Ultra-Low Noise Figure, High-Gain Amplifier With High Linearity

By Skyworks Solutions, Inc.

Introduction

Infrastructure receiver applications for cellular/3G, ISM, GPS, WiMAX/4G, automotive applications, and satellite radio require low-noise amplifiers (LNAs) with very low noise figures (NF), good input and output return loss, high linearity, low current, wide band stability, and robust performance. These conflicting design requirements are equally important, so they have to be achieved simultaneously. These challenging requirements demand highest available performance from the technology. To obtain an optimized performance with minimum trade-offs, unique design techniques and superior pHEMT process technology are used.

This white paper describes different trade-offs, design options, and implementation of a sub 1 dB low NF (~ 0.6 dB), high gain (> 20 dB), and very high linearity (> +34 dBm) two-stage LNA.

The SKY65040-360LF LNA maintains a very low NF up to 2.5 GHz and an excellent 3rd Order Output Intercept Point (OIP3). The design is fabricated using Skyworks proprietary low-noise, high linearity depletion-mode pHEMT process. It is an ideal building block for base stations and satellite radios where NF and linearity (IIP3) are very critical. Typical applications include GSM, PCS, WCDMA, TD-SCDMA base stations, GPS and satellite radios.

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•White Paper: Ultra-Low Noise Figure, High-Gain Amplifier With High Linearity