Current feedback type instrument amplifier with low power consumption and low noise

An instrumentation amplifier, current feedback technology, applied in amplifiers, DC-coupled DC amplifiers, differential amplifiers, etc., can solve the problems of high noise and high power consumption, achieve chip area reduction, small chip area and cost, reduce power consumption and effect of noise

CN106411269AActive Publication Date: 2017-02-15GUILIN UNIV OF ELECTRONIC TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-02-15

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Abstract

The invention discloses a current feedback type instrument amplifier with low power consumption and low noise. The amplifier is composed of an input preprocessing circuit I0, an operational transconductance amplification circuit I1 and a capacitive feed-back network I2, wherein the operational transconductance amplification circuit I1 comprises an input transconductance branch circuit and a feed-back transconductance branch circuit. Under the condition of same transistor length, the width to length ratio of an input transconductance difference transistor pair, namely a PMOS transistor PM10 and a PMOS transistor PM11, is N times of the width to length ratio of a feed-back transconductance difference transistor pair, namely a PMOS transistor PM12 and a PMOS transistor PM13, and the width to length ratio of a bias transistor pair, namely a PMOS transistor PM14 is N times of the width to length ratio of a PMOS transistor PM15, wherein N is greater than 1. By geometric scaling of the current of the feed-back transconductance branch circuit and the width to length ratio of the transistors of the feed-back transconductance branch circuit, the power consumption and noise of the current feedback type instrument amplifier are reduced.
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Description

technical field

[0001] The invention relates to the technical field of integrated circuit design, in particular to a low-power consumption and low-noise current feedback instrumentation amplifier. Background technique

[0002] With the rapid development of biomedical sensing technology and integrated circuit technology, more and more portable wearable devices are powered by batteries. The development of integrated circuits with low power consumption and low noise is the basis for realizing high-quality and durable portable electronic systems. And the urgent need, low power consumption and low noise design is an important optimization design goal of portable electronic equipment.

[0003] For the noise and DC offset problems faced by biomedical low-frequency signal acquisition in wearable devices, the current common method is to use techniques such as chopping to optimize performance. The common-mode offset voltage in biomedical signal processing can be suppressed by the DC ...

Examples

Embodiment Construction

[0020] A low-power, low-noise current-feedback instrumentation amplifier, such as figure 1 As shown, it includes input preprocessing circuit I0, operational transconductance amplification (OTA) circuit and capacitive feedback network I2. The non-inverting input terminal VIP0 of the input pre-processing circuit I0 forms the non-inverting input terminal VIP of the amplifier, and the inverting input terminal VIN0 of the input pre-processing circuit I0 forms the inverting input terminal VIN of the amplifier. The differential in-phase output terminal VOUTP0 of the input preprocessing circuit I0 is connected to the in-phase differential input terminal VIP1 of the OTA circuit I1. The differential inverting output terminal VOUTN0 of the input preprocessing circuit I0 is connected to the inverting differential input terminal VIN1 of the OTA circuit I1. The non-inverting feedback input terminal VFBP of the OTA circuit I1 is connected to the non-inverting output terminal VOUTP2 of the c...