AMC1301-Q1: Gain boosting from DC signal to AC signal of 1kHz and above

Hi Manuraj,

Welcome to our E2E forum!  What sort of gain peaking are you seeing with the AMC1301?  It should stay pretty flat through 200kHz,

Hi Tom,

Thanks for your replay,

I have applied 500mV (+250 - -250mV) at the input, at 2kHz, and we should get 500mV x 8.2 = 4.1Vpp, as the gain of the amplifier is given as 8.2 in datasheet.

But we are getting 4.6Vpp, means the gain is 9.2...

This is not happening if the signal frequency is around 100Hz or a DC..

Hope you can visualize the problem now..

Thanks and Regards,

Manuraj MR

Hi Manuraj,

Can you post a schematic of your setup?  Is this a current sensing application or are you trying to measure an AC voltage source?

Hi,

Find the schematics attached,

Using for sinusoidal current sense application, of 2kHz

Regards,

Manuraj MR

Hi Manuraj,

I cannot see a schematic. Please post again and use the "Insert File" button (paper clip).

Kai

Hi,

PFA

Hi Manuraj,

Making the assumption that there is a tie dot at the GND node of the Zener and VINN.   Are you looking at the output voltage differential at VOUTp and VOUTn or at the output of the OPA365?  The 200E resistor is going to cause some error due to the bias current associated with the AMC1301.  Please reduce that to 10 or 20 ohms and see if that gives you an improvement.