You can probably get around that limitation by editing the spice lines using, but I’m not sure and why bother. Do not instantiate the 3-terminal nmos or pmos, because those come without the W and L parameters. If you want to edit W and L, instantiate (F2) nmos4 or pmos4, the monolithic 4-terminal MOSFETs. Move parameters like you move anything else: F7, then click what you wish to move. The model name does not seem editable with a right-click, but it is editable with a. A PNP4 may be undesirable, since it has 4 terminals and you may mean for the collector to be the substrate. NGspice's List of Other Spices (External Link) savebias.Ĭontinue savebias/loadbiase with gradually lower series R's, tighter tolerances, and less over-compensation until you get convergence for under acceptable conditions.ĭo not remove large caps or overcompensation from portions of the circuit that are not meant to respond to the AC stimulus. OP with slightly less series R's or slightly tighter tolerances. savebias internal and.loadbias to initialize a 2nd. If you loosen these enough, you will converge.Īfter getting convergenc, use. Loosen tolerances and Gmin as much as necessary.
Add caps to nodes that may benefit from them. Sometimes I still need to lower the tolerances for the AC to converge. OP to converge, and savebias internal to a file. In AC analysis of an amp with feedback in LTspice, using a reference DC amp and another copy with an AC stimulus, I have gotten convergence by:ĭouble-check no stupid mistakes, such as floating nodes, shorts, or feedback going to the wrong amp input.įirst get.
Uninstall qucs pdf#
This PDF is for Berkeley Spice3 but may apply quite well to the Spice you use. U of Exeter's Electronics Resources Page (External Link)
Uninstall qucs manual#
U of Exeter Berkeley Spice3 Manual (External Link) Promises to make IRSIM (logic simulator) available soon Includes free Berkeley spice, Hspice, Pspice, free Magic (layout). LayTOOLS - A comprehensive design, sim, & layout suite (External Link) VHDL: Ashenden's Tutorial (External Link)Įlectric - Schematic capture & layout - FREE!
Verilog (Note some items listed elsewhere may include Verilog) Spice, Schematic Capture, & Logic Sim Combined Note: LTspice is highly recommended for schematic capture and SPICE. LTspice (Linear Technology's tremendous free schematic capture & spice program) - FREE! Links either scroll to my notes or open an external webpage: * SPICE * Schematic Capture * Verilog * VHDL * Layout * Steve's Notes on Simulation & Design Tools
0 kommentar(er)
