Conference Proceeding

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

12/2008; DOI:10.1109/ASSCC.2008.4708830 pp.473 - 476 In proceeding of: Solid-State Circuits Conference, 2008. A-SSCC '08. IEEE Asian
Source: IEEE Xplore

ABSTRACT 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 3rd 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.

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Keywords

0.13 mum RF CMOS technology
 
20 dB image rejection ratio
 
automatic tuning circuit guarantees
 
band attenuation
 
BPF
 
complex band-pass filter
 
complex BPF
 
consumes 9 mA
 
demodulator ICs
 
feed-through resistor calibration scheme
 
I/Q mismatch calibrating
 
in-band
 
IRR
 
low-IF conversion digital audio broadcasting
 
measurement results
 
MHz
 
MHz bandwidth
 
MHz frequency
 
out-band 3<sup>rd</sup> order intermodulation distortion
 
terrestrial-digital multimedia broadcasting