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
