Haruhiko Koizumi

A GaAs single balanced mixer MMIC with built-in active balun for personal communication systems

A GaAs single balanced mixer IC with built-in active baluns for IF and LO inputs has been developed. The present mixer achieved the conversion gain of 16 dB and the LO signal suppression over 30 dBc at the LO input power of 0 dBm. Owing to a novel BST (Barium Strontium Titanate) capacitor technology, the implemented mixer IC was packaged in the small 6 pin outline with the extremely small chip size of 0.6/spl times/0.65 mm/sup 2/. The IC can eliminate the LO filter of the up-conversion system for a variety of handyphone-sets in L-band.<<ETX>>

A low power GaAs front-end IC with current-reuse configuration using 0.15 /spl mu/m gate MODFETs

We have developed a novel current-reuse configuration of front-end IC, where the current can be reused in the whole circuit blocks such as low noise amplifier, local amplifier and mixer. The power dissipation is reduced by the factor of three. Excellent high frequency performance such as conversion gain of 30 dB and NF of 1.6 dB at 1.5 GHz is attained under the conditions of supply voltage and current of 3.6 V and 3 mA, respectively.