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elektroda.net NewsGroups Forum Index - EDA CAD Electronics - **Frequency Dependent Resistance**

Guest

Fri Apr 02, 2004 5:19 am

I'm looking for a way to model a frequency dependent resistor in PSPICE

(ORCad). I have some empirical data for a load which changes resistance

(real part of impedance) with frequency. The changes are non-linear and are

not monotonic. Prefer to use a lookup table if that is a possibility.

Thanks for any help you can provide.

Jason

Guest

Fri Apr 02, 2004 4:50 pm

Jason Dugas wrote:

I'm looking for a way to model a frequency dependent resistor in PSPICE

(ORCad). I have some empirical data for a load which changes resistance

(real part of impedance) with frequency. The changes are non-linear and are

not monotonic. Prefer to use a lookup table if that is a possibility.

Thanks for any help you can provide.

Jason

Hi Jason,

(ORCad). I have some empirical data for a load which changes resistance

(real part of impedance) with frequency. The changes are non-linear and are

not monotonic. Prefer to use a lookup table if that is a possibility.

Thanks for any help you can provide.

Jason

Hi Jason,

Take a look at the Gfreq device. If you think of a resistor as a

voltage controlled current source (i.e. current depends on voltage,

right!) then wire one of these with the two 'top' pins (in+ and out+)

together, and the two 'bottom' pins (in- and out-) together, and you

have a device that senses the voltage across itself. You then enter

your table of values in it, and it should work!

--

Charlie

--

Edmondson Engineering

Unique Solutions to Unusual Problems

Guest

Sat Apr 03, 2004 3:31 am

On Thu, 1 Apr 2004 23:19:33 -0600, "Jason Dugas" <kb5urq_at_hotmail.com>

wrote:

I'm looking for a way to model a frequency dependent resistor in PSPICE

(ORCad). I have some empirical data for a load which changes resistance

(real part of impedance) with frequency. The changes are non-linear and are

not monotonic. Prefer to use a lookup table if that is a possibility.

Thanks for any help you can provide.

Jason

(ORCad). I have some empirical data for a load which changes resistance

(real part of impedance) with frequency. The changes are non-linear and are

not monotonic. Prefer to use a lookup table if that is a possibility.

Thanks for any help you can provide.

Jason

The following work in PSpice and LTSpice. The data is entered as

complex admittance. You don't need to use a subcircuit as shown in the

example. There is also a method of using a voltage controlled voltage

source and a current meter (V source) if you want to enter the data as

complex impedance. See

http://www.ecircuitcenter.com/Circuits/vc_resistor1/vc_resistor1.htm

*Data format: Freq(Hz) G(mhos) B(mhos)

..SUBCKT XDCRZ 1 2

G1 2 1 FREQ {V(2,1)}= R_I (

+ 130000.000000 1.2703m 11.012m

+ 131567.000000 1.2536m 11.201m

+ 133152.890625 1.3147m 11.431m

+ 134757.890625 1.3671m 11.603m

+ 136382.234375 1.3512m 11.874m

+ )

..ENDS XDCRZ

Regards, Mark

Guest

Tue Aug 07, 2012 12:18 pm

On Saturday, April 3, 2004 9:01:59 AM UTC+5:30, qrk wrote:

On Thu, 1 Apr 2004 23:19:33 -0600, "Jason Dugas" <kb5urq_at_hotmail.com

wrote:

I'm looking for a way to model a frequency dependent resistor in PSPICE

(ORCad). I have some empirical data for a load which changes resistance

(real part of impedance) with frequency. The changes are non-linear and are

not monotonic. Prefer to use a lookup table if that is a possibility.

Thanks for any help you can provide.

Jason

The following work in PSpice and LTSpice. The data is entered as

complex admittance. You don't need to use a subcircuit as shown in the

example. There is also a method of using a voltage controlled voltage

source and a current meter (V source) if you want to enter the data as

complex impedance. See

http://www.ecircuitcenter.com/Circuits/vc_resistor1/vc_resistor1.htm

*Data format: Freq(Hz) G(mhos) B(mhos)

.SUBCKT XDCRZ 1 2

G1 2 1 FREQ {V(2,1)}= R_I (

+ 130000.000000 1.2703m 11.012m

+ 131567.000000 1.2536m 11.201m

+ 133152.890625 1.3147m 11.431m

+ 134757.890625 1.3671m 11.603m

+ 136382.234375 1.3512m 11.874m

+ )

.ENDS XDCRZ

Regards, Mark

wrote:

I'm looking for a way to model a frequency dependent resistor in PSPICE

(ORCad). I have some empirical data for a load which changes resistance

(real part of impedance) with frequency. The changes are non-linear and are

not monotonic. Prefer to use a lookup table if that is a possibility.

Thanks for any help you can provide.

Jason

The following work in PSpice and LTSpice. The data is entered as

complex admittance. You don't need to use a subcircuit as shown in the

example. There is also a method of using a voltage controlled voltage

source and a current meter (V source) if you want to enter the data as

complex impedance. See

http://www.ecircuitcenter.com/Circuits/vc_resistor1/vc_resistor1.htm

*Data format: Freq(Hz) G(mhos) B(mhos)

.SUBCKT XDCRZ 1 2

G1 2 1 FREQ {V(2,1)}= R_I (

+ 130000.000000 1.2703m 11.012m

+ 131567.000000 1.2536m 11.201m

+ 133152.890625 1.3147m 11.431m

+ 134757.890625 1.3671m 11.603m

+ 136382.234375 1.3512m 11.874m

+ )

.ENDS XDCRZ

Regards, Mark

Can I give an equation ?

I am trying to use ABM2/I and I am able to use TIME in the equation however I am not able to use freq(or Frequency) in the equation.

Can anyone please help?

elektroda.net NewsGroups Forum Index - EDA CAD Electronics - **Frequency Dependent Resistance**