I will try to answer on
some of your questions:
1. What value of inductance I should use with
power choke inductor, refer to application circuit?
The inductor value should give you a reactance
of several hundreds ohms (at least 300 ohms) in
your lowest frequency of operation. remember that
as the frequency increases, XL increases as well.
In addition, you should choose the inductor
such that its SRF (Self-Resonance Frequency) would
be at least twice higher than your maximal frequency
of operation in order to avoid a capacitive reactance.
How I define output M.N.? refer to application
Usually for LNA, you define the output matching
network as one for conjugate match. This is because
the input matching for noise figure degrades the
return loss at the input and reduces the overall
gain (mismatch), and as a result you loose power.
If I do a simple output conjugate matching,
should I turn on LNA, if yes, is power choke
a part of matching network?
You should design the output matching only
after your input mtaching network is fully designed
and connected to the LNA, because the input matching
network will affect your S22. The reason for that
is that the amplifier is not unilaterlal, i.e. there
is a certain feedback from the output to the input
The choke (power inductor as you named
it) if properly chosen, should slightly influcnece
on the output mathcing network. Actually, it isolates
between the supply voltage to the matching network.
Usually from RF signal point of view, it only slightly
increases the gain.
So your output matching
newtok should be designed to the conjugate of the
modified S22 (With the influence of the input matching
You should turn on the LNA, in
order to measure the output power.
In general, when designing matching networks,
pay attention to the stability of the amplifier.
It is very important to check that your required
reflection coefficients are located within the stable
You can perform stability simulation
or calculate K (Rollet's Factor). For unconditional