Title :
Radio specifications of double conversion tuner for cable modem
Author :
Cha, Choong-Yul ; Choi, Jeong-Ki ; Kwon, Hyo-Seok ; Lee, Sang-Gug
Author_Institution :
RF Microelectronics Laboratory, Information & Commun. Univ., Daejeon, South Korea
Abstract :
The radio specifications such as noise figure, phase noise, image rejection ratio, CTB, CSO, XMOD, power gain, and AGC range of the tuner for cable modem is analyzed based on DOCSIS and many reported materials. Using the analyzed radio specifications, the specific radio specifications are allocated for up and down converter of the DC tuner architecture and analyzed CTB and CSO requirement in depth. According to the linearity analysis for the DC tuner architecture, it is known that CTB and CSO value of -53dBc, which is commonly accepted by the field engineer, is over-specified. By the more reasonable selection of linearity target, it is possible to design DC tuner with better power efficiency.
Keywords :
automatic gain control; cable television; circuit tuning; frequency convertors; modems; modulation; phase noise; DC tuner architecture; automatic gain control range; cable modem; composite second order; composite triple beats; cross modulation; double conversion tuner; down converter; image channel interference; image rejection ratio; linearity analysis; noise figure; packed channels; phase noise; power gain; radio specifications; up converter; Cable TV; Communication cables; Image converters; Interference; Linearity; Modems; Radio frequency; Surface acoustic waves; Tuners; Web and internet services;
Journal_Title :
Consumer Electronics, IEEE Transactions on
DOI :
10.1109/TCE.2003.1261229
