RC4580-Q1: Phase margin measurement

Youhei Miyaoka

Expert 4975 points

Part Number: RC4580-Q1

Tool/software:

Hi team,

Could you teach me how to measure phase margin in this device.

Regards,

Youhei MIYAOKA

over 1 year ago

0 Ron Michallick over 1 year ago

TI__Guru**** 169426 points

Hello Miyaoka-san,

Do you mean in simulation or on a lab bench? If lab, what equipment is available?

0 Youhei Miyaoka over 1 year ago in reply to Ron Michallick

TI__Expert 4975 points

Hi Ron,

I mean on a lab bench. We have FRA.

I need to measure the customer board.

Regards,

Youhei MIYAOKA

0 Ron Michallick over 1 year ago in reply to Youhei Miyaoka

TI__Guru**** 169426 points

Miyaoka-san,

I do not know the meaning of FRA. Can you expand the acronym?

0 Youhei Miyaoka over 1 year ago in reply to Ron Michallick

TI__Expert 4975 points

Hi Ron,

I wanted to express Frequency Response Analyzer.

+1 Ron Michallick over 1 year ago in reply to Youhei Miyaoka

TI__Guru**** 169426 points

Miyaoka-san,

This simple circuit will work. The FRA should show the gain and phase versus frequency. The phase at the point where gain = 0dB is the unity gain phase margin. Use a small signal for accuracy but large enough to reduce noise in the measurement.

0 Youhei Miyaoka over 1 year ago in reply to Ron Michallick

TI__Expert 4975 points

Hi Ron,

Thank you. I got it.

Regards,

Youhei MIYAOKA

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RC4580-Q1: Phase margin measurement