1 Introduction
This application note provides an overview of an Ultra-Wideband (UWB) wireless transceiver communication
system and link budget. The document reviews UWB transceiver performance, focusing on the receiver
cascaded system noise figure and overall system sensitivity improvements, both with and without an external
discrete Low Noise Amplifier (LNA) and Band-Pass Filter (BPF).
Table of Contents
1 Introduction ................................................................................................................................................. 1
1.1 Overview.............................................................................................................................................. 2
1.2 Hardware and Software Modifications ................................................................................................ 2
2 Hardware Description ................................................................................................................................. 3
2.1 Overview.............................................................................................................................................. 3
2.2 Designing an LNA Scheme ................................................................................................................. 4
2.2.1 Calculating the Noise Figure .......................................................................................................... 5
2.2.2 Example of Noise Figure Calculation ............................................................................................. 5
2.2.3 Dynamic Range Calculation ........................................................................................................... 6
2.2.4 Example Calculation of Highest Supportable Signal Power .......................................................... 7
2.3 Control Signals .................................................................................................................................... 7
2.4 Power Supplies ................................................................................................................................... 7
2.5 Detailed Schematic ............................................................................................................................. 8
2.6 RF Paths and PCB Layout .................................................................................................................. 8
2.7 List of Suitable Components ............................................................................................................... 8
3 Software Implementation ............................................................................................................................ 9
3.1 Introduction .......................................................................................................................................... 9
3.2 Register Programming ........................................................................................................................ 9
3.3 Source Code Changes ...................................................................................................................... 10
4 Other Considerations ................................................................................................................................ 11
4.1 Effect on Antenna Delay and Antenna Calibration ............................................................................ 11
4.2 Effect on Transmitter Maximum Power ............................................................................................. 11
4.3 Potential Receiver Saturation ............................................................................................................ 11
4.4 RF Blocking Performance ................................................................................................................. 11
References ....................................................................................................................................................... 12
Abbreviations .................................................................................................................................................... 12
Important Notices .............................................................................................................................................. 12
Document History ............................................................................................................................................. 12
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