Thoru Yokoyama

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A low current dissipation MMIC power amplifier operating with a 3.5 V single voltage supply has been developed for PHS. This MMIC utilizes a pseudomorphic double heterojunction modulation doped FET (P-MODFET) to realize single voltage operation and low operating current simultaneously. It exhibits very low operating current of 141 mA at the output power of(More)
A normally-off MODFET power MMIC has been developed for 1.9 GHz Japanese Personal Handy-phone System (PHS). High power added efficiency (PAE) of 41.7% at the output power (P/sub out/) of 22.0 dBm has been achieved under 3.0 V single-supply condition. The operating current is only 127 mA and the adjacent channel leakage power (P/sub adj/) is -58.2 dBc. Three(More)
A power MMIC operating with a single-supply (3.0 V) has been developed for 5.8 GHz Japanese electronic toll collection system (ETC). The present MMIC was provided with two FETs, matching circuits (input, intermediate and output matching circuits), and two drain bias circuits. High dielectric constant material SrTiO/sub 3/ (STO) is used for by-pass and(More)
A high efficiency 3-stage power MMIC operating with a single 3.0 V supply has been developed for 1.9 GHz PACS (low tier PCS) handsets. The pseudomorphic double heterojunction modulation doped FET (MODFET) has enabled a single 3.0 V operation. The MMIC includes all matching circuits (input, output and internal matching circuits), but drain and gate bias(More)
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