Small signal amplification

860208cnn

Small signal amplification [Copy link]

I want to amplify the differential small signal output by the pressure sensor 0~4mV (common mode 1.5V) to 0~200mV. I have used several instrumentation op amps. The gain is very small for small signals (below 700uV). Has anyone done this before? Please feel free to give me some advice. [ This post was last edited by 860208cnn on 2010-1-30 17:27 ]

jxb01033016

AD620AN try

jxb01033016

But I haven't looked at it carefully, it is recommended to use a three-terminal common mode circuit

860208cnn

Thanks to the moderator. What should I pay attention to when choosing an instrument op amp? Vio has not made a board yet, only tested on a breadboard. In addition to the power supply decoupling and differential input terminals connected to filter capacitors, is there anything else I need to pay attention to? ? ? Has anyone used an instrument op amp to make an electronic scale?

simonprince

Give you a picture reference

leang521

It is very common to amplify the micro signal. Generally, differential amplification is used to build a resistor bridge.

jxb01033016

24-bit AD, not cheap, right????!!! Generally, it is recommended to use differential amplification, see

yulzhu

In order to prevent thermal noise and error, it is recommended that the AD620 with built-in gain resistors be external resistors. The selection of gain resistors is required to be high. It is best to use thin film chip resistors.

leang521

Originally posted by yulzhu on 2010-2-2 19:16 In order to prevent thermal noise and error, it is recommended that the AD620 with built-in gain resistors is an external resistor. The selection of gain resistors is required to be high. It is best to use thin film chip resistors

It is an instrument op amp. I use it. In fact, the key lies in the control of ground noise, otherwise such a small signal will be covered by noise. H bridge.