Skyworks White Paper: Ultra Low Noise Amplifiers By Stephen Moreschi and Jody Skeen

Introduction

This white paper describes the performance and characteristics of two new ultra low noise LNAs from Skyworks. Topics include techniques used in biasing and matching these devices. A circuit description, including information on thermal considerations, is also provided.

The SKY67150-396LF and SKY67153-396LF were designed to cover a wide bandwidth with the use of two separate devices with their design and performance analyzed from 30 MHz – 4.0 GHz. Package pin-outs for each device are identical, with the only differences in the applications schematic and frequency band of interest for each device. The remainder of the paper will primarily focus on the SKY67150-396LF but will also be applicable, unless otherwise noted, for the SKY67153-396LF.

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CML – Bringing the Flexibility of Software Defined Radio to Narrowband and Industrial Wireless Applications

Introduction

A Software-Defined Radio (SDR) is one that implements some traditional hardware radio functions in software. For example, in the extreme case one can use a high performance Analog-to-Digital Converter (ADC) to digitize a wide swath of RF spectrum, then implement functions in software to provide the down-conversion mixer, filtering, and baseband recovery. Such a radio implementation is very powerful, as it can make “on the fly” adjustments to recover different types of radio signals across a wide range of frequencies. However, this ultimate flexibility comes at the cost of high power consumption, the expense of cutting-edge performance ADC and Digital Signal Processor (DSP) devices and the significant challenge of developing underlying software algorithms.

   
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