# US 11,309,740 B2 · Method and system for a complementary metal oxide semiconductor wireless power receiver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,740 B2 - Document ID: US11309740B2 - Status: Granted - Kind: B2 - Application number: 17/087,140 - Filed: 2020-11-02 - Published: 2021-05-13 - Granted: 2022-04-19 - Earliest claimed: 2013-09-15 - Assignees: The Governing Council of the University of Toronto - Applicants: The Governing Council of the University of Toronto - Inventors: Meysam Zargham; Glenn Gulak - Web page: https://patentgrep.com/patent/US11309740B2 ## CPC - H02J 50/001: {Energy harvesting or scavenging} - H01F 38/14: Inductive couplings - H02J 50/10: using inductive coupling - H02J 50/12: of the resonant type - H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields - H04B 5/24: Inductive coupling - H04B 5/79: for data transfer in combination with power transfer - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H04B: TRANSMISSION ## Abstract Methods and systems for a complementary metal oxide semiconductor wireless power receiver may include a receiver chip with an inductor, a configurable capacitance, and a rectifier. The method may include receiving an RF signal utilizing the inductor, extracting a clock signal from the received RF signal, generating a DC voltage utilizing a rectifier circuit, sampling the DC voltage, and adjusting the configurable capacitance based on the sampled DC voltage. The rectifier circuit may include CMOS transistors and T-gate switches for coupling to the inductor. The T-gate switches may be controlled by the generated DC voltage. A signed based gradient-descent algorithm may be utilized to maximize the DC voltage. The DC voltage may be sampled utilizing a comparator powered by the DC voltage, which may adaptively configure the capacitance. The inductor may be shielded utilizing a floating shield. The DC voltage may be increased utilizing a voltage-boosting rectifier. ## Claims ### Claim 1 A method for wireless power transfer, the method comprising: in a chip with a configurable capacitance and a rectifier: receiving a wireless signal; generating, utilizing the rectifier, a DC voltage based on the received wireless signal; sampling the DC voltage; and adjusting the configurable capacitance based on the sampled DC voltage. ### Claim 2 (depends on 1) The method according to claim 1, wherein the rectifier comprises complementary metal oxide semiconductor transistors and T-gate switches. ### Claim 3 (depends on 2) The method according to claim 2, wherein the T-gate switches are controlled by the generated DC voltage. ### Claim 4 (depends on 1) The method according to claim 1, comprising utilizing a signed based gradient descent algorithm to maximize the generated DC voltage. ### Claim 5 (depends on 1) The method according to claim 1, comprising sampling the DC voltage utilizing a comparator powered by the generated DC voltage. ### Claim 6 (depends on 1) The method according to claim 1, comprising adaptively configuring the configurable capacitance based on the sampled DC voltage. ### Claim 7 (depends on 1) The method according to claim 1, wherein an inductor for receiving the wireless signal is shielded utilizing a floating shield and/or tapering. ### Claim 8 (depends on 7) The method according to claim 7, wherein the inductor comprises a plurality of parallel conductive metal strips. ### Claim 9 (depends on 1) The method according to claim 1, wherein the chip is a CMOS chip. ### Claim 10 (depends on 1) The method according to claim 1, comprising increasing the generated DC voltage utilizing a voltage-boosting rectifier. ### Claim 11 A system for wireless power transfer, the system comprising: a chip with a configurable capacitance and a rectifier, said receiver chip being operable to: receive a wireless signal; generate, utilizing the rectifier, a DC voltage based on the received wireless signal; sample the DC voltage; and adjust the configurable capacitance based on the sampled DC voltage. ### Claim 12 (depends on 11) The system according to claim 11, wherein the rectifier comprises complementary metal oxide semiconductor transistors and T-gate switches. ### Claim 13 (depends on 12) The system according to claim 12, wherein the T-gate switches are controlled by the generated DC voltage. ### Claim 14 (depends on 11) The system according to claim 11, wherein the chip is operable to utilize a signed based gradient-descent algorithm to maximize the generated DC voltage. ### Claim 15 (depends on 11) The system according to claim 11, wherein the chip is operable to sample the DC voltage utilizing a comparator powered by the generated DC voltage. ### Claim 16 (depends on 11) The system according to claim 11, wherein the chip is operable to adaptively configure the configurable capacitance based on the sampled DC voltage. ### Claim 17 (depends on 11) The system according to claim 11, wherein an inductor for receiving the wireless signal is shielded utilizing a floating shield and/or tapering. ### Claim 18 (depends on 17) The system according to claim 17, wherein the inductor comprises a plurality of parallel conductive metal strips. ### Claim 19 (depends on 11) The system according to claim 11, wherein the chip is operable to increase the generated DC voltage utilizing a voltage-boosting rectifier. ### Claim 20 A system for wireless power transfer, the system comprising: a chip with a configurable capacitance and a rectifier, said chip being operable to: receive a wireless signal through a biological media; generate, utilizing the rectifier, a DC voltage based on the received wireless signal; sample the DC voltage utilizing a comparator with an output coupled to an adaptation circuit; and adjust the configurable capacitance utilizing the adaptation circuit.