On Thu, Dec 26, 2024 at 08:06 AM, Andy I wrote: I would think that a non-Op-Amp would be needed in that case, perhaps a diff amp with a preset gain of 1 or 2. The term "OpAmp" is misused by me. TI and

I didn't use the "ideal" diode so even the minuscule capacitance was causing issues. The LTspice ideal diode is very similar to the XSPICE simple diode code model.

Yes there are multiple types of "Fully-Differential Amplifiers". There is no set minimum requirements. For the case of feeding a differential ADC, a "true" Fully-Differential OpAmp is generally used.

Having issues making a current source with limited voltage compliance for an ideal charge pump in a PLL circuit. The methods of clamping the Source max Vc using a diode and voltage source or Zener dio

It takes 3 sources to make a DI/DO amp with CM ref. I tested both E and G sources. Oddly if the 4 feedback resistors are all equal you can swap the output connections and the circuit still works. That

Screen shot of Delta-Sigma Converter uploaded

It's primary use is for XSPICE mixed-mode simulations. For XSPICE the key is simplicity so simulation times are reasonable. I needed something quick to replace the original code model used in a Sigma-

This seems to work. G=100MEG seems a bit much. * Ideal Fully Differential OpAmp * https://groups.io/g/LTspice/topic/50198770#msg46663 * .subckt D_OpAmp inp inn outp outn vcm R1 outp n01 1 R2 n01 outn

Correct. Something simple that won't have any convergence issues.

On Sun, Dec 22, 2024 at 10:17 AM, John Woodgate wrote: What I mean is that there are few real-life BIBO opamps,from which SPICE models with real-life features, such as offset and PSRR could be produce

Here is the thread I found on fully diff OpAmps https://groups.io/g/LTspice/topic/50198770#msg46663

On Sun, Dec 22, 2024 at 08:46 AM, John Woodgate wrote: Yes, because it's quite easy, and probably cheaper, to use 2 or 3 sections of a quad opamp to make a good balanced-in/balanced-out circuit. XSPIC

A model that would work for both LTspice and any Spice 3 simulator. The model will also be used in mixed-mode simulations with XSPICE models.

The generic Spice model would be usable in LTspice or Spice programs that support XSPICE. I found 2 on this forum from 2011 using various search terms. There are many choices for an generic OpAmp with

Looking for ideal fully differential amplifier spice model for XSPICE simulations. The one I have based on the XSPICE "gain" code model doesn't have any CMRR or care if outputs are swapped. Anything b

https://sanjayvidhyadharan.in/wp-content/uploads/2022/01/Installation-of-180-nm-TSMC-CMOS-in-LT-SPICE.pdf

The Heptode.asy I downloaded last week is wrong. I updated it to match Koren_Tubes_23.cir and added pin labels. I did not check Hexode.asy for accuracy. I have a EH90 mixer/oscillator simulation semi

Holger at ngspice made the following observation: "There is a bug in the Koren model description. The correct node sequence is .SUBCKT HEXODE 1 2 3 4 5 ; A G2 G1 C G3 with G1 and G3 the controlling gr

Suusi Has the EH90 Heptode model in Koren_tubes.cir been tested? I cannot get it to work generating V/I curves. The line below is generating log of a negative number. G2 2 4 VALUE={(EXP(EX*(LOG((V(2,4

The goal was to come up with a viable method to do thermal analysis on devices lacking Spice thermal models and to use as an example for users who have never done it before. Since many parameters are