Title :
Wide-tuning-range dual-VCOs for cable modem receivers
Author :
Stadius, K. ; Halonen, K.
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
A double-conversion receiver for cable modem applications requires a wide-tuning-range VCO with low phase noise characteristics for the first LO generation. Achieving simultaneously low phase noise and large tuning range from a monolithic VCO Is an exceptionally challenging task. The design aspects of wideband monolithic LC-VCO are tackled In this paper with the boundaries set by a 0.9-/spl mu/m SiGe HBT technology. Two dual-VCO implementations are presented and a method for buffering the VCO signal without loading the LC-resonator is proposed. Both simulation and experimental results are given.
Keywords :
Ge-Si alloys; bipolar analogue integrated circuits; circuit tuning; modems; phase noise; semiconductor materials; voltage-controlled oscillators; 0.9 micron; HBT technology; SiGe; buffering; cable modem receivers; double-conversion receiver; monolithic VCO; phase noise characteristics; wide-tuning-range dual-VCO; Circuit optimization; Digital video broadcasting; Frequency; Heterojunction bipolar transistors; Modems; Phase noise; Tuning; Varactors; Voltage-controlled oscillators; Wideband;
Conference_Titel :
Microwave Symposium Digest, 2002 IEEE MTT-S International
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-7803-7239-5
DOI :
10.1109/MWSYM.2002.1011687
