Abstract:
We propose a calibration procedure to compensate for gain and phase mismatch errors in RF I/Q downconversion stages requiring neither external reference signals nor adapt...Show MoreMetadata
Abstract:
We propose a calibration procedure to compensate for gain and phase mismatch errors in RF I/Q downconversion stages requiring neither external reference signals nor adaptive techniques. The proposed indirect compensation technique is based on the use of the local oscillator (LO) signal as the reference for error measurements. A number of mismatch parameters are first estimated by an algorithm running in the DSP after the analog-to-digital (A/D) converter and then used to correct the downconverted signal digitally during normal operation. A test circuit has been designed in 0.13 /spl mu/m CMOS technology and it is under fabrication. Circuit simulations exhibit an image-rejection ratio, IRR, of about 60 dB for a LO 1% amplitude and 3/spl deg/ phase mismatch.
Date of Conference: 23-26 May 2005
Date Added to IEEE Xplore: 25 July 2005
Print ISBN:0-7803-8834-8