| Electronics > Projects, Designs, and Technical Stuff |
| low Signal amplification ? |
| (1/3) > >> |
| namster:
Hi, I want to amplify a signal that has a full scale of 20mV, the major problem is the bottom of the signal (bellow the offset of Amplifier), I use a 4 wire Kelvin measurements, the two methods I think about is: 1 - a non inverting Amplifier with Jfet input like 34420a and a DAC For offset compensation 2- an Instrumentation Amplifier ( Like AD8552 with 1 µV Offset ) so how can I amplify a voltage of 10µV with a gain of 350! |
| Marco:
How about just using a MAX4209 and manual zero'ing to get rid of the final offset? |
| dom0:
Bandwidth? Acceptable offset error? Also --- Quote ---a full scale of 20mV --- End quote --- vs --- Quote ---mplify a voltage of 10µV with a gain of 350! --- End quote --- Those numbers are four orders of magnitude apart. |
| _Wim_:
If bandwidth is low, typically a chopper-stabilzed (CMOS) opamp is recommended for this application |
| _Wim_:
--- Quote from: dom0 on October 25, 2019, 07:20:49 pm ---Those numbers are four orders of magnitude apart. --- End quote --- I think he means the smallest expected input signal for the amplifier is 10µV, the largest is 20mV, both will be amplified with a gain of 350. The small signal has a high risk to be swamped by the offset voltage due to temperature variations |
| Navigation |
| Message Index |
| Next page |