Inverting Pseudo Fully Differential Amplifier with Common-Mode Feedback Control Circuit

A fully differential amplifier and control circuit technology, applied in differential amplifiers, amplifiers with semiconductor devices/discharge tubes, amplifiers using switched capacitors, etc., can solve the problem that fully differential amplifier circuits cannot meet low voltage and low power consumption, etc. Achieve the effects of reducing design difficulty, reducing power consumption, and expanding the scope of application

Active Publication Date: 2020-09-11
BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this application, the fully differential amplifier circuit and its common-mode feedback circuit cannot meet the application requirements of low voltage and low power consumption.

Method used

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  • Inverting Pseudo Fully Differential Amplifier with Common-Mode Feedback Control Circuit
  • Inverting Pseudo Fully Differential Amplifier with Common-Mode Feedback Control Circuit
  • Inverting Pseudo Fully Differential Amplifier with Common-Mode Feedback Control Circuit

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Embodiment Construction

[0023] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0024] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0025] The present invention proposes an inverting pseudo-full differential amplifier with a common-mode feedback control circuit, and its common-mode feedback control circuit successfully maintains the output common-mode level of the inverting pseudo-full differential amplifier, which can ensure that the amplifier is used to achieve The normal operation of a second-order sigma-delta ADC.

[0026] figure 1 It is an overal...

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Abstract

The invention discloses an inverting pseudo full differential amplifier with a common mode feedback control circuit and a method for maintaining stable output common mode level. The inverting pseudo full differential amplifier includes a pseudo full differential operation circuit and a common mode feedback control circuit. The pseudo fully differential operation circuit includes inverter amplifiers (2) and (3), and the inverter amplifiers (2) and (3) respectively have a first feedback control terminal and a second feedback control terminal. The input terminals of the common-mode feedback control circuit are respectively connected with the output terminals of the inverter amplifiers (2) and (3), and are used to detect the common-mode output voltages of the inverter amplifiers (2) and (3), and the common-mode feedback control The output terminals of the circuit are respectively connected with the first feedback control terminal and the second feedback control terminal, and are used for forming common-mode feedback to the inverter amplifiers (2) and (3) so as to maintain the stability of the common-mode output level. The inverting pseudo fully differential amplifier can keep the output common-mode level stable in low-voltage and low-power application occasions.

Description

technical field [0001] The invention relates to the field of low-voltage and low-power circuit design, in particular to an inverting pseudo full-differential amplifier with a common-mode feedback control circuit and a method for maintaining stable output common-mode levels. Background technique [0002] Fully differential amplifiers are widely used in high-precision analog circuit applications, such as data converters, sensor signal processing, and small signal processing. It has the characteristics of strong anti-interference ability and large signal swing. However, due to the deviation caused by the manufacturing of the devices, it is impossible to achieve 100% matching characteristics between the devices, making it difficult to determine the output common-mode level of the amplifier, which may cause the amplifier to enter the dead zone and greatly reduce the signal processing range. Therefore, the fully differential amplifier must have a common-mode feedback circuit to m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45
CPCH03F3/45179H03F3/45654H03F2203/45551H03F2203/45514H03F1/0205H03F3/45659H03F3/45475H03F3/005H03F2203/45062H03F2203/45332H03F3/45269H03F2200/129H03F2203/45116
Inventor 何洋侯佳力胡毅冯曦李映雪朱文广
Owner BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY
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