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Differential operational amplifier circuit and electronic equipment

A differential op amp, differential amplifier technology, applied in differential amplifiers, amplifiers with semiconductor devices/discharge tubes, amplifiers, etc., can solve the problem that the common mode feedback network cannot output a stable common mode level, etc.

Pending Publication Date: 2022-05-17
HUNAN GOKE MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a differential operational amplifier circuit and electronic equipment to solve the problem that the common-mode feedback network cannot output a stable common-mode level

Method used

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  • Differential operational amplifier circuit and electronic equipment
  • Differential operational amplifier circuit and electronic equipment
  • Differential operational amplifier circuit and electronic equipment

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0029] The components of the embodiments of the invention 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 invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0030] Hereinafter, the terms "comprising",...

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Abstract

The embodiment of the invention discloses a differential operational amplifier circuit and electronic equipment, the differential operational amplifier circuit comprises a differential amplifier and a common-mode feedback circuit, and the common-mode feedback circuit comprises a bias sub-circuit, a first resistor and a second resistor; one end of the common-mode feedback circuit is connected with the power input end, and the other end of the common-mode feedback circuit is connected with the power output end; the bias sub-circuit comprises a first bias tube and a second bias tube, an input end of the differential amplifier is connected with a differential signal input end, a first output end of the differential amplifier is connected with the first bias tube, and the first output end of the differential amplifier is connected with the first bias tube through a first resistor; the second output end of the differential amplifier is connected with the second bias tube, and the second output end of the differential amplifier is connected with the second bias tube through the second resistor. Common-mode feedback is achieved in a resistor detection mode, rapid response can be conducted on the basis that the circuit structure is simplified, and the high-speed signal amplification circuit is suitable for various high-speed signal amplification scenes.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a differential operational amplifier circuit and electronic equipment. Background technique [0002] The fully differential operational amplifier circuit is an integrated circuit that converts single-ended signals into differential signals, or converts differential signals into differential signals. It has the characteristics of low noise, effective suppression of common-mode noise, and large output voltage swing. [0003] In a high-gain fully differential operational amplifier circuit, the output common-mode level is highly susceptible to device characteristics and mismatch. In addition, the fully differential operational amplifier circuit cannot stabilize the DC operating point through the negative feedback of the differential signal. It is usually necessary to add a common-mode feedback network to detect the common-mode level output by the fully differential operational amp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
CPCH03F3/45488
Inventor 陈婷胡眺胡万成汤雪川陈出新
Owner HUNAN GOKE MICROELECTRONICS
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