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We present an injection-locked Class-E power amplifier (Class-E ILPA) suitable for 2.4-GHz wireless sensor network applications where the maximum transmit-power is typically about 10dBm. In such a low transmit-power application, it is a great challenge to achieve a high transmit efficiency because the driving power and dc power consumption in the previous stage are no more negligible compared with the transmitted signal power. The proposed Class-E ILPA, which is fully integrated in 0.18-μm CMOS technology, achieves the power added efficiency of 44.5% while delivering the output power of 11dBm with drain efficiency of 49.3% at 1.2-V supply voltage. The measured locking range reaches 300MHz with the input driving power of -6dBm.