A differential electronic amplifier including: a first switch connected between a first reference voltage and a first node; a second switch connected between a second reference voltage and a second node; a resonant differential load connected between the first and second nodes and having a centre point connected to a third reference voltage; an output stage constituted by a first side of a transformer; a load impedance connected to a second side of the transformer; a first capacitive element connected between the first side of the transformer and the first node; and a second capacitive element connected between the first side of the transformer and the second node; wherein all inductive elements connected in series between the first and second capacitive elements are inductively coupled to the second side of the transformer.
1. A differential electronic amplifier comprising:
a first switch means connected between a first reference voltage and a first node;
a second switch means connected between a second reference voltage and a second node;
a resonant differential load connected between the first and second nodes and having a centre point connected to a third reference voltage;
an output stage constituted by a first side of a transformer;
a load impedance connected to a second side of the transformer;
a first capacitive element connected between the first side of the transformer and the first node; and
a second capacitive element connected between the first side of the transformer and the second node;
wherein all inductive elements connected in series between the first and second capacitive elements are inductively coupled to the second side of the transformer.
2. A differential electronic amplifier as claimed in claim 1 wherein one or more of said inductive elements provide impedance matching combining the outputs of two electronic amplifier circuits comprised in the differential electronic amplifier circuit.
3. A differential electronic amplifier as claimed in claim 1 , implemented on a single integrated circuit.
4. A differential electronic amplifier as claimed in claim 1 , implemented in a radio frequency transmitter circuit.
5. A differential electronic amplifier as claimed in claim 1 , wherein the load impedance is an antenna.
6. A differential electronic amplifier as claimed in claim 1 , wherein the load impedance is 50 Ohms.