USING HOMOGENEITY
Assume that the answer is known. Can we
Compute the input in a very easy way ?!!
If Vo is given then V1 can be computed
using an inverse voltage divider.
… And Vs using a second voltage divider
Solve now for the variable Vo
The procedure can be made entirely algorithmic
1. Give to Vo any arbitrary value (e.g., V’o =1 )
2. Compute the resulting source value and call it V’_s
3.
Use linearity.
4. The given value of the source (V_s)
corresponds to
Hence the desired output value is
This is a nice little tool
for special problems.
Normally when there is
only one source and
when in our judgement
solving the problem
backwards is actually
easier
