Passive Filter Transformations. For every passive filter design, there are two ways of laying out the LC network. In many cases, one of these may be more appropriate for component simulation than the other. Eg. Three pole low-pass filter. p network, best passive layout (fewest inductors).
Eg. Three pole low-pass filter
p network, best passive layout (fewest inductors)
T network, best for component simulation (fewest FDNRs)
Three pole Butterworth low pass filter
Five pole elliptic low pass filter.
Pass band ripple = 1 dB
Stop band attenuation = 60 dB
Inverting Summing Integrator
Applying Kirchoff’s current law at the inverting input node:
Required to convert the inverting integrator into a non-inverting integrator.
The ‘Ring of Three’ or ‘Two Integrator Loop’