OPA4330: Output waveform bias

Timsen

Part Number: OPA4330

Dear all:

When I use OPA4330 operational amplifier, waveform bias occurs when I add sine signal abruptly. The following are circuit diagram and waveform diagram

Please look it up and give me some advice?

over 4 years ago

0 Shreenidhi Patil over 4 years ago

TI__Expert 3126 points

Can you please explain the sentence

"waveform bias occurs when I add sine signal abruptly"

0 kai klaas69 over 4 years ago

Guru 140200 points

Hi,

how stable is Vref2.5?

And is there any additional filtering in the signal path?

Please also show scope plots from the input signal and Vref2.5.

Kai

0 Timsen over 4 years ago in reply to Shreenidhi Patil

Expert 1660 points

The input signal is an analog sinusoidal wave with a frequency of 50Hz and an adjustable amplitude. The input signal goes IN from IN+ and the reference is 2.5v.When I pass in the input signal (the input signal mutates), the output signal will drift for the first few cycles.Why?

0 Timsen over 4 years ago in reply to Shreenidhi Patil

Expert 1660 points

Hi Shreenidhi:

Any Suggestions?

0 Timsen over 4 years ago in reply to kai klaas69

Expert 1660 points

Hi Kai:

0 Michael Steffes over 4 years ago in reply to Timsen

Guru 47535 points

This is probably that input cap to Vref finding a new average DC level in the first few cycles.

0 Timsen over 4 years ago in reply to Timsen

Expert 1660 points

Vref2.5 voltage stability, circuit simulation results, when the input signal frequency below the cut-off frequency does not appear this phenomenon.Why?

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OPA4330: Output waveform bias