Hi!
I am a LTSpice novice who is looking to simulate a CD4009 chip for a linear application. Specifically, in the electronotes newsletter #111, it is hinted that these can be used to make a simple VCA. My very naive approach has been to just copy down the arrangement of NMOS and PMOS shown on the CD4009 datasheet as shown, without tweaking any parameters or selecting "pick new transistor". The circuit I am trying to simulate seems to qualitatively do what it is supposed to after some tweaking, but with the RC values and and supply voltage as shown in the original schematic, it does not achieve nearly the performance claimed. I am wondering if there is any way to select NMOS and PMOS parameters to improve my simulation's accuracy to the actual CD4009. Any help is much appreciated!
see files:
Eli_R_CD4009_VCA_Question.asc?and photo album
Eli_R_CD4009_VCA_Question
datasheet:
[Moderator's note:? The original Subject said "CD4007", but the body of the message refers only to "CD4009".? I have modified the Subject line to suggest the CD4009.]
