THS2630: Need updated SPICE model

John Willison

Part Number: THS2630
Other Parts Discussed in Thread: THS4131,

Tool/software:

Hello,

I am using LTSPICE to evaluate the noise performance of the THS4131 vs. the THS2630. To verify the SPICE models for the parts I configure them for a gain of x1, in a balanced, differential configuration, with 402 Ohm source and feedback resistors all around. I measure a differential output noise (+OUT minus -OUT) of 117 nV/rtHz at 10 Hz and 13.2 nV/rtHz at 1 kHz. This is much larger than expected, and, suspiciously, exactly the same for both parts. (In particular, the 1/f knee for the THS2630 should be at a much lower frequency than that of the THS4131, per their datasheets).

Headers for the two SPICE models are given here:

* THS4131 SUBCIRCUIT
* FULLY DIFFERENTIAL HIGH SPEED MONLITHIC OPERATIONAL AMPLIFIER
* WRITTEN 9/18/00

and,

* THS2630 - Rev. A
* Created by Ignacio Vazquez Lam; 2022-11-07
* Created with Green-Williams-Lis Current Sense Amp Macro-model Architecture
* Copyright 2022 by Texas Instruments Corporation

I would greatly appreciate an updated SPICE model for the THS2630!

Thank you for your help,

John

23 days ago

0 Ignacio Vazquez Lam1 23 days ago

TI__Expert 8750 points

Hi John,

Although we can't assist with simulation results involving LTSpice could you please attach a schematic image of the you are using to get the results you are getting? Having the same exact noise simulation result for the two parts is an interesting behavior.

Best Regards,

Ignacio

+1 John Willison 3 days ago

Prodigy 130 points

Ignacio,

This mis-understanding was entirely my fault. There is no apparent problem with the THS2630 SPICE model.

(It was a rookie's error. My symbol edited file for the THS2630 schematic symbol was pointing at the THS4131's SPICE model.)

Sorry for the trouble, and thank you for your help.

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THS2630: Need updated SPICE model