Circuit for converting a differential signal into a non-differential signal, and RF transmitter comprising such a circuit

摘要

A circuit for converting a differential signal into a nondifferential signal comprising first and second inputs respectively receiving first and second components of a differential signal. The circuit comprises a single bipolar transistor having an emitter, a base and a collector. The transistor is biased so as to allow flowing of an emitter d.-c. bias current sufficient to allow a linear conversion of a differential RF signal, for example. Both components of the differential RF signal are respectively injected into the emitter and the base of the bipolar transistor so that a remarkably linear conversion is carried out by means of a very simple circuit. The circuit is particularly adapted to the realization of an integrated RF transmission chain.