Selection of differential amplifier

Vamshi Gondrala

Other Parts Discussed in Thread: THS3215, VCA824

I want to drive single ended adc with a differential input. So, I am looking for amplifier which can convert my differential signal to single ended one preferably that can work with 5v supply

My input frequencies will be around 100 MHz.

over 4 years ago

0 Michael Steffes over 4 years ago

Guru 48395 points

Obviously not enough detail to drill down to best fit, but, if you can use higher supplies, look at these two

THS3215

VCA824 (fixed at max gain).

Both have degraded HD by 100Mhz, but you may not care.

0 Vamshi Gondrala over 4 years ago in reply to Michael Steffes

Prodigy 30 points

Thanks michael for the reply.

My circuit is as shown below. Mostly my amplifier will be powered by MCU. Hope this will give you better details

0 Michael Steffes over 4 years ago in reply to Vamshi Gondrala

Guru 48395 points

Kind of a peak detector?

Perhaps the bandwidth at the diff amp does not need to be 100Mhz, what is your ADC clk rate?

0 Vamshi Gondrala over 4 years ago in reply to Michael Steffes

Prodigy 30 points

Yeah it is a peak detector..

But the other end of capacitor is not grounded.

My ADC sampling rate is around 1Msps

0 Michael Steffes over 4 years ago in reply to Vamshi Gondrala

Guru 48395 points

You might consider an INA at these lower frequencies

Amplifiers

Amplifiers forum

Selection of differential amplifier