Title :
A broadband upconverter unit for a cable-modem double-conversion receiver
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. In experimental testing the unit measures over 20 dB gain with 8-dB noise figure and 15-dB gain tuning. The unit is implemented in a 0.9-μm SiGe bipolar process.
Keywords :
Ge-Si alloys; UHF frequency convertors; UHF integrated circuits; bipolar integrated circuits; modems; radio receivers; semiconductor materials; 0.9 micron; 1575 MHz; 20 dB; 47 to 862 MHz; 8 dB; LO generation; PLL; SiGe bipolar process; broadband upconverter unit; cable modem; divide-by-two circuit; double-balanced mixer; double-conversion receiver; three-stage VCO bank; variable-gain low-noise amplifier; Circuit testing; Frequency; Gain measurement; Low-noise amplifiers; Measurement units; Modems; Noise figure; Noise measurement; Phase locked loops; Voltage-controlled oscillators;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2003 IEEE
Print_ISBN :
0-7803-7694-3
DOI :
10.1109/RFIC.2003.1213982
