Title :
An 8GHz multi-beam spatio-spectral beamforming receiver using an all-passive discrete time analog baseband in 65nm CMOS
Author :
Patnaik, Satwik ; Kalia, Sachin ; Sadhu, Bodhisatwa ; Sturm, Martin ; Elbadry, Mohammad ; Harjani, Ramesh
Author_Institution :
Univ. of Minnesota, Minneapolis, MN, USA
Abstract :
A novel multi-frequency beamforming front-end is proposed. The proposed front-end allows for simultaneous and independent steering of multiple frequency beams. As proof of concept, an 8GHz 2-channel, 4-frequency phased array beam-former is designed and implemented in 65nm CMOS. The IF signal on each channel is frequency split using an all passive 4-point analog FFT. The orthogonal frequency outputs are then beam steered using an all passive I-Q vector combiner. The RF circuit draws 22.8mA from a 1.2V supply while the analog baseband consumes 9pJ/conv. (135μW at 120MSps).
Keywords :
CMOS integrated circuits; array signal processing; discrete time systems; fast Fourier transforms; low-power electronics; microwave receivers; 2-channel phased array beam-former; 4-frequency phased array beam-former; CMOS; IF signal; RF circuit; all passive I-Q vector combiner; all-passive discrete time analog baseband; current 22.8 mA; frequency 8 GHz; frequency split; multibeam spatio-spectral beamforming receiver; multifrequency beamforming front-end; multiple frequency beam; orthogonal frequency output; passive 4-point analog FFT; power 135 muW; size 65 nm; voltage 1.2 V; Array signal processing; Baseband; Frequency measurement; Mixers; Radio frequency; Receivers; Vectors;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2012 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4673-1555-5
Electronic_ISBN :
0886-5930
DOI :
10.1109/CICC.2012.6330615
