Hey, I have a Wheatstone bridge, and I plan on using a differential amplifier. The frequency of the signal that I am using is around 400kHz, sine wave.
I created a differential amplifier using a general purpose op-amp, and found out that I need to use higher resistance of around 300Kohm in order to not affect the input signal.
I have looked at most differential amplifier online, and found out that at higher frequency bandwidth, the differential amplifier uses lower resistance as shown below.
Is there a differential amplifier that uses resistance of above 100kohm for 400Khz signal operation?
Hello Shurp,
How are you?
You may want to check out LT1991 - it uses 450kohms resistance with 560kHz BW (G=1).
There is a tool for it if you want to explore and simulate in LT Spice - LT1991 Beta Tool
I hope it helps.
That's all,
Sham
Hi,
Lower gains can operate up to the MHz-range but unfortunately for G=1000, highest BW is up to 150kHz only.
Another solution you can try is to use discrete circuits - differential amplifier + resistor network.
You can check LT5400-2, a quad matched resistor network.
Best Regards,
Sham
Hi,
Lower gains can operate up to the MHz-range but unfortunately for G=1000, highest BW is up to 150kHz only.
Another solution you can try is to use discrete circuits - differential amplifier + resistor network.
You can check LT5400-2, a quad matched resistor network.
Best Regards,
Sham