The VK1SV class-e calculator

This is an aid for designing class-e amplifiers, as described in Nathan Sokal's paper titled "Class-E RF power amplifiers", published in QEX Jan/Feb 2001. You need to provide Q, Vcc, Vo, P, F and L1 and the calculator will provide values for the rest. See the schematic below for details.

If you use this calculator in one of your designs, please reference this page!

This page is a modified version of the original here to allow input of SI suffixed units and produce them on output as well as calculate L1min, and fr1/fr2.

Enter Q (around 5 is a good start):
Enter Vcc: V
Enter Vo (transistor/FET saturation voltage): V
Enter Coss (transistor/FET output capacitance): F
Enter frequency: Hz
Enter the desired power output: W
Enter L1: H

R is: Ω (Impedance transformer to 50Ω: secondary (50Ω) to primary (amplifier) turns ratio: )
C1 is: F (XC1 is: Ω)
C2 is: F (XC2 is: Ω)
L1min is: Ω (XL1 is: Ω)
L2 is: H (XL2 is: Ω)
XL2 - XC2 = Ω
Expect Icc of at least: I
Select a FET/transistor with a max Vds/Vce of at least: V (Includes a safety factor of 0.8)
1 / fr1 = Hz. When Q1 closed, should be less than the frequency of operation.
1 / fr2 = Hz. When Q1 open, should be greater than the frequency of operation.
1 / (fr1 + f2 half period) = Hz. Should be about equal to the frequency of operation.