The Nameless Blog

In a VCO,the capacitance is varied by  using __________.
ans: rev biased varactor diode

A pnp trans. in active region has  _____________.
ans:b-e junction fwd biased & b-c rev biased.

in a nmos how is V-threshold affected by increasing doping conc. of substrate ?
ans:increases

condition for sustained oscillations in a osc is___.
ans:A=1 & phase shift = n*pi.

if  A?B=C and C?A=B then what is the boolean operator ?
ans:xor

clk is given with some period T to a logic gate.
the same clk is again fed to the gate via a delay
element with a delay of T/4 duration.if the gate
acts as a freq.doubler then identify the gate.
ans:xor

define the setup time & hold time in a f/f.

given a D f/f ,construct a T f/f from it.

given a 2:1 mux,how will u implement an AND & OR gate ?