1. Software Defined Radios 長庚電機通訊組 碩一 張晉銓 指導教授 : 黃文傑博士

2. Outline The purpose of the RF front-end Dynamic Range RF Receiver Front-End Topologies Enhance flexibility of the RF chain with software radios

3. The purpose of the RF front-end Isolated the desired signal from interference and noise With minimal distortion, convert the desired signal’s center frequency to a range compatible with the ADC( non-linear distortion and noise) A dynamic range that is compatible with that of the ADC

4. Dynamic Range: The principal Challenge of Receiver Design

5. RF Receiver Front-End Topologies-type1 The most common types of RF front-ends are dual conversion,single conversion,and turned radio frequency receivers Sensitivity Selectivity Stability Dynamic range Spurious response

6. RF Receiver Front-End Topologies-type2

7. RF Receiver Front-End Topologies-type3

8. RF Receiver Front-End Topologies Impact on constellation due to imperfect mixing process.

9. Image Frequency problem of Heterodyne Receiver

10. Enhance flexibility of the RF chain with software radios

12. End Thank you for your attention