$11.$ Two power distribution networks are given below.

a$)$ Roughly draw the output waveforms at nodes $\backslash ($ V$\_\{$A$\}/$ V$\_\{$B$\},$ V$\_\{$i$\},$ V$\_\{0\}\backslash )$ in each circuit.

b$)$ Which circuit has better power efficiency, top or bottom?

c$)$ Which circuit still has residual AC noise at the final output node?

d$)$ Which circuit should be used to power the front$-$end of a biomedical device?

e$)$ Which circuit is likely be used for the DSP circuit in a biomedical device?