TY - GEN
T1 - An even harmonic image rejection mixer using an eight-phase polyphase filter
AU - Shimozawa, Mitsuhiro
AU - Nakajima, Kensuke
AU - Ueda, Hiroomi
AU - Tadokoro, Tomohiro
AU - Suematsu, Noriharu
PY - 2008
Y1 - 2008
N2 - Since an even harmonic mixer is pumped by LO with half the frequency compared with the fundamental mixer, LO can be generated and amplified easily with lower current consumption. When it is applied to the quadrature mixer (QMIX) or the image rejection mixer (IRM), a 90 degree phase shifter In the RF signal path or a 45 degree phase shifter in the LO path is required. As a 90 degree phase shifter for RF path increases loss of the RF signal and degrades noise figure of the receiver, a configuration with a 45 degree phase shifter is better for QMIX or IRM. In this paper, a novel LO divider using eight-phase polyphase filters (PPF) and the even harmonic IRM using thé proposed LO divider are presented. A proposed LO divider divides the input differential signal into the four differential signals with 45 degree phase difference and it can be applied for the IRM using even harmonic mixer. A developed even harmonic IRM with an eight-phase PPF fabricated by SiGe BiCMOS process achieved more than 20dB of the Image rejection ratio in 5.8GHz-band.
AB - Since an even harmonic mixer is pumped by LO with half the frequency compared with the fundamental mixer, LO can be generated and amplified easily with lower current consumption. When it is applied to the quadrature mixer (QMIX) or the image rejection mixer (IRM), a 90 degree phase shifter In the RF signal path or a 45 degree phase shifter in the LO path is required. As a 90 degree phase shifter for RF path increases loss of the RF signal and degrades noise figure of the receiver, a configuration with a 45 degree phase shifter is better for QMIX or IRM. In this paper, a novel LO divider using eight-phase polyphase filters (PPF) and the even harmonic IRM using thé proposed LO divider are presented. A proposed LO divider divides the input differential signal into the four differential signals with 45 degree phase difference and it can be applied for the IRM using even harmonic mixer. A developed even harmonic IRM with an eight-phase PPF fabricated by SiGe BiCMOS process achieved more than 20dB of the Image rejection ratio in 5.8GHz-band.
KW - Even harmonic mixer
KW - IRM
KW - Image rejection mixer
KW - Polyphase filter
UR - http://www.scopus.com/inward/record.url?scp=57349158772&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=57349158772&partnerID=8YFLogxK
U2 - 10.1109/MWSYM.2008.4633061
DO - 10.1109/MWSYM.2008.4633061
M3 - Conference contribution
AN - SCOPUS:57349158772
SN - 9781424417810
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 1485
EP - 1488
BT - 2008 IEEE MTT-S International Microwave Symposium Digest, MTT
T2 - 2008 IEEE MTT-S International Microwave Symposium Digest, MTT
Y2 - 15 June 2008 through 20 June 2008
ER -