Compiler/OPA657: regarding creation of phoodiode.

sumanth Korati

Part Number: OPA657

Tool/software: TI C/C++ Compiler

Hi Guys

I need to achieve bandwidth of 200Mhz using S5973 PHOTODIODE AND OPA657 OPAMP in transimpedance circuit.im having a problem in creating a S5973 photodiode in simulation, could anyone can help on this.

thanks

over 4 years ago

0 Hasan Babiker31 over 4 years ago

TI__Genius 15555 points

Hello Sumanth,

Could you clarify what problems you are running into? What parameters of the photodiode are you trying to simulate?

Best,

Hasan Babiker

0 kai klaas69 over 4 years ago

Guru 140200 points

Hi Sumanth,

the usual way is to draw the equivalent model of photodiode which is a current source in parallel with a capacitance representing the detector capacitance (in your case 1.6pF) and in parallel with a high ohmic resistance representing the leakage current of photodiode (in your case 10V / 100pA = 100G). Sometimes, this parallel resistance of photodiode is assumed to be infinite and can be omitted then.

Kai

0 sumanth Korati over 4 years ago in reply to Hasan Babiker31

Prodigy 90 points

Hi Hasan

I need to create a new S5973 photodode in multisim. but i need the subckt model for this. where can i get the model? could you please help me out in this.

thanks

0 sumanth Korati over 4 years ago in reply to kai klaas69

Prodigy 90 points

Hi Kai

Thanks for the Reply. but how can i create my new photodiode model in multisim, S5973? any idea on this?

Thanks

0 kai klaas69 over 4 years ago in reply to sumanth Korati

Guru 140200 points

Hi Sumanth,

exactly as I explained above.

Kai

0 Hasan Babiker31 over 4 years ago in reply to sumanth Korati

TI__Genius 15555 points

Hello Sumanth,

If a manufacturer does not have a spice model for the part, I would suggest using Kai highlighted.

Best,

Hasan Babiker

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Compiler/OPA657: regarding creation of phoodiode.