Title :
A 43dB ACR low-pass filter with automatic tuning for low-IF conversion DAB/T-DMB tuner IC
Author :
Kim, Seyeob ; Kim, Bonkee ; Jeong, Min-Su ; Lee, Jung-Hwan ; Cho, Youngho ; Kim, Tae Wook ; Kim, Bo-Eun
Author_Institution :
Integrant Technol. Inc., Gyeonggi, South Korea
Abstract :
This paper provides a channel select low-pass filter with automatic cut-off frequency tuning circuit for low-IF conversion digital audio broadcasting (DAB) and terrestrial-digital multimedia broadcasting (T-DMB) tuner IC. This filter has 1.58MHz cut-off frequency, 20dB and 65dB stop band attenuation at 1.9MHz and 2.4MHz, respectively. The in-band IIP3 is -8.4dBV and 1dB desensitization is satisfied for 490mVpp interferer at 1.7MHz frequency offset. By using simple automatic tuning technique, less than +/-1.5% cut-off frequency error and more than 40dB adjacent channel rejection (ACR) are obtained. The low-pass filter is fabricated in 0.18μm CMOS technology and consumes about 4.5mA with 1.8V power supply.
Keywords :
CMOS integrated circuits; UHF filters; adjacent channel interference; circuit tuning; digital audio broadcasting; digital video broadcasting; low-pass filters; multimedia communication; 0.18 micron; 1.58 MHz; 1.7 MHz; 1.8 V; 1.9 MHz; 2.4 MHz; CMOS technology; adjacent channel rejection; automatic tuning technique; cut-off frequency error; cut-off frequency tuning circuit; digital audio broadcasting; low-IF conversion; low-pass filter; stop band attenuation; terrestrial-digital multimedia broadcasting; tuner integrated circuit; CMOS technology; Circuit optimization; Cutoff frequency; Digital audio broadcasting; Digital filters; Digital integrated circuits; Frequency conversion; Low pass filters; Tuned circuits; Tuners;
Conference_Titel :
Solid-State Circuits Conference, 2005. ESSCIRC 2005. Proceedings of the 31st European
Print_ISBN :
0-7803-9205-1
DOI :
10.1109/ESSCIR.2005.1541624
