traditional structure, the input differential pair tube is in the saturation region, and its transconductance efficiency (g m / I D ) is lower, requiring more power dissipation to achieve the same specifications, such as gain (g m *R OUT ) and bandwidth (g m / C L )Wait
At the same time, the active devices used in the design of the operational transconductance amplifier are all nonlinear responses, so it will cause nonlinear distortion of the circuit, and the degree of distortion increases with the increase of the input signal swing

Method used

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  • A Reconfigurable Operational Transconductance Amplifier
  • A Reconfigurable Operational Transconductance Amplifier
  • A Reconfigurable Operational Transconductance Amplifier

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Embodiment Construction

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0017] figure 1 It is the overall principle block diagram of the present invention, including a proportional to absolute temperature (PTAT) current source bias circuit, a common mode feedback (CMFB) circuit and a main circuit of a configurable operational transconductance amplifier. The output end is connected to the input end of the common mode feedback circuit, and the output end of the common mode feedback circuit is connected to a configurable operational transconductance amplifier, and the configurable operational transconductance amplifier receives the input voltage signal and the output of the common mode feedback circuit signal, and output the current signal according to ...

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Abstract

The invention discloses a reconfigurable operational transconductance amplifier, comprising an NMOS transistor M 17 , NMOS tube M 18 , PMOS tube M 19 , PMOS tube M 20 ;NMOS tube M 17 , NMOS tube M 18 The source of the switch S 2 connected, and are separated by resistors R N1 and resistor R N2 Connected to GNDA, PMOS tube M 19 , PMOS tube M 20 The source of the switch S 1 connected, and are separated by resistors R P1 and resistor R P2 Connected to VDDA; NMOS transistor M 17 , PMOS tube M 19 The gate is connected to the positive input V INP , the drain is connected to the common mode feedback circuit, the NMOS tube M 18 , PMOS tube M 20 The gate is connected to the negative input V INN , the drain is connected to the common mode feedback circuit. The reconfigurable open-loop operational transconductance amplifier provided by the present invention uses an analog switch to configure a high linearity and low power consumption mode of the operational transconductance amplifier.

Description

technical field [0001] The invention relates to the technical field of analog CMOS integrated circuits, in particular to a reconfigurable operational transconductance amplifier. Background technique [0002] An operational transconductance amplifier is a circuit structure that converts an input voltage signal into an output current signal, and is widely used in modern electronic systems. Operational transconductance amplifier circuits often use a common source structure, which has the advantages of large input impedance, small output impedance, large transconductance value, and good compatibility, so it is widely used. In the traditional structure, the input differential pair tube is in the saturation region, and its transconductance efficiency (g m / I D ) is lower, requiring more power dissipation to achieve the same specifications, such as gain (g m *R OUT ) and bandwidth (g m / C L )Wait. At the same time, the active devices used in the design of the operational tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45
CPCH03F3/45
Inventor 廖轰王科平
Owner TIANJIN UNIV
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