A complex band-pass filter for low-IF conversion DAB/T-DMB tuner with I/Q mismatch calibration

This paper provides a complex band-pass filter (BPF) for low-IF conversion digital audio broadcasting (DAB) and terrestrial-digital multimedia broadcasting (T-DMB) tuner with I/Q gain and phase mismatch calibration. This calibration can be implemented in the first stage of complex BPF using feed-thr...

Full description

Saved in:
Bibliographic Details
Main Authors: Seyeob Kim, Minsu Jeong, Yanggyun Kim, Bonkee Kim, Taeju Lee, Kangho Lee, Bo-Eun Kim
Format: Conference Proceeding
Language:English
Subjects:
Band pass filters
Calibration
Circuit optimization
Clocks
CMOS technology
Digital audio broadcasting
Digital multimedia broadcasting
Frequency
Multimedia communication
Tuners
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper provides a complex band-pass filter (BPF) for low-IF conversion digital audio broadcasting (DAB) and terrestrial-digital multimedia broadcasting (T-DMB) tuner with I/Q gain and phase mismatch calibration. This calibration can be implemented in the first stage of complex BPF using feed-through resistor calibration scheme. The automatic tuning circuit with programmable clock is also presented. The measurement results show 1.536 MHz bandwidth with 2.048 MHz IF center frequency and 50 dB stop band attenuation at 0.7 MHz frequency offset. The in-band and out-band 3 rd order intermodulation distortion (IMD3) are 55 and 60 dBc, respectively. After I/Q mismatch calibrating, 20 dB image rejection ratio (IRR) improvement is obtained from 38 dB to 58 dB in this work. The automatic tuning circuit guarantees less than +/- 4 % cut-off frequency variation covering the several clock requirements from demodulator ICs. The complex BPF is fabricated in 0.13 mum RF CMOS technology and consumes 9 mA with 1.2 V power supply.
DOI:10.1109/ASSCC.2008.4708830