TINA/Spice/TIDA-060025: TINA/Spice/TIDA-060025

David Peter16

Part Number: TIDA-060025
Other Parts Discussed in Thread: TINA-TI, OPA858, TLV3501

Tool/software: TINA-TI or Spice Models

Simulating the TIA (OPA858) and comparator (tlv3501) and not obtaining results as excepted. As individual circuit the simulation is good though once theTIA and the comparator circuits are combined the simulation fails.

OUTPUT: TIA and Comparator separated

OUTPUT: TIA and Comparator combined

over 6 years ago

0 Hasan Babiker31 over 6 years ago

TI__Genius 15555 points

Hey David,

I havent gotten the chance to simulate this yet. But it looks like you have the inverting and non-inverting pins of the OPA858 switched.

Best,
Hasan Babiker

0 David Peter16 over 6 years ago in reply to Hasan Babiker31

Prodigy 60 points

PD_Common_C_w_comp.TSCThanks Hasan though the TIA is configured as an inverting. Looking at the "OUTPUT: TIA and Comparator separated" waveform the TIA is operating properly. It is when the TIA is connected to the comparator that the simulation of the TIA fails. I attached circuit file

0 Hasan Babiker31 over 6 years ago in reply to David Peter16

TI__Genius 15555 points

Hey David,

Feedback should be between the output and the inverting node for both inverting and non-inverting configurations. I've attached an updated version of your schematic, you will see the expected results:

PD_Common_C_w_comp(1).TSC

Best,

Hasan Babiker

0 David Peter16 over 6 years ago in reply to Hasan Babiker31

Prodigy 60 points

Thanks Hasan

Duh.. I know better.. If you look at something wrong long enough it looks correct..

Simulation, hardware & system design tools

Simulation, hardware & system design tools forum

TINA/Spice/TIDA-060025: TINA/Spice/TIDA-060025