Naga Rajesh Shanthi Pavan Design of Lumped-Component Programmable Delay Elements for Ultra-Wideband Beamforming. 1800-1814 2014 49 IEEE J. Solid State Circuits 8 https://doi.org/10.1109/JSSC.2014.2317132 db/journals/jssc/jssc49.html#RajeshP14