Patent ID: 7595732
Filing Date: 2009-09-29
Classification: G06K

Abstract:
1. A power generating circuit comprises: an antenna operably coupled to receive a radio frequency (RF) signal; a rectifying module operably coupled to convert the RF signal into a voltage, wherein the rectifying module includes a plurality of cells, wherein a first one of the cells converts the RF signal into a first voltage that is further increased by a remainder of the plurality of cells into the voltage; and a tuning module operably coupled to tune the rectifying module in accordance with the RF signal to obtain a desired frequency response of the power generating circuit, wherein a cell of the plurality of cells includes: a first capacitor having a first connection and a second connection, wherein the first connection is coupled to receive the RF signal; a first transistor having a control node, a source node, and a return node, wherein the control node and source node of the first transistor are coupled to the second connection of the first capacitor; a second transistor having a control node, a source node, and a return node, wherein the source node of the second transistor is coupled to the second connection of the first capacitor; and a second capacitor having a first connection and a second connection, wherein the second connection of the second capacitor is coupled to the control node and return node of the second transistor and the first connection of the second capacitor is coupled to the return node of the first transistor to produce an output of the cell.