Using Glaplace component in PSPICE for frequency controlled resistor

What are you trying to achieve?

Typically, the point of a frequency dependant resistance is to simulate skin effect resistance for inductors. This can be achieved by an LR ladder network.

If this is your goal, a better option is to use a model that gives the correct 45 degs, 10db/dec characteristic. Pure frequency dependant resistors produce responses that are non real.

e.g.

.SUBCKT SkinEffectResistance_XN !0_A !1_B FMAX=110M K=0.49

• _SS_Symbol [<System>Functional.ssm] [SkinEffectResister]

• V!1 !1_B B 0 V!0 !0_A A 0
• skin effect impedance variation with sqrt(F)
• set F0 to > max fequency of operation .param FX={FMAX/100} .param L={0.1*K/sqrt(FX)} .param R={10*K*sqrt(FX)}
• R8 Node8 A {R/128} L8 Node8 B {L*128} L1 Node1 B {L} R1 Node1 A {R} R6 Node6 A {R/32} R5 Node5 A {R/16} R4 Node4 A {R/8} R3 Node3 A {R/4} R2 Node2 A {R/2} R0 B A {R} R7 Node7 A {R/64} L2 Node2 B {L*2} L3 Node3 B {L*4} L4 Node4 B {L*8} L5 Node5 B {L*16} L6 Node6 B {L*32} L7 Node7 B {L*64}
• .ENDS

There is an example in my freebee SuperSpice

That demonstrates this.

Furthermore, there are sets of CoilCraft inductor models that fully implement their inductors using that technique. The Model files should also run directly in LTSpice.

-- Kevin Aylward