Abstract: An image processing system includes at least two, complementary, angle sensitive pixel (ASP) structures, having a spatial frequency domain ASP output including a background output and a plurality of ASP response outputs, in response to an optical input; an ASP response output subtractor component, which functions to suppress the background output and perform a subtraction of at least two of the ASP response outputs; and a processing component that can process the subtracted spatial frequency domain ASP response outputs. An optical domain image processing method includes the steps of providing at least two, complementary, angle sensitive pixel (ASP) structures; obtaining a spatial frequency domain ASP output including a plurality of complementary ASP response outputs, in response to an optical input; performing a wavelet-like transform of the ASP response outputs in the optical domain prior to performing any operation in a digital domain; and obtaining a desired output of the optical input.

Abstract: The present invention is directed to a wireless communications device that includes an antenna configured to receive an RF signal from an ambient environment. The antenna is characterized by an antenna impedance and the RF signal is characterized by a predetermined frequency. A passive mixer assembly is coupled to the antenna without an RF matching network. The passive mixer assembly is characterized by a passive mixer impedance presented to the antenna. The passive mixer assembly includes a plurality of baseband mixer ports. The passive mixer assembly is configured to downconvert the RF signal and provide a plurality of baseband signals. Each baseband signal of the plurality of baseband signals is directed out of a corresponding port of the plurality of baseband mixer ports and characterized by a predetermined phase of a plurality of predetermined phases. A baseband low noise amplifier (baseband-LNA) assembly is coupled to the passive mixer assembly.

Abstract: A receiver circuit includes a quadrature passive mixer, a first charge load, and a second charge load. The quadrature passive mixer has a differential input for receiving a differential input signal, and arranged for mixing the differential input signal with a quadrature local oscillator (LO) signal. The quadrature passive mixer has an in-phase mixer with a differential in-phase output, and a quadrature-phase mixer with a differential quadrature-phase output. The first and second charge loads are coupled to differential in-phase output and differential quadrature-phase output, respectively. In every quarter cycle of the quadrature LO signal, the differential in-phase output and the differential quadrature-phase output are arranged to be not shorted so as to avoid charging sharing between the first charge load and the second charge load, or are arranged to be shorted to cause charging sharing between the first charge load and the second charge load that generates a leakage path.

Abstract: An angle-sensitive pixel (ASP) device that uses the Talbot effect to detect the local intensity and incident angle of light includes two local diffraction gratings stacked above a photodiode. When illuminated by a plane wave, the upper grating generates a self-image at a selected Talbot depth. The second grating, placed at this depth, blocks or passes light depending upon incident angle. Several such structures, tuned to different incident angles, are sufficient to extract local incident angle and intensity. Arrays of such structures are sufficient to localize light sources in three dimensions without any additional optics.

Abstract: An image processing system includes at least two, complementary, angle sensitive pixel (ASP) structures, having a spatial frequency domain ASP output including a background output and a plurality of ASP response outputs, in response to an optical input; an ASP response output subtractor component, which functions to suppress the background output and perform a subtraction of at least two of the ASP response outputs; and a processing component that can process the subtracted spatial frequency domain ASP response outputs. An optical domain image processing method includes the steps of providing at least two, complementary, angle sensitive pixel (ASP) structures; obtaining a spatial frequency domain ASP output including a plurality of complementary ASP response outputs, in response to an optical input; performing a wavelet-like transform of the ASP response outputs in the optical domain prior to performing any operation in a digital domain; and obtaining a desired output of the optical input.

Abstract: An event-driven neural network includes a plurality of interconnected core circuits is provided. Each core circuit includes an electronic synapse array has multiple digital synapses interconnecting a plurality of digital electronic neurons. A synapse interconnects an axon of a pre-synaptic neuron with a dendrite of a post-synaptic neuron. A neuron integrates input spikes and generates a spike event in response to the integrated input spikes exceeding a threshold. Each core circuit also has a scheduler that receives a spike event and delivers the spike event to a selected axon in the synapse array based on a schedule for deterministic event delivery.

Abstract: The present invention is directed to a wireless communications device that includes an antenna configured to receive an RF signal from an ambient environment. The antenna is characterized by an antenna impedance and the RF signal is characterized by a predetermined frequency. A passive mixer assembly is coupled to the antenna without an RF matching network. The passive mixer assembly is characterized by a passive mixer impedance presented to the antenna. The passive mixer assembly includes a plurality of baseband mixer ports. The passive mixer assembly is configured to downconvert the RF signal and provide a plurality of baseband signals. Each baseband signal of the plurality of baseband signals is directed out of a corresponding port of the plurality of baseband mixer ports and characterized by a predetermined phase of a plurality of predetermined phases. A baseband low noise amplifier (baseband-LNA) assembly is coupled to the passive mixer assembly.

Abstract: A system for correcting a second order intermodulation product in a direct conversion receiver is provided. The system includes a cross-covariance system receiving a data signal and a second order intermodulation estimate signal and generating a cross-covariance value. An auto-covariance system receives the second order intermodulation estimate signal and generates an auto covariance value. A buffer system stores a second order intermodulation product correction factor. A divider receives the cross-covariance value, the auto-covariance value and the second order intermodulation product correction factor and generates a running average second order intermodulation product correction factor.

Abstract: A receiver circuit includes a quadrature passive mixer, a first charge load, and a second charge load. The quadrature passive mixer has a differential input for receiving a differential input signal, and arranged for mixing the differential input signal with a quadrature local oscillator (LO) signal. The quadrature passive mixer has an in-phase mixer with a differential in-phase output, and a quadrature-phase mixer with a differential quadrature-phase output. The first and second charge loads are coupled to differential in-phase output and differential quadrature-phase output, respectively. In every quarter cycle of the quadrature LO signal, the differential in-phase output and the differential quadrature-phase output are arranged to be not shorted so as to avoid charging sharing between the first charge load and the second charge load, or are arranged to be shorted to cause charging sharing between the first charge load and the second charge load that generates a leakage path.

Abstract: A receiver circuit includes an amplifier, an output impedance, and a mixer. The amplifier is arranged to generate an amplifier output. The mixer has an input and an output respectively coupled to the amplifier and the output impedance. The output impedance sets frequency selectivity provided at the input of the mixer, and the mixer is arranged to down-convert a signal derived from the amplifier output and accordingly generate a down-converted signal at the output of the mixer for further signal processing.

Abstract: An angle-sensitive pixel (ASP) device that uses the Talbot effect to detect the local intensity and incident angle of light includes a phase grating disposed above a photodiode assembly or a phase grating disposed above an analyzer grating that is disposed above a photodiode assembly. When illuminated by a plane wave, the upper grating generates a self-image at a selected Talbot depth. Several such structures, tuned to different incident angles, are sufficient to extract local incident angle and intensity. Arrays of such structures are sufficient to localize light sources in three dimensions without any additional optics.

Abstract: A system for correcting a second order intermodulation product in a direct conversion receiver is provided. The system includes a cross-covariance system receiving a data signal and a second order intermodulation estimate signal and generating a cross-covariance value. An auto-covariance system receives the second order intermodulation estimate signal and generates an auto covariance value. A buffer system stores a second order intermodulation product correction factor. A divider receives the cross-covariance value, the auto-covariance value and the second order intermodulation product correction factor and generates a running average second order intermodulation product correction factor.

Abstract: A system for correcting a second order intermodulation product in a direct conversion receiver is provided. The system includes a cross-covariance system receiving a data signal and a second order intermodulation estimate signal and generating a cross-covariance value. An auto-covariance system receives the second order intermodulation estimate signal and generates an auto covariance value. A buffer system stores a second order intermodulation product correction factor. A divider receives the cross-covariance value, the auto-covariance value and the second order intermodulation product correction factor and generates a running average second order intermodulation product correction factor.

Abstract: An angle-sensitive pixel (ASP) device that uses the Talbot effect to detect the local intensity and incident angle of light includes two local diffraction gratings stacked above a photodiode. When illuminated by a plane wave, the upper grating generates a self-image at a selected Talbot depth. The second grating, placed at this depth, blocks or passes light depending upon incident angle. Several such structures, tuned to different incident angles, are sufficient to extract local incident angle and intensity. Arrays of such structures are sufficient to localize light sources in three dimensions without any additional optics.

Abstract: A receiver circuit includes an amplifier, an output impedance, and a mixer. The amplifier is arranged to generate an amplifier output. The mixer has an input and an output respectively coupled to the amplifier and the output impedance. The output impedance sets frequency selectivity provided at the input of the mixer, and the mixer is arranged to down-convert a signal derived from the amplifier output and accordingly generate a down-converted signal at the output of the mixer for further signal processing.

Abstract: A receiver circuit comprising a quadrature passive mixer having an input and an output, and an input impedance of the quadrature passive mixer provides a band-pass response. One or more output impedances coupled to the output of the quadrature passive mixer. A low noise amplifier (LNA) having an input and an output coupled to the quadrature passive mixer, the LNA configured to provide substantially linear transconductance over a predetermined input range.

Abstract: A system for correcting a second order intermodulation product in a direct conversion receiver is provided. The system includes a cross-covariance system receiving a data signal and a second order intermodulation estimate signal and generating a cross-covariance value. An auto-covariance system receives the second order intermodulation estimate signal and generates an auto covariance value. A buffer system stores a second order intermodulation product correction factor. A divider receives the cross-covariance value, the auto-covariance value and the second order intermodulation product correction factor and generates a running average second order intermodulation product correction factor.

Abstract: A receiver circuit comprising a quadrature passive mixer having an input and an output, and an input impedance of the quadrature passive mixer provides a band-pass response. One or more output impedances coupled to the output of the quadrature passive mixer. A low noise amplifier (LNA) having an input and an output coupled to the quadrature passive mixer, the LNA configured to provide substantially linear transconductance over a predetermined input range.

Abstract: A quadrature mixer with an LO input is provided. The quadrature mixer receives a signal having a frequency FLO and a signal input having a frequency FSIG, and has an output that comprises an output impedance that is high at frequencies of |FLO?FSIG | and |FLO+FSIG| and low at other. A mixer coupled to the output impedance interacts with the output impedance such that an impedance presented at the signal input is high for signals at FSIG if FSIG is a predetermined signal frequency, and low at other frequencies.

Abstract: Systems and methods for producing a frequency divider output signal having a period substantially equal to three times a period of a reference input signal, comprising configuring each of three storage elements to receive a first input, a second input, and a reference input signal, and to provide a storage element output, obtaining a frequency divider output signal from at least one storage element output, and using the storage element output from each of the three storage elements as an input to another one of the three storage elements, where a phase difference between the output of the first storage element and the output of the second storage element is substantially equal to 60°.