weekly facts

1. Parametric sensing is possible by detecting the change at the output from the nominal output. Thus, most importantly, the information lies in how much deviate from the nominal vlaue. This deviation, or change, comes from the parameter component (sensitive to a particular meausre) value change from its nominal value. This deviation eventually changes the output value so that we can sense input measure!

2. delta function
The unit of delta function is delta($) = [1/$]. This is becuase a delta function is a general function and it is defined only under the integration, which is 1. Since we integrate in term of d$ [$] and the integration result is 1, the delta function itself should have a unit of [1/$]

3. Differental mode noise analysis
In noise analysis, if noise sources are uncorrelated and additive, the half-circuit concept used in signal analysis cannot be used in noise analysis. This is because due to lack of correlation, the middle cut in the origianl circuit will not provide the half-circuit with a good virtual ground. The best way, not necessarily the easist way, is to derive the noise effect of each source individually!!