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!

Enter Q (around 5 is a good start):
Enter Vcc in volts:
Enter Vo (transistor/FET saturation voltage) in volts:
Enter frequency in kHz:
Enter power in watts:
Enter L1 in mH:

R in ohm is: (Impedance transformer to 50 ohm: secondary (50 ohm) to primary (amplifier) turns ratio: )
C1 in nF is:
C2 in nF is:
L2 in uH is:
Expect Icc in amps at least:
Select a FET/transistor with a max Vds/Vce in volts at least: (Includes a safety factor of 0.8)


Schematic from Nathan Sokal's paper titled "Class-E RF power amplifiers", published in QEX Jan/Feb 2001.

For more info on designing Class-E amplifiers for LF/MF, see VK1SV's Class-E for beginners

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