... present a multi-layer active feedback structure which mainly composes a transimpedance stage and a gain stage followed by a low pass filter. This structure enables to achieve improved input impedance and superior gain. A simplified cascaded amplifier has also been designed in a hierarchical topology...

...Sajjad Shieh; Mahmoud Kamarei Purpose The purpose of the paper is to present a frequency-changing technique to realize a fast start-up radio frequency (RF) energy harvester. Design/methodology/Approach First, a simple analysis of the input impedance of the rectifier circuit is presented...