An improved method of power control with CMOS class-E power amplifiers

—In this paper, an improved method of power control is introduced to widen the range of output power with high efficiency. Two CMOS class-E power amplifiers (PA) with different output power are adopted in the design. In order to eliminate the phase mismatch of two paths, a continuously adjustable CMOS phase shifter with a predictable phase transfer function is added before each PA. Meanwhile, the drain modulation technique is presented to vary the voltage supply of the amplification unit. With the combination of drain modulation and parallel amplification, a wider range of output power is obtained than the previous one. The amplifiers work

• Type: Conference
• Year: 2008
• Where: ISCAS
• Authors: Tongqiang Gao, Chun Zhang, Baoyong Chi, Zhihua Wang
• Keywords: CMOS Class-E Power, Drain Modulation, Hardware, ISCAS 2008, Output Power