TINA Simulation for an LM833

Richard Meidl

Other Parts Discussed in Thread: LM833, OPA1652, LM833-N, TINA-TI

I want to run some TINA simulations for noise for an LM833 amplifier circuit. I cannot find an LM833 in the TINA library. Is there another part that is in the TINA parts library that is close to the LM833?

Thanks,

Rich

over 12 years ago

0 Ron Michallick over 12 years ago

TI__Guru**** 174826 points

Richard,

I am not aware of a similar model especially for noise analysis.

0 Hooman Hashemi over 12 years ago in reply to Ron Michallick

TI__Mastermind 22825 points

Hello Ron and Richard,

OPA1652 noise (4.5nV/RtHz, 0.5pA/RtHz, 1/f corner around 1kHz) is fairly close to that of LM833-N (4.5nV/RtHz, 0.7pA/RtHz, 1/f corner around 100Hz). The higher 1/f corner frequency of the OPA1652 may result in a slightly higher noise reading especially if you are band limiting to audio, for example. The difference would be less important if you are looking at extended bandwidths.

You might be able to use it for rough simulation purposes:

OPA1652 TINA-TI reference Design: http://www.ti.com/litv/tsc/sbom737

Entire TINA-TI reference page: http://www.ti.com/adc/docs/midlevel.tsp?contentId=55102

Regards,

Hooman

0 Hooman Hashemi over 12 years ago in reply to Hooman Hashemi

TI__Mastermind 22825 points

Hello Again,

OPA1652 is a FET-input device (100pA maximum input bias current) and I'm doubting the validity of the datasheet current noise density (0.5pA/RtHz), and hence the TINA-TI moel for it, since most FET input devices have input current noise in the fA/RtHz!

Just beware of that in case you are working with a large source resistance (>5kohm) which could result in your LM833-N current noise component to approach your voltage noise value. Large feedback resistors could have the same effect. Without these factors, your noise is dominated by voltage noise and the two devices should be close.

Regards,

Hooman