Since the introduction of the personal handy-phone system (PHS), there have been reductions in the size, weight and power consumption of its terminals.This paper describes research and development efforts at the Research and Development Center toward an integrated transmitter RF-IC for PHS terminals. We have fabricated two silicon test chips, namely, a 1.9 GHz quadrature modulator IC and a 1.9 GHzvariable attenuator IC, which require no adjustment or trimming, with the aim of realizing a cost-effective solution. To achieve further miniaturization, we have also developed a gallium-arsenic (GaAs)-based power amplifier module which has a volume ofonly 0.039 cc.
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