High-Frequency Analog Signal Processing IC for GSM/EGSM Digital Cellular Standard

INTRODUCTION PORTABLE phones have been such a hit in the market because their small, lightweight design enables them to be taken along wherever the user goes. The inconvenience of recharging also means that long call and standby times are highly valued. To provide a solution to these market needs, Hitachi engineers focused on the high-frequency signal processing block, which uses more external peripheral components than the baseband block and requires a comparatively large mounting area. With the goal of reducing the size, cost, and power consumption of this high-frequency signal processing block, Hitachi collaborated with British GSM system consultants TTP Communications Ltd. to develop a commercial GSM high-frequency analog signal processing IC, the HD155101F, that integrates the transmission and High-Frequency Analog Signal Processing IC for GSM/EGSM Digital Cellular Standard — Reductions in System Size and Cost Achieved Through Use of Offset PLL Mode in Transmitter —