Title :
Fast Automatic Tuning of Channel Selection Filters Based on Phase Delay Calibration
Author :
Kagoshima, Kanetomo ; Kawama, Shuichi ; Toyoyama, Shinji ; Iizuka, Kunihiko
Author_Institution :
Sharp Corp., Tenri
Abstract :
An automatic tuning method for active-RC base-band filters used in direct conversion receivers is proposed. Filter calibration is realized by setting the phase delay for a reference frequency of 4.5 MHz to -360deg. The proposed method is accurate and area efficient, since it does not require a replica filter but uses the filter itself. In addition, monotonic control of the capacitor arrays makes fast tuning possible. A pair of base band filters for DVB-H receivers including this automatic tuning method was fabricated using a 0.5mum SiGe Bi-CMOS process. The accuracy of the tuning is limited by the resolution of the binary capacitor-array and is 12deg. This corresponds to a worst case cutoff frequency deviation of 300 kHz. The tuning takes 113.8musec
Keywords :
BiCMOS integrated circuits; Ge-Si alloys; RC circuits; active filters; calibration; channel bank filters; circuit tuning; radio receivers; 0.5 micron; 113.8 mus; 4.5 MHz; DVB-H receivers; SiGe; SiGe BiCMOS process; active-RC filters; automatic tuning method; baseband filters; binary capacitor-array; channel selection filters; direct conversion receivers; filter calibration; monotonic control; phase delay calibration; Automatic control; Calibration; Capacitors; Delay; Digital video broadcasting; Filters; Frequency; Germanium silicon alloys; Silicon germanium; Tuning;
Conference_Titel :
Custom Integrated Circuits Conference, 2006. CICC '06. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
1-4244-0075-9
Electronic_ISBN :
1-4244-0076-7
DOI :
10.1109/CICC.2006.320842
