VCO SPICE model

Hi all,

I have a school project to do and (and I don't know why) but we have to use an LM566 VCO for a frequency modulator. This is an old and obsolete chip (about six or seven years now). The problem is that we need a working SPICE model too and lo and behold I cannot find ANY VCO model anywhere on the net. Does anyone have the LM566 model or any VCO model that I may use in my project?

thanks in advance

Tim

In PSpice behavioral... edit syntax for other Spices...

****************************************************************** .SUBCKT VCO_BEH VCONT OUT F PARAMS: FMAX=200Meg VMAX=2V FMIN=100Meg VMIN=1V .PARAM PI = 3.141593 G_G1 VC N_1 VALUE { 1+ TANH(80*V(VC, N_1)) } G_G2 N_2 VC VALUE { 1+ TANH(80*V(N_2, VC)) } R_R1 N_3 VC 10K E_BUF1 N_3 0 VCONT 0 1 G_INTEG1 0 $$U_INTEG1 VALUE {V(OMEGA)} C_INTEG1 $$U_INTEG1 0 {1/1.0} R_INTEG1 $$U_INTEG1 0 1G E_INTEG1 OUT 0 VALUE {V($$U_INTEG1)} .IC V($$U_INTEG1) = 0v R_R2 F 0 1K V_V2 N_2 0 {VMIN-100m} V_V1 N_1 0 {VMAX+100m} R_R3 OUT 0 1K R_R4 OMEGA 0 1K E_E1 F 0 VALUE { ((V(VC, 0)-VMAX)*(FMAX-FMIN)/(VMAX-VMIN)+FMAX) } E_E2 OMEGA 0 VALUE { 2*PI*(V(F, 0)) } .ENDS VCO_BEH ******************************************************************

...Jim Thompson

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|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |