THS4521: the noise of DC220V

user4973896

Part Number: THS4521

hello，smart TI engineer，Is there a reference design that can sample the noise of DC220v power？assume the high frequency of the noise is 40M, and the amplitude of the noise is 10V,i want to use THS4521 OP or Other more suitable op amps ,can somebody advise a circuit to me ？

over 7 years ago

0 Sean Cashin over 7 years ago

TI__Mastermind 23226 points

Hi user4973896,

A low noise, single ended, high voltage amplifier may be more suitable than a high speed amplifier like the THS4521. I am transferring this to the Precision Amplifiers group.

Best regards,

Sean

0 kai klaas69 over 7 years ago in reply to Sean Cashin

Guru 140200 points

This issue is also discussed here:

e2e.ti.com/.../715062

Kai

0 Thomas Kuehl over 7 years ago

TI__Guru* 93105 points

Hi user4973896,

Is there a reason that an amplifier would be required for this application? It would seem that a passive high-pass filter could be used to effectively separate the 10 V, 40 MHz noise, from the 220 V, 50 Hz line voltage. A ten volt signal is quite large and may be suitable for the required purpose without amplification.

If for some reason the signal must be amplifier or conditioned, then a wide-bandwidth operational amplifier would be required. Unfortunately, the Precision Amplifiers op amps are limited to gain-bandwidth of 50 MHz so they really aren't suitable for a 40 MHz application.

Regards, Thomas
Precision Amplifiers Applications Engineering

0 Dennis Goeke over 7 years ago in reply to Thomas Kuehl

TI__Genius 11135 points

user4973896

We haven't heard back from you so we assume this answered your question. If you need additional help just post another reply below.

Thanks
Dennis

0 user4973896 over 7 years ago in reply to Dennis Goeke

Expert 1555 points

ok，my board is being made now ，maybe i will have ohter question in the future ，just help me save this thread！THANK!

0 Dennis Goeke over 7 years ago in reply to user4973896

TI__Genius 11135 points

user4973896

The threads never go away but they do get locked after a few weeks...if that happens just start a new thread and reference this one.

Regards
Dennis

Amplifiers

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THS4521: the noise of DC220V