| Out in Front |
As system supply voltages fall to 3V, it’s difficult for analog devices to provide both efficiency and low distortion, especially in RF applications. A power amplifier and two driver amplifiers from Oki Semiconductor, for operation from 850 MHz to 2.4 GHz, use GaAs process enhancements to provide low distortion at high gain in personal-communications-system applications.
The KGF1658 power amplifier in a ceramic surface-mount package provides 31-dBm output at 850 MHz with a 3.4V supply. Efficiency is greater than 55%, adjacent-channel leakage power is –28 dBc, and peak current capability is at least 5.5A. The KGF1631 power FET driver in a SOT89 plastic package provides output power greater than 24 dBm, with 50% efficiency and 21-dB typical gain. The higher power KGF1633 driver features 27-dBm power and 19-dB gain specifications. The KGF1658, KGF1631, and KGF1633 cost $14.50, $6, and $8.36 (1000).—by Bill Schweber
Oki Semiconductor Corp, Sunnyvale, CA. (408) 720-1900, http:// www.okisemi.com.
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