Godkända
Digitalt styrd oscillator för mm-vågsfekvenser
Rikard Gannedahl (2013) och Johan Holmstedt (2011)
Start
2017-09-01
Presentation
2018-02-27
Plats:
Avslutat:
2018-06-19
Examensrapport:
Sammanfattning
Frequency synthesizing is one of the most important functions in every radio transceiver and usually achieved using a phase-locked loop (PLL), which traditionally is analog intensive. All-digital PLLs(ADPLL) offer many advantages over its analog counterpart. These include size reduction, better improvements with down-scaling, better time-domain resolution. All-digital PLLs also do not suffer from headroom shortages with lower supply voltages. One main component of the ADPLL is a digitally controlled oscillator (DCO). Recently, several papers on DCOs at mm-wave frequencies have been published. The main challenges associated with DCO at mm wave frequencies is often considered to be the frequency resolution. Since the smallest capacitors available often correspond to large frequency steps which leads to quantization. This is later converted to phase noise. Further, the Q value is often limited by the tank, leading to increased power dissipation and phase noise. The thesis aims to investigate whether its possible to implement a DCO at 86 GHz with 20 percent frequency tuning range and a maximum frequency resolution of 1 MHz with low phase noise and power consumption.
Handledare: Torbjörn Sandström (Ericsson) och Anna-Karin Stenman (Ericsson) och Henrik Sjöland (EIT)
Examinator: Pietro Andreani (EIT)