Title :
An I/Q active balanced harmonic mixer with IM2 cancelers and a 45° phase shifter
Author :
Yamaji, Takafumi ; Tanimoto, Hiroshi ; Kokatsu, Hideyuki
Author_Institution :
Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan
fDate :
12/1/1998 12:00:00 AM
Abstract :
To reduce DC offset caused by local-oscillator-signal self-mixing in a direct-conversion receiver, an active balanced harmonic mixer with second-order intermodulation (IM2) canceler was proposed, and a direct downconverter containing the mixer and a 45° phase shifter was fabricated on a BiCMOS chip. The dc offset caused by the self-mixing was measured and found to be smaller than the noise level. A second-order intercept point at the input of +37 dBm was achieved with the IM2 canceler, which is suitable for direct conversion receivers for quadrature phase-shift keying signals containing an amplitude modulation component
Keywords :
BiCMOS analogue integrated circuits; UHF integrated circuits; UHF mixers; UHF phase shifters; harmonics; intermodulation distortion; personal communication networks; radio receivers; BiCMOS chip; I/Q active balanced harmonic mixer; IM2 cancelers; direct downconverter; direct-conversion receiver; local-oscillator-signal self-mixing; phase shifter; quadrature phase-shift keying signals; second-order intercept point; second-order intermodulation; Baseband; BiCMOS integrated circuits; Mixers; Noise level; Noise measurement; Phase shifters; RF signals; Radio frequency; Radiofrequency amplifiers; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
