Low power dissipation single-supply MMIC power amplifier for 5.8 GHz electronic toll collection system

A MMIC power amplifier operating with a single-supply; (3.0 V) has been dev eloped for 5.8 GHz Japanese Electronic Toll Collection (ETC) System. The pr esent MMIC contains two FETs, matching circuits (input, intermediate and ou tput matching circuits), and two drain bias circuits. High dielectric const ant material SrTiO3 (STO) is used for by-pass and input coupling capacitors . Very small die size of 0.77 mm(2) has been realized by using the STO capa citors and negative feedback circuit technology. High 1 dB output gain comp ression point (P-1dB) of 13 dBm, high gain of 21.4 dB and low dissipation c urrent of 41.3 mA have been achieved under 3.0 V single-supply condition.