Abstract: Systems and methods for utilizing a small form-factor, wirelessly powered transceiver are disclosed. In one embodiment, a wireless powered transceiver includes a receive antenna configured to receive a receive signal, a transmit antenna configured to transmit a transmit signal, a power harvesting system including a rectifier circuit configured convert radio frequency energy from the receive signal into DC (direct current) voltage, and a power management unit (PMU) configured to set the operating mode and biasing condition of the receive and transmit circuitry blocks and provide DC voltage from the receive circuitry block to the transmit circuitry block to maintain a minimum voltage, a receiver circuitry block configured to provide energy from the receive signal to the power harvesting system, and a transmitter circuitry block including a data modulator circuit, the data modulator circuit configured to generate the transmit signal using DC voltage received from the power management unit.

Abstract: Systems and method for wireless recording system-on-chips for distributed neural interface systems with inductive power delivery and UWB data transmission are described. In an embodiment, the system includes an implantable neural interface including: an electrode array having several electrodes; front end circuitry including: one or more digital components, and at least one amplifier coupled to a first electrode and a second electrode of the electrode array, wherein the amplifier and the first electrode and the second electrode form a sensing channel configured to sense electrical activity; and a transceiver including: several digital components; a power harvesting system that receives RF energy through a wireless power link; and a wireless clock receiver that provides a clock signal to the one or more digital components of the front end circuitry and the several digital components of the transceiver.

Abstract: Systems and methods for heart stimulation in accordance with embodiments of the invention are illustrated.

Abstract: Certain aspects of the present disclosure provide methods and apparatus for performing electron paramagnetic resonance (EPR) spectroscopy on a fluid from a flowing well, such as fluid from hydrocarbon recovery operations flowing in a downhole tubular, wellhead, or pipeline. One example method generally includes, for a first EPR iteration, performing a first frequency sweep of discrete electromagnetic frequencies on a cavity containing the fluid; determining first parameter values of reflected signals from the first frequency sweep; selecting a first discrete frequency corresponding to one of the first parameter values that is less than a threshold value; activating a first electromagnetic field in the fluid at the first discrete frequency; and while the first electromagnetic field is activated, performing a first DC magnetic field sweep to generate a first EPR spectrum.

Abstract: Certain aspects of the present disclosure provide methods and apparatus for closed-loop control of a system using one or more electron paramagnetic resonance (EPR) sensors located on-site. With such EPR sensors, a change can be applied to the system, the EPR sensors can measure the effect(s) of the change, and then adjustments can be made in real-time. This feedback process may be repeated continuously to control the system.

Abstract: Wireless treatment of arrhythmias. At least some of the example embodiments are methods including: charging a capacitor of a first microchip device abutting heart tissue, the charging by harvesting ambient energy; charging a capacitor of a second microchip device abutting the heart tissue, the charging of the capacitor of the second microchip device by harvesting ambient energy; sending a command wirelessly from a communication device outside the rib cage to the microchip devices; applying electrical energy to the heart tissue by the first microchip device responsive to the command, the electrical energy applied from the capacitor of the first microchip device; and applying electrical energy to the heart tissue by the second microchip device responsive to the command to the second microchip device, the electrical energy applied from the capacitor of the second microchip device.

Abstract: Distributed wireless sensor networks are described. In an embodiment, a distributed wireless sensor network (WSN) system includes: a set of wirelessly powered microchips, and a radio frequency (RF) transceiver, wherein the RF transceiver is configured to transmit RF signals, several of the set of wirelessly powered microchips is configured to be activated when placed in proximity to the RF transceiver transmitting RF signals, each of the several sets of wirelessly powered microchips is configured to radiate back a signal, and the signals radiated by the set of wirelessly powered microchips is coherent in phase and frequency to the RF transceiver.

Abstract: Wirelessly powered and controlled implantable stimulator system in accordance with embodiments of the invention are described. One embodiment includes: a transmitter (TX) coil wirelessly powering and controlling several implantable stimulators though electromagnetic waves that include modulated waveforms that include n-bit passcodes to individually control stimulation of each of the plurality of implantable stimulators; where an implantable stimulator of the several implantable stimulators includes: a receiver (RX) for receiving a modulated waveform from the TX coil, where the implantable stimulator is controlled based on the modulated waveform.

Abstract: Wirelessly powered receiver system and sensors are described. In an embodiment, the power receiver system, includes an inductive coil that receives wireless power from an external transmitter, a capacitor bank that optimizes power transfer to an energy harvesting device, and a power-receiving frontend RF-DC rectifier with a periodically enabled closed feedback loop that adapts settings of the capacitor bank in real-time to adapt to changes on the inductive coil to maximize power transfer efficiency.

Abstract: Certain aspects of the present disclosure provide methods and apparatus for closed-loop control of a system using one or more electron paramagnetic resonance (EPR) sensors located on-site. With such EPR sensors, a change can be applied to the system, the EPR sensors can measure the effect(s) of the change, and then adjustments can be made in real-time. This feedback process may be repeated continuously to control the system.

Abstract: Systems and methods for modulation and demodulation using a micro-Doppler effect are described. In an embodiment, the method includes radiating, using a picosecond pulse generator with an antenna, a train of THz pulses that form a frequency comb, where the frequency comb is reflected from an object such that the frequency several tones in the frequency comb are shifted based on the speed of the object and demodulating the reflected frequency comb to recover a THz Doppler signature of the object.

Abstract: Systems and methods for utilizing a small form-factor, wirelessly powered transceiver are disclosed. In one embodiment, a wireless powered transceiver includes a receive antenna configured to receive a receive signal, a transmit antenna configured to transmit a transmit signal, a power harvesting system including a rectifier circuit configured convert radio frequency energy from the receive signal into DC (direct current) voltage, and a power management unit (PMU) configured to set the operating mode and biasing condition of the receive and transmit circuitry blocks and provide DC voltage from the receive circuitry block to the transmit circuitry block to maintain a minimum voltage, a receiver circuitry block configured to provide energy from the receive signal to the power harvesting system, and a transmitter circuitry block including a data modulator circuit, the data modulator circuit configured to generate the transmit signal using DC voltage received from the power management unit.

Abstract: Systems and methods for transmitting power to wirelessly powered sensors using a pipeline as a circular waveguide are disclosed. In an embodiment, a transmitter transmits electromagnetic waves to at least one wirelessly powered sensor positioned along the pipeline, wherein the pipeline is used as a waveguide to transmit the electromagnetic waves using a particular waveguide mode form of electromagnetic radiation, where the at least one wirelessly powered sensor is configured to be operated without a battery and to be powered by the electromagnetic waves emitted by the electromagnetic transmitter and senses at least one characteristic of the pipeline.

Abstract: Certain aspects of the present disclosure provide methods and apparatus for closed-loop control of a system using one or more electron paramagnetic resonance (EPR) sensors located on-site. With such EPR sensors, a change can be applied to the system, the EPR sensors can measure the effect(s) of the change, and then adjustments can be made in real-time. This feedback process may be repeated continuously to control the system.

Abstract: Wirelessly powered implantable pulse generators (IPG) are described. In an embodiment, a wirelessly powered stimulator, includes an implantable pulse generator (IPG), including: an Rx antenna that receives a radio frequency (RF) signal from an external Tx antenna; a rectifier; an energy storage capacitor CSTOR, where the RF signal coupled to the Rx antenna is rectified by the rectifier to generate VDD and charges the CSTOR; a demodulator; an output voltage regulator that generates a stable voltage to activate the demodulator; and where the demodulator outputs a stimulation that releases the energy stored in the CSTOR on an electrode based on detecting amplitude modulation in the received RF signal; and a Tx antenna that generates the RF signal that wirelessly powers the IPG and that controls timing of output stimulations of the IPG, where amplitude modulation is applied to the RF signal to control the timing of the output stimulations.

Abstract: Systems and methods for utilizing a small form-factor, wirelessly powered transceiver are disclosed. In one embodiment, a wireless powered transceiver includes a receive antenna configured to receive a receive signal, a transmit antenna configured to transmit a transmit signal, a power harvesting system including a rectifier circuit configured convert radio frequency energy from the receive signal into DC (direct current) voltage, and a power management unit (PMU) configured to set the operating mode and biasing condition of the receive and transmit circuitry blocks and provide DC voltage from the receive circuitry block to the transmit circuitry block to maintain a minimum voltage, a receiver circuitry block configured to provide energy from the receive signal to the power harvesting system, and a transmitter circuitry block including a data modulator circuit, the data modulator circuit configured to generate the transmit signal using DC voltage received from the power management unit.

Abstract: Systems and methods for modulation and demodulation using a micro-Doppler effect are described. In an embodiment, the method includes radiating, using a picosecond pulse generator with an antenna, a train of THz pulses that form a frequency comb, where the frequency comb is reflected from an object such that the frequency several tones in the frequency comb are shifted based on the speed of the object and demodulating the reflected frequency comb to recover a THz Doppler signature of the object.

Abstract: Systems and methods for remote sensing are described.

Abstract: Systems and methods in accordance with embodiments of the invention implement wirelessly powered frequency-swept spectroscopy sensors. One embodiment includes a first antenna configured to receive an incoming signal; an energy-harvesting circuit configured to produce DC energy; a power management unit; an on-chip signal source configured to use the incoming signal as a locking signal; and a second antenna configured to transmit back a signal locked to the frequency of the incoming signal. In a further embodiment, the wirelessly powered frequency-swept spectroscopy sensor includes a third antenna, where the third antenna is on-chip.

Abstract: Many embodiments provide a frequency comb receiver that includes a PIN diode, a THz pulse generator block that generates THz tones (LO) for coherent frequency comb detection, an on-chip antenna for broadband detection and a driver stage switched by a series of buffers, where a repetition rate of the LO tones are tunable over a range and determines a spacing between two adjacent tones in the corresponding frequency comb.