Improved Efficiency 2.4 GHz Class-E Power Amplifier with Improved Controlled Output Power

Background/Objective: High efficiency power amplifiers must provide the required power for signal transmission. Class-E PA is a nonlinear switching type PA which can ideally achieve 100% efficiency. High efficiency and low level output power design of power amplifier is a requirement for optimization of the energy efficiency of the transmitter. Methods/ Statistical Analysis: Modified class-E structure with low output power is presented in this paper which is able to deliver low output power with high efficiency. This structure uses a π matching network. Findings: Some advantages of proposed power amplifier are the possibility of on-chip implementation, proper power efficiency, improved controlled output power and application in short-range wireless sensor networks. In the proposed power amplifier, controlled output power line is connected with bias voltage input transistor that efficiency of power amplifier is improved in the overall range. In this paper, a 2.4 GHz class-E power amplifier structure with high efficiency has been designed. Maximum output power of the proposed amplifier is 46 mW with maximum added power efficiency of 49%. Application/Improvement: The proposed power amplifier is appropriated in short range wireless sensor networks. It has the capability to control output power from 1.75 to 46 mW with 4 to 49% efficiency. The structure has been designed and simulated using 0.18 um CMOS technology.