TY - GEN
T1 - A charge sharing based harmonic-reject mixer for RF applications
AU - Ensafdaran, Masoud
AU - Namgoong, Won
PY - 2013
Y1 - 2013
N2 - Harmonic-reject mixers are required in receivers to prevent signals near the LO harmonics from introducing large interferences into the desired signal band. To achieve high attenuation of interferers in harmonic-reject mixers, sub-mixings with accurate gain are required. Existing oversampling harmonic-reject mixer structures employ either three or four mixers with different gains. A harmonic-reject mixer that employs only two mixers with the same gains is proposed to minimize mismatch. Instead of varying the mixer gain, charge sharing is used to implement gain factors with high matching and accuracy. As only two clocks are required for the two signal paths, the layout is greatly simplified and high matching is possible. A prototype circuit has been designed in 65nm CMOS, and the amount of rejection for 3rd and 5th harmonic are simulated to be 44dB and 46dB, respectively. The mixer has a noise figure of 13dB and an IIP3 of -3.1dBm and consumes 11mA at 1.2V supply voltage.
AB - Harmonic-reject mixers are required in receivers to prevent signals near the LO harmonics from introducing large interferences into the desired signal band. To achieve high attenuation of interferers in harmonic-reject mixers, sub-mixings with accurate gain are required. Existing oversampling harmonic-reject mixer structures employ either three or four mixers with different gains. A harmonic-reject mixer that employs only two mixers with the same gains is proposed to minimize mismatch. Instead of varying the mixer gain, charge sharing is used to implement gain factors with high matching and accuracy. As only two clocks are required for the two signal paths, the layout is greatly simplified and high matching is possible. A prototype circuit has been designed in 65nm CMOS, and the amount of rejection for 3rd and 5th harmonic are simulated to be 44dB and 46dB, respectively. The mixer has a noise figure of 13dB and an IIP3 of -3.1dBm and consumes 11mA at 1.2V supply voltage.
UR - https://www.scopus.com/pages/publications/84882755199
U2 - 10.1109/WMCaS.2013.6563562
DO - 10.1109/WMCaS.2013.6563562
M3 - Conference contribution
SN - 9781479904556
T3 - Proceedings of the 2013 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems, WMCS 2013
BT - Proceedings of the 2013 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems, WMCS 2013
T2 - 2013 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems, WMCS 2013
Y2 - 4 April 2013 through 5 April 2013
ER -