Title :
An I/Q active balanced harmonic mixer with IM2 cancelers and a 45/spl deg/ phase shifter
Author :
Yamaji, T. ; Tanimoto, H. ; Kokatsu, H.
Author_Institution :
Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan
Abstract :
An active I/Q harmonic mixer with IM2 cancelers and a 45/spl deg/ phase shifter for direct downconversion has two advantages. One is small self-mixing dc offset because of harmonic mixing, and the other is small and frequency insensitive 2/sup nd/ order intermodulation (IM2). The proposed 45/spl deg/ phase shifter has low element sensitivity. The measured 37 dBm IIPB and 3/spl deg/ phase error indicate that the integrated direct downconverter with harmonic mixers is applicable even for QPSK signals that have an amplitude modulation component.
Keywords :
intermodulation; mixers (circuits); phase shifters; DC offset; I/Q active balanced harmonic mixer; IIP2; IM2 canceler; QPSK signal; amplitude modulation; integrated direct downconverter; phase shifter; second order intermodulation; self-mixing; Frequency; Phase shifters;
Conference_Titel :
Solid-State Circuits Conference, 1998. Digest of Technical Papers. 1998 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-4344-1
DOI :
10.1109/ISSCC.1998.672535
