1. A phase shift keying signal transmission circuit comprising a phase shift keying modulator and a class E power amplifier,
the class E power amplifier comprising an active device, a first inductor, a DC blocking element and an oscillating element
driven by a voltage signal and comprising a parallel LC resonant circuit connected in parallel with the active device, wherein
the first inductor is connected in series between the active device and the DC blocking element,
wherein the phase shift keying signal transmission circuit incorporates an analogue signal source connectable to a class E
power amplifier bias voltage control means so that the analogue signal source modulates the output from the phase shift keying
modulator.
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