Low-power RF low-noise amplifier and power amplifier design.

摘要

Low Power RF design is important for portable wireless communication systems. Low noise amplifiers and power amplifiers are two important components in such systems. The low noise amplifier is at the input to the receiver and sets the overall system sensitivity, and the power amplifier is at the end of the transmitter chain and provides the power to communicate between base station and mobile station.; An optimization for two-stage low noise amplifier is presented. This approach allows getting minimal power dissipation under a power and linearity constraint.; A technique is presented to improve the efficiency of linear Class "A" power amplifiers by using dynamical current biasing with gain compensation. This technique is applied to a 2.4 GHz power amplifier. Simulations show that the dynamical current biasing results in a significant improvement in efficiency and that the gain compensation maintains the linearity as compared to a conventional implementation. With two tone input, the efficiency improvement is larger than 50% for amplifier driven 6-dB below saturation.