vivkr
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Hi,
There is a small nonlinear component even in linear caps such as poly-poly or metal-metal, which is important when designing very precise analog circuitry. Typically, the nonlinearity is much less than 100 ppm/V.
Intuitively, I would expect the nonlinearity to be quadratic, i.e. C(V) = C0 + C2(V^2), as I would imagine that the polarity of the applied voltage has no (or very little) influence on the nonlinearity, and only the magnitude matters. However, I often see a linear term here, and
C(V) = C0 + C1(V) + C2(V^2)
The linear term appears to be not insignificant. Why would there be a linear term at all?
Regards, Vivek
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