The Linear Subcircuit

The noise stemming from the linear subcircuit is calculated in two steps:

1. An AC noise analysis (see section 5.2) is performed for the interconnecting nodes of linear and non-linear subcircuit. This results in the noise-voltage correlation matrix $(\boldsymbol{\underline{C}}_{Z,lin})_{N\times N}$.
2. The matrix $(\boldsymbol{\underline{C}}_{Z,lin})_{N\times N}$ is converted into a noise-current correlation matrix (see section 2.4.2):

   $$(\boldsymbol{\underline{C}}_{Y,lin})_{N\times N} = \boldsymbol{\hat{Y}} \cdot \boldsymbol{\underline{C}}_{Z,lin} \cdot \boldsymbol{\hat{Y}}^+$$ (8.1)

   
   
   where $\boldsymbol{\hat{Y}}$ is taken from equation 7.2.

Remark: If no explicit noise sources exist in the linear subcircuit, $(\boldsymbol{\underline{C}}_{Z,lin})_{N\times N}$ can be computed much faster by using Bosma's theorem (equation 2.38).