TY - JOUR
T1 - A 4-element phased-array system with simultaneous spatial- and frequency-domain filtering at the antenna inputs
AU - Ghaffari, A.
AU - Klumperink, Eric A.M.
AU - van Vliet, Frank Edward
AU - Nauta, Bram
PY - 2014/6/1
Y1 - 2014/6/1
N2 - To reject strong interference in excess of 0 dBm, a 4- element LO-phase shifting phased-array receiver with 8-phase passive mixers terminated by baseband capacitors is presented. The passive mixers upconvert both the spatial and frequency domain filtering from baseband to RF, hence realizing blocker suppression directly at the antenna inputs. A comprehensive mathematical model provides a set of closed-form equations describing the spatial and frequency domain filtering including imperfections. A prototype is realized in 28 nm CMOS. It exploits third harmonic reception to achieve a wide RF-frequency range from 0.6–4.5 GHz at 34–119 mW power dissipation, while also providing impedance matching. Out of the band/beam, a 1 dB-compression point as high as +12/+10 dBm has been measured. The 1-element noise figure over the RF-frequency range is 4–6.3 dB, while in-beam/band IIP3 values of 0– +2.6 dBm are measured. This proposed technique can be instrumental to make RF receivers more robust for interference, while still being flexibly tunable in frequency.
AB - To reject strong interference in excess of 0 dBm, a 4- element LO-phase shifting phased-array receiver with 8-phase passive mixers terminated by baseband capacitors is presented. The passive mixers upconvert both the spatial and frequency domain filtering from baseband to RF, hence realizing blocker suppression directly at the antenna inputs. A comprehensive mathematical model provides a set of closed-form equations describing the spatial and frequency domain filtering including imperfections. A prototype is realized in 28 nm CMOS. It exploits third harmonic reception to achieve a wide RF-frequency range from 0.6–4.5 GHz at 34–119 mW power dissipation, while also providing impedance matching. Out of the band/beam, a 1 dB-compression point as high as +12/+10 dBm has been measured. The 1-element noise figure over the RF-frequency range is 4–6.3 dB, while in-beam/band IIP3 values of 0– +2.6 dBm are measured. This proposed technique can be instrumental to make RF receivers more robust for interference, while still being flexibly tunable in frequency.
KW - EWI-24799
KW - IR-91362
KW - METIS-304116
U2 - 10.1109/JSSC.2014.2314439
DO - 10.1109/JSSC.2014.2314439
M3 - Article
VL - 49
SP - 1303
EP - 1316
JO - IEEE journal of solid-state circuits
JF - IEEE journal of solid-state circuits
SN - 0018-9200
IS - 6
ER -