Title :
An IIP2 calibration technique for direct conversion receivers
Author :
Hotti, M. ; Ryynanen, J. ; Kivekas, K. ; Halonen, K.
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
An improvement for a previously published IIP2 calibration method for a Gilbert cell type mixer is introduced. In the previous solution the IIP2 was degraded as a function of the baseband frequency when a mixer with RC load was used. This solution maintains a high IIP2 over the entire baseband channel in wideband systems. In order to implement an on-chip tuning engine the correct trimming code has to be detected. Two different solutions for the detection of the correct trimming code are discussed in this paper.
Keywords :
calibration; intermodulation distortion; mixers (circuits); radio receivers; telecommunication channels; Gilbert cell type mixer; IIP2 calibration; RC load; baseband channel; baseband frequency; direct conversion receivers; on-chip tuning engine; trimming code; wideband systems; Baseband; Calibration; Capacitors; Degradation; Electronic circuits; Frequency; Intermodulation distortion; Resistors; Transconductance; Tuning;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328989
