Title :
A CMOS Harmonic Rejection Mixer With Mismatch Calibration Circuitry for Digital TV Tuner Applications
Author :
Cha, Hyouk-Kyu ; Song, Seong-Sik ; Kim, Hong-Teuk ; Lee, Kwyro
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon
Abstract :
A harmonic rejection mixer with mismatch calibration circuitry in direct-conversion receiver architecture for digital TV tuner applications is designed and fabricated in 0.18-mum CMOS technology. Odd harmonic mixing in the 48-862 MHz digital TV frequency band between the input signal and the local oscillator harmonics is a critical problem for direct-conversion receivers which require a harmonic rejection of over -60 dBc for ATSC terrestrial and cable digital TV standards. Without calibration, harmonic rejection mixers show a rejection ratio of the third and fifth harmonics in the range of -30 to -40 dBc due to phase and/or gain mismatch. The implemented harmonic rejection mixer with the proposed calibration circuitry consistently achieves more than -70 dBc of third harmonic rejection without degrading other performances such as gain, noise figure, linearity, and power consumption.
Keywords :
CMOS integrated circuits; UHF mixers; cable television; calibration; digital television; oscillators; ATSC terrestrial standards; CMOS harmonic rejection mixer; cable digital TV standards; digital TV tuner applications; direct-conversion receiver architecture; frequency 48 MHz to 862 MHz; local oscillator harmonics; mismatch calibration circuitry; noise figure; power consumption; size 0.18 mum; CMOS digital integrated circuits; CMOS technology; Calibration; Digital TV; Frequency; Local oscillators; Power system harmonics; TV receivers; Tuned circuits; Tuners; ATSC; CMOS; digital TV tuner; harmonic rejection mixer; mismatch calibration;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2008.2002463
