Optimized Ultralow-Power Amplifier for OOK Transmitter With Shaped Voltage Drive
Optimized Ultralow-Power Amplifier for OOK Transmitter With Shaped Voltage Drive
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用于具有整形电压驱动的 OOK 发射器的优化超低功耗放大器
DOI：
10.1109/tmtt.2016.2581822
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发表时间：
2016
影响因子：
4.3
通讯作者：
Bumman Kim
中科院分区：
文献类型：
--
作者：
Daechul Jeong;Hankyu Lee;Taeyoung Chung;Seokwon Lee;Jaesup Lee;Bumman Kim
针对一种高效的开关键控（OOK）发射机，设计了一种微瓦级超低功耗（ULP）驱动器和功率放大器（PA）。为了在超低功耗应用中以极高的最佳阻抗实现高效放大，采用了C类拓扑结构，并进行了负载牵引仿真，结果表明所提出的功率放大器在高最佳负载阻抗下无需任何谐波调谐即可实现良好的效率。此外，还对一个电压整形驱动器与功率放大器进行了优化，以实现高效驱动。所提出的驱动器将功率放大器的输入电压整形为具有小导通角的波形。即使在驱动级电源电压较低的情况下，整形后的输入电压也能将功率放大器驱动至饱和工作状态，从而实现良好的效率。所开发的驱动器和功率放大器采用65纳米CMOS工艺实现，支持1 Mb/s的OOK调制信号。当传输连续的1信号时，所实现的功率放大器在-6.8 dBm输出功率下实现了50.8%的漏极效率，在-10 dBm输出功率下实现了49.8%的漏极效率。
For a highly efficient ON-OFF keying (OOK) transmitter, a microwatt-level ultralow-power (ULP) driver and power amplifier (PA) are designed. For efficient amplification with very high optimum impedance in the ULP application, a class-C topology is implemented and loadpull simulations are carried out to show that the proposed PA can achieve good efficiency at high optimum load impedance without any harmonic tuning. In addition, a voltage-shaping driver is optimized together with the PA for an efficient drive. The proposed driver shapes the PA input voltage into a waveform having a small conduction angle. The shaped input voltage drives the PA to a saturated operation for good efficiency even if the supply voltage is low in the drive stage. The developed driver and PA are implemented in a CMOS 65-nm process and support a 1-Mb/s OOK modulated signal. The implemented PA achieves a drain efficiency of 50.8% at the -6.8-dBm output power and 49.8% at the -10-dBm output power when transmitting continuous 1 signal.