Abstract: An analog to digital conversion (ADC) circuit includes a voltage-controlled oscillator (VCO)-based quantizer that receives a voltage input signal to be quantized and provides a digital output. A predictor samples the digital output, evaluates correlation between successive samples, and predicts a predicted input sample from the correlation to minimize voltage-to-frequency transfer of the VCO. A feedback loop L1 with a digital to analog converter (DAC) receives the predicted input sample, converts it and subtracts it from the voltage input signal. A feedback loop L2 adds the predicted sample to the digital output.

Abstract: termination circuits for backscatter communication in an integrated wake-up receiver tag device. A reflective termination circuit includes a first branch having an open load and a shorted load with first branch offset reflection coefficients and with a connection to an antenna. A second branch has a capacitive load and an inductive load with second branch offset reflection coefficients and with a connection to an antenna. A MIMO termination circuit includes plurality of transmission lines each providing a unique delay that is offset compared to other ones of the plurality of transmission lines. Switched connections to a corresponding array of antennas introduce a delay between a received and backscattered signal at each antenna in the array of antennas.

Abstract: An apparatus for wireless power transfer is described. In some implementations, the apparatus includes a resonant circuit configured to receive a radio frequency input and generate an in-phase voltage and an out-of-phase voltage. The apparatus further includes a pulse generation circuit configured to at least gate the in-phase voltage to provide a first output voltage, and gate the out-of-phase voltage to provide a second output voltage. The apparatus further includes a pulse width modulation circuit configured to provide, to the pulse generating circuit, information for controlling the pulse width modulation setting. The apparatus further includes a pulse frequency modulation circuit configured to provide, to the pulse generating circuit, information for controlling the pulse frequency modulation setting, the information for controlling the pulse frequency modulation setting determined based on the pulse width modulation setting. Related systems, methods, and articles of manufacture are also described.

Abstract: In one respect, there is provided an apparatus for neural stimulation. The apparatus may include an antenna, a plurality of electrodes, and a voltage supply generator. The antenna may be configured to receive, from an external source, radio frequency energy. The voltage supply generator configured to generate a voltage supply by at least ramping up a voltage of the radio frequency energy in successive increments, wherein the voltage supply drives a current to the plurality of electrodes during neural stimulation. Related methods and computer program products are also disclosed.

Abstract: A circuit topology including stacked power amplifiers (e.g., class D PA cells) in a ladder arranged in a house-of-cards topology such that the number of stacked-domains follows a decaying triangular series N, N?1, N?2, . . . , N?i from a fixed ladder to an ith ladder to provide a 1:(i+1) voltage conversion ratio, each stacked domain outputs its power via a flying domain power amplifier cell, and each ladder balances stacked domains of a prior ladder and combines power from all prior ladders.

Abstract: An apparatus for wireless power transfer is described. In some implementations, the apparatus includes a resonant circuit configured to receive a radio frequency input and generate an in-phase voltage and an out-of-phase voltage. The apparatus further includes a pulse generation circuit configured to at least gate the in-phase voltage to provide a first output voltage, and gate the out-of-phase voltage to provide a second output voltage. The apparatus further includes a pulse width modulation circuit configured to provide, to the pulse generating circuit, information for controlling the pulse width modulation setting. The apparatus further includes a pulse frequency modulation circuit configured to provide, to the pulse generating circuit, information for controlling the pulse frequency modulation setting, the information for controlling the pulse frequency modulation setting determined based on the pulse width modulation setting. Related systems, methods, and articles of manufacture are also described.

Abstract: In one respect, there is provided an apparatus for neural stimulation. The apparatus may include an antenna, a plurality of electrodes, and a voltage supply generator. The antenna may be configured to receive, from an external source, radio frequency energy. The voltage supply generator configured to generate a voltage supply by at least ramping up a voltage of the radio frequency energy in successive increments, wherein the voltage supply drives a current to the plurality of electrodes during neural stimulation. Related methods and computer program products are also disclosed.

Abstract: A circuit topology including stacked power amplifiers (e.g., class D PA cells) in a ladder arranged in a house-of-cards topology such that the number of stacked-domains follows a decaying triangular series N, N?1, N?2, . . . , N?i from a fixed ladder to an ith ladder to provide a 1:(i+1) voltage conversion ratio, each stacked domain outputs its power via a flying domain power amplifier cell, and each ladder balances stacked domains of a prior ladder and combines power from all prior ladders.

Abstract: An apparatus for wirelessly charging an energy storage element is disclosed. The apparatus includes a coil, a set of capacitors, a set of switches and a rectifier. The coil, which has multiple taps, is capable of being energized by a charger via inductive coupling. The capacitors are connected to the coil at various taps. The switches selectively connect the rectifier to at least one of the capacitors to charge the energy storage element that is connected to the rectifier.

Abstract: An apparatus for wirelessly charging an energy storage element is disclosed. The apparatus includes a coil, a set of capacitors, a set of switches and a rectifier. The coil, which has multiple taps, is capable of being energized by a charger via inductive coupling. The capacitors are connected to the coil at various taps. The switches selectively connect the rectifier to at least one of the capacitors to charge the energy storage element that is connected to the rectifier.