TLV9061: Self Noise / Output noise

Romain Bricknall

Part Number: TLV9061
Other Parts Discussed in Thread: LMP7731, TLV6741

Tool/software:

Hello, We have designed a 3mm microphone capsule and need to bring the self noise down another 10fb, preferably to around -120db. This Jfet looks potentially viable, however I cannot find any output noise data. Can you please advise what is the self noise of the TLV9061? If you have another product that is better suited, please advise.

Cheers

Romain

4 months ago

0 Ron Michallick 4 months ago

TI__Guru**** 157416 points

Hello Romain, welcome to the TI e2e forums.

TLV9061 is not a JFET. Typical noise is here in data sheet.

TLV6741 or LMP7731 would be lower noise.

0 Romain Bricknall 4 months ago

Prodigy 10 points

Hi Ron,

Thank you, however my question was regarding the output noise, the self noise, not the input.

0 Ron Michallick 4 months ago in reply to Romain Bricknall

TI__Guru**** 157416 points

Romain,

Output noise = input noise * Gain. (loop gain = RF/RI +1 )

0 Romain Bricknall 4 months ago in reply to Ron Michallick

Prodigy 10 points

Thank you Ron, things I am learning. That said, looking at the data sheet, I'm confused with the values required. There are three noise values and four for open loop gain. Could you please provide an example using these fir a final output nouse value?? Not sure where the F value is. Sorry for being a noob.

Cheers