【摘要】 提出了一种应用于无线内窥镜系统的2.4GHz低功耗ASK发射机.为了获得高的数据传输速率,采用了基于混频器的直接上变换发射机结构.为了节省功耗,提出了一种基于电流复用技术的伪差分堆栈结构的A类功放.低功耗发射机由两部分组成:基于恒幅度锁相环(PLL)的20MHz的ASK基带调制器和直接上变换的射频电路.该设计已经采用TSMC0.25μmCMOS工艺实现并进行了验证.测试结果表明,发射数据速率为1Mbps时,发射机的输出功率为-23.217dBm.采用单2.5V的电源供电下,低功耗发射机消耗的电流约为3.17mA.更多还原

【Abstract】 A 2.4GHz ASK transmitter suitable for a low power wireless capsule endoscope system is presented.A mixer-based frequency up-conversion transmitter architecture is employed to achieve a high data rate.A pseudo-differential stacked class-A power amplifier using the current reuse technique is proposed to save power.The transmitter mainly includes two parts:a 20MHz ASK modulator based on a constant amplitude phase lock loop (PLL) and a direct up-conversion RF circuit.This design,implemented in a TSMC 0.25μm CMOS process,achieves a -23.217dBm output power with a data rate of 1Mbps and dissipates 3.17mA of current with a single 2.5V power supply.更多还原