Jim Thompson said :
"Use a subcircuit... make from electret data sheet"
This is exactly that I hope to obtain : a subckt of electret micro.
I don't know real it.
As in (diaphragm only, needs FET, of your choice, added)....
*** EDITED for PSpice by JET, 7/7/2005 ***
*M154_Correlated - 8.63um Effective Gap, 45um Vent Holes
*
* .PARAM VBIAS = 4.2
* .PARAM PHI = {0.07439*VBIAS}
*
* V_NOISE MIC_IN_PLUS MIC_IN_MINUS SIN(0 {1/PHI} 1000) AC {1/PHI}
* XSINGLE_DIAPHRAGM_1 BACKVOLUME MIC_IN_PLUS GND MIC SINGLE_DIAPHRAGM
*
C_BV BACKVOLUME MIC_IN_MINUS {3.5123e-014*PHI**2}
*
..SUBCKT SINGLE_DIAPHRAGM IN_MINUS IN_PLUS OUT_MINUS OUT_PLUS
*
..PARAM VBIAS = 4.2
..PARAM PHI = {0.07439*VBIAS}
C_O OUT_PLUS OUT_MINUS {1.5278e-013}
C_P_ANCHOR OUT_PLUS OUT_MINUS {1.65e-013}
C_D NET3 OUT_PLUS {1.2622e-014*PHI**2}
L_D NET1 NET3 {19029.7355/PHI**2}
L_L NET1 NET4 {34.9782/PHI**2}
R_L NET4 OUT_MINUS {14453781512.605/PHI**2}
R_G OUT_MINUS NET5 {97987627.0912/PHI**2}
R_V NET6 NET7 {103327939.9914/PHI**2}
L_G NET5 NET6 {313.025/PHI**2}
L_V NET7 IN_MINUS {543.2099/PHI**2}
L_R IN_PLUS NET1 {1038.0656/PHI**2}
** R_R NET1 NET2 {0/PHI**2}
; HUH? ...Renamed NET2 = NET1
*
..ENDS SINGLE_DIAPHRAGM
** As is, no warranties, or other assistance available ;-)
...Jim Thompson
