High-precision fully differential amplifier based on chopper technology

A fully differential amplifier, high-precision technology, used in differential amplifiers, DC-coupled DC amplifiers, and improved amplifiers to reduce noise effects. It can solve problems such as signal band noise, eliminate noise, reduce mismatches, and improve bandwidth. Effect

Inactive Publication Date: 2013-11-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The traditional A / D converter is mainly composed of analog circuits, the matching error of circuit components has a great influence on the accuracy of the A / D converter, and will introduce noise in the signal frequency band

Method used

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  • High-precision fully differential amplifier based on chopper technology
  • High-precision fully differential amplifier based on chopper technology
  • High-precision fully differential amplifier based on chopper technology

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0024] In the design of a fully differential operational amplifier, compared with the single-ended working state, the advantages are that it can effectively suppress common-mode noise, larger output voltage swing, simpler bias circuit, and higher output linearity. Ideally, a fully differential op amp can achieve very high precision. However, in practical applications, due to the mismatch of differential pair tubes, current mirroring errors, and other undesirable characteristics in the low-frequency or DC noise range, offset voltage and 1 / f noise will be introduced at the differential input. In high-gain amplifiers, the output common-mode level is quite sensitive to device characteristics and mismatches, and cannot be stabilized by differential feedback, so common-mode feedback is required for high-gain differential circuits. Compared with traditional sampling...

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Abstract

The invention relates to integrated circuit technologies, particularly to a high-precision fully differential amplifier based on a chopper technology. A common-mode feedback technology and the chopper technology are used for reducing offsets and noises. The common-mode feedback technology and the chopper technology are mainly used in the high-precision fully differential amplifier based on the chopper technology, a chopper module is composed of two multipliers and two operational amplifiers, wherein two of the multipliers and the operational amplifiers are controlled by the same clock, an input signal VIN enters the first multiplier for modulation, the modulated signal enters the first operational amplifier for amplification, the output signal enters the second multiplier for modulation after reversing, and the finally-modulated signal enters the second operational amplifier for recovery and amplification. Compared with an existing fully differential amplifier circuit, the high-precision fully differential amplifier based on the chopper technology has the advantages of achieving low noises, low offset voltages and high precision in a frequency band due to the fact that the common-mode feedback technology and the chopper technology are utilized.

Description

technical field [0001] The invention relates to integrated circuit technology, in particular to a high-precision full differential amplifier based on chopper technology, which uses common-mode feedback technology and chopper technology to reduce offset and noise. Background technique [0002] With the development of analog integrated circuit technology, high-speed and high-precision operational amplifiers are widely used. Fully differential operational amplifiers have great advantages over single-ended output operational amplifiers in terms of output swing and input dynamic range, and become a widely used circuit unit. However, the fully differential operational amplifier has the problem of unstable output common-mode level, and it is necessary to design a common-mode feedback circuit to ensure the normal operation of the operational amplifier. Common-mode feedback is often used in two ways: one way is to use a resistor to detect the output common-mode voltage, but this way...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/26
Inventor 周泽坤段茂平张晓敏石跃明鑫王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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