Abstract
The use of GaAs monolithic microwave integrated circuits (MMICs) for the power amplifier in portable telephones is a quantum leap in terms of technology and it affords major benefits in return especially for handheld applications. Mitsubishi has led the way in the use of MMICs and of the four current suppliers of handheld analogue telephones to the NTT telecom body in Japan, Mitsubishi is the only company using GaAs MMICs for the power amplifier in its telephones, of which it is currently producing 20 000 to 30 000 per month.
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