# RF Amplifier Calculator

Enter value and click on calculate. Result will be displayed.

Delta = S11 ⋅ S22 - S12 ⋅ S21
Rollet Stability Factor =[1 - |S11|2 - S22|2 + |Delta|2] / 2 × |S21| × |S12|

Impedance Zo:
ohms
Frequency:
MHz
Source Impedance:
j
j
Source L Match Networks:

S Parameters:

S11:
S12:
S21:
S22:

Result:

Rollet Stability Factor:
Maximum Allowable Gain:
Gain
Maximum Allowable Gain:
Db
Conjugate Input Reflection:
Polar
Conjugate Output Reflection:
Polar
Input Impedances:
j
Output Impedances:
j

Source L Match Network Components:

Capacitance:
pf
Inductance:
nH
Qs:

Capacitance:
pf
Inductance:
nH
QL:
RF Amplifier Calculator

An RF amplifier is an electronic amplifier used to convert a low-power radio frequency signal into a larger signal, typically used to drive a transmitter antenna.

Rowlett's stability coefficient (K) is known from John Rowlett's 1962 IRE paper on stability and linearity of twoports of amplifiers with constant power gain.

Really the stability factor is a one way to get an indication of whether you're going to have a problem or not. If K>1, then the device will be unconditionally stable for any combination of source impedance and load impedance. Devices with K<1 are potentially unstable and may fail with certain combinations of source and load impedances.

The maximum allowable gain (MAG) of a device is when the roller stability factor is greater than 1. The maximum gain allowed is the highest gain expected to be achieved from a conjugate matched amplifier.

A network is a network of two branches connected in series, with the free end connected to a pair of terminals; the terminal point and one free end connected to the other terminal. The disadvantage with l-networks is that they have a fixed Q, which is a function of the ratio of the two impedances to the matching resistor parts. Q is important because it determines network bandwidth.

The purpose of the matching network is to combine the required load and source impedances into the calculated load and source impedances they produce.

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