英语翻译
1、The heterodyne receiver architecture was ruled out due to the need of off-chip image rejection filters which opposes the goal of a low-cost application where direct antenna coupling is preferred.
2、A traditional RF front-end consists of an LNA followd by I and Q mixers driven by I and Q LO signals ,respectively.（LO本季振荡器）
3、A microphotograph of the 5.77mm² die is shown in Fig.14.(图表14)（die如何理解?）
（来自《A Fully Integrated 2.4-GHz IEEE 802.15.4-Compliant Transceiver for ZigBee™ Application）