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Passive Design
Spiral Inductor Calculator  
This tool calculates inductance for different spiral inductors. The output is an estimate of the inductor value. For accurate results full EM simulation is recommended. The tool equation is referenced from IEEE JSSC 1999 paper "Simple, Accurate Inductance Formulas" by S.S. Mohan et al.

Mutual Inductance between Spiral Inductors  
This tool calculates mutual inductance between two symmetrical spiral inductors. Magnetic coupling between the two inductors can be one of the sources of coupling that lead to increase in spurious tones, crosstalk and even PLL unlocking behavior. The tool equation is referenced from IEEE RFIC symposium 2008 paper "A Simple and Complete Circuit Model for the Coupling between Symmetrical Spiral Inductors in Silicon RF-ICs" by F. Vecchi et.al.

Capacitor Q Calculator  
The tool calculates impedance and quality factor of a capacitor at a certain frequency

Inductor Q Calculator  
The tool calculates impedance and quality factor of an inductor at a certain frequency

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