Title :
A broadband upconverter unit for double-conversion receivers
Author :
Stadius, Kari ; Malinen, Arto ; Paatsila, Petteri ; Halonen, Kari
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Finland
Abstract :
A broadband upconverter unit for double-conversion receivers used in cable modems is presented in this paper. The unit includes a variable-gain low-noise amplifier, a double-balanced mixer, a three-stage VCO bank for LO generation and a divide-by-two circuit for driving an external PLL. The unit upconverts a 6- or 8-MHz channel from 47-862 MHz input band to around 1575 MHz intermediate frequency with 24-dB gain. The unit has 15-dB gain tuning range, linearity (OIP3) better than 62 dBmV and below 7-dB noise figure. The circuits are fabricated in a 0.9-μm SiGe bipolar process.
Keywords :
Ge-Si alloys; UHF frequency convertors; UHF integrated circuits; circuit tuning; dividing circuits; modems; voltage-controlled oscillators; 0.9 micron; 1575 MHz; 24 dB; SiGe; SiGe bipolar process; broadband upconverter unit; cable modems; divide-by-two circuit; double-balanced mixer; double-conversion receivers; intermediate frequency; linearity; three-stage VCO bank; tuning range; variable-gain low-noise amplifier; Circuit optimization; Frequency; Linearity; Low-noise amplifiers; Modems; Noise figure; Phase locked loops; Silicon germanium; Tuning; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1205925
