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Nonlinear Inductor: NLINDA



NLINDA is a replacement for NLIN. It also provides all the functionality found in Spectre's inductor.


Name Description Unit Type Default
ID Element ID Text L1
*L Inductance Inductance 0
*R Resistance Resistance 0
*MULT Multiplicity factor   1
*TC1 Linear temperature coefficient of resistance   0
*TC2 Quadratic temperature coefficient of resistance   0
TNOM Parameter extraction temperature Temperature 26.85DegC
TEMP Device temperature Temperature _TEMP
*COEFFS Vector of polynomial coefficients    
*NFLAG Noise flag   On
*KF Flicker (1/f) noise coefficient   0
*AF Flicker (1/f) noise exponential term   2

Operating Points

The letter pair pn identifies the only NL branch of this model. Consequently, Vpn and Ipn identify voltage and current of this branch, respectively.

Parameter Description
ind (Inductance) Element inductance

Implementation Details

Several differences are noticed when NLINDA is compared with its predecessor NLIND: polynomial coefficients are entered as a vector, COEFF = {L0,L1,L2,...}, instead of as individual parameters; NLINDA accounts for noise, both thermal and Flicker; parameter R is used to model the inductor's series resistance, and is temperature dependent:

R = R * ( 1 + TC1*(TEMP-TNOM)^2 + TC2*(TEMP-TNOM)^2 ).

In the following equations, I is the current into pin 1 (marked on the symbol), as measured in Amperes.

The inductance is given by

The corresponding flux is given by


This element does not have an assigned layout cell. You can assign artwork cells to any element. See “Assigning Artwork Cells to Layout of Schematic Elements” for details.

Recommendations for Use

NOTE: NLINDA is implemented as a nonlinear device in harmonic balance simulations, independently of whether the polynomial truly describes a nonlinear device. As a result, from a performance standpoint, it is advisable to limit the use of this element to those cases where the desired functionality cannot be implemented by a simpler linear element.

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