Linear Systems Releases First SPICE Model for the VCR11N Voltage-Controlled Resistor

Linear Systems is pleased to announce the release of the first SPICE model for the VCR11N, developed by our engineer Allan Cabiluna.

This new model allows designers to simulate the VCR11N voltage-controlled resistor in LTspice and other SPICE-compatible simulators, enabling faster circuit development and performance evaluation.

The VCR11N is an N-channel JFET designed for use as a voltage-controlled resistor, allowing the drain-source resistance to be adjusted using gate voltage. This makes it ideal for applications requiring precise signal attenuation and gain control.

Typical applications include:

• Amplifier gain control

• Oscillator amplitude stabilization

• Programmable attenuators

• Analog signal processing

• Filter tuning

The device is designed for low-level AC signals with no DC component, providing predictable RDS variation with VGS control and allowing it to operate as a symmetrical resistor with no DC bias in the signal loop.

The VCR11N is also a pin-for-pin replacement for the Siliconix VCR11N, supporting both legacy designs and new circuit development.

Providing SPICE models helps engineers evaluate performance early in the design cycle and integrate Linear Systems devices with greater confidence.

We plan to expand our SPICE model library to support additional Linear Systems devices in the future.

spice

.MODEL VCR11N_UPDATED NJF(

+ VTO=-9.29  BETA=3.36E-4  VTOTC=-2.2m       

+ BETATCE=-0.5 LAMBDA=1E-4  RD=46.2  RS=46.2           

+ IS=1E-14 ISR=1E-13 N=1.0 NR=2.0  XTI=3.0 BVK=80.0  IBV=10U           

+ ALPHA=1E-3 VK=0.7 CGS=7.5P CGD=7.5P          

+ PB=1.0 M=0.5 MJ=0.5 FC=0.5            

+ KF=1E-17 AF=1 GDSNOI=1.0 NLEV=2            

+ TNOM=27           

+ MFG=Linear_Systems

Learn more about the VCR11N and access the datasheet and product details here:

https://www.linearsystems.com/voltagecontrolledresistors/vcr11n