Power amplifier arrangement

Abstract

Amplifier of the G class type, comprising at least one set of two transistor pairs (,) having together four transistors (,to,to,) of the same conductivity type with an input electrode, a common electrode and an output electrode, each pair (,) comprising an input transistor (,) and an output transistor (,) in cascade, the output electrode of the input transistor (,) being coupled to the input electrode of the output transistor (,), whereby further means (,) are provided for applying an input signal to the input electrodes of the input transistors (,) of both pairs and both pairs (,) are biased by two different voltage supplies (,), control means being provided for switching over from the voltage of one voltage supply (,) to the voltage of the other voltage supply (,), the transistors (,and,and,) of the first pair (,) of a set being connected in a Darlington circuit arrangement while both transistors (,and,and,) of the second pair (,) have their common electrodes separated from each other, the common electrode of the input transistor (,or,) of the second pair (,or,) being coupled to the output electrode of the input transistor (,) of the first pair (,) and the common electrode of the output transistor (,) of the second pair (,) being coupled to the output electrode of the output transistor (,) of the first pair (,).