Wide-tuning-range dual-VCOs for cable modem receivers

Author

Stadius, K. ; Halonen, K.

Author_Institution

Electron. Circuit Design Lab., Helsinki Univ. of Technol., Finland

fYear

2002

fDate

3-4 June 2002

Firstpage

471

Lastpage

474

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; heterojunction bipolar transistors; modems; phase noise; receivers; semiconductor materials; voltage-controlled oscillators; 0.9 micron; LO generation; SiGe; SiGe HBT technology; cable modem; double-conversion receiver; dual-VCO; phase noise; tuning range; wideband monolithic LC-VCO; Circuit optimization; Digital video broadcasting; Frequency; Heterojunction bipolar transistors; Modems; Phase noise; Tuning; Varactors; Voltage-controlled oscillators; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits (RFIC) Symposium, 2002 IEEE

Conference_Location

Seattle, WA, USA

ISSN

1529-2517

Print_ISBN

0-7803-7246-8

Type

conf

DOI

10.1109/RFIC.2002.1012094

Filename

1012094