Abstract: Systems, methods, and articles of manufacture, including computer program products, are provided for capacitive passive mixer baseband receivers with broadband harmonic rejection. In some embodiments, an apparatus is provided. The apparatus includes a receiver configured to receive an input signal and generate, based on the input signal, an in-phase portion and a quadrature phase portion. The apparatus further includes a harmonic rejection mixer comprising a plurality of capacitors, the plurality of capacitors encoded with a plurality of capacitance values, the harmonic rejection mixer configured to reduce harmonics in the input signal based on applying a quantity of the plurality of capacitance values to the input signal. The apparatus further includes a plurality of switches configured to activate the plurality of capacitors, the quantity of the plurality of predetermined capacitance values applied to the input signal based on a quantity of the plurality of capacitors that are active.

Abstract: Systems, methods, and articles of manufacture, including computer program products, are provided for capacitive passive mixer baseband receivers with broadband harmonic rejection. In some embodiments, an apparatus is provided. The apparatus includes a receiver configured to receive an input signal and generate, based on the input signal, an in-phase portion and a quadrature phase portion. The apparatus further includes a harmonic rejection mixer comprising a plurality of capacitors, the plurality of capacitors encoded with a plurality of capacitance values, the harmonic rejection mixer configured to reduce harmonics in the input signal based on applying a quantity of the plurality of capacitance values to the input signal. The apparatus further includes a plurality of switches configured to activate the plurality of capacitors, the quantity of the plurality of predetermined capacitance values applied to the input signal based on a quantity of the plurality of capacitors that are active.

Abstract: In an embodiment, a single-ended transmission line N-path filter includes one or more filter stages, each stage having a first series inductive element, a shunt N-path filter, and a second series inductive element; an input port; and an output port.

Abstract: Sub-carrier selection methods and receiver architectures for receiving an Orthogonal Frequency Division Multiplexing band sensed by a plurality of antennas (101-10N). Filtering is applied to separately pass portions of the predetermined Orthogonal Division Multiplexing frequency band. Each separate portion encompasses one or more sub-bands of the predetermined Orthogonal Division Multiplexing frequency band. For each of the separate portions of the predetermined Orthogonal Division Multiplexing frequency band, the signal received from one of the plurality of antennas is selected. The selected signals for each separate portion are then combined in the time (analog) domain.

Abstract: An integrated variable voltage diode capacitor topology applied to a circuit providing a variable voltage load for controlling variable capacitance. The topology includes a first pair of anti-series varactor diodes, wherein the diode power-law exponent n for the first pair of anti-series varactor diodes in the circuit is equal or greater than 0.5, and the first pair of anti-series varactor diodes have an unequal size ratio that is set to control third-order distortion. The topology also includes a center tap between the first pair anti-series varactor diodes for application of the variable voltage load. In preferred embodiments, a second pair of anti-series varactor diodes is arranged anti-parallel to the first pair of anti-series varactor diodes so the combination of the first pair of anti-series varactor diodes and the second pair of anti-series varactor diodes control second-order distortion as well.

Abstract: The invention provides methods and devices for estimating power amplifier nonlinearity using simple correlation techniques. Methods and devices of the invention can monitor a power amplifier that has digitally modulated inputs and an output containing more than one signal stream. A preferred method of the invention creates a test signal by forming the products of several pseudorandom noise sequences from the digitally modulated inputs to the power amplifier. Nonlinear contributions of the power amplifier output are determined by cross-correlating the test signal and the total output signal of the power amplifier. In preferred embodiments, the determined nonlinear contributions of the power amplifier are used to introduce corrective predistortion in the power amplifier.

Abstract: An integrated variable voltage diode capacitor topology applied to a circuit providing a variable voltage load for controlling variable capacitance. The topology includes a first pair of anti-series varactor diodes, wherein the diode power-law exponent n for the first pair of anti-series varactor diodes in the circuit is equal or greater than 0.5, and the first pair of anti-series varactor diodes have an unequal size ratio that is set to control third-order distortion. The topology also includes a center tap between the first pair anti-series varactor diodes for application of the variable voltage load. In preferred embodiments, a second pair of anti-series varactor diodes is arranged anti-parallel to the first pair of anti-series varactor diodes so the combination of the first pair of anti-series varactor diodes and the second pair of anti-series varactor diodes control second-order distortion as well.

Abstract: Sub-carrier selection methods and receiver architectures for receiving an Orthogonal Frequency Division Multiplexing band sensed by a plurality of antennas (101-10N). Filtering is applied to separately pass portions of the predetermined Orthogonal Division Multiplexing frequency band. Each separate portion encompasses one or more sub-bands of the predetermined Orthogonal Division Multiplexing frequency band. For each of the separate portions of the predetermined Orthogonal Division Multiplexing frequency band, the signal received from one of the plurality of antennas is selected. The selected signals for each separate portion are then combined in the time (analog) domain.

Abstract: A color wheel comprises a plurality of light filters mounted on a hub or other mounting surface for rotation. The outer circumferential edge of the filters extend radially beyond the outer circumferential edge of the mounting surface. The mounting surface is beveled at its outer circumferential edge. The filters are mounted by adhesive between each filter and the mounting surface. The adhesive extends into at least a portion of the area between the bevel and the filters. Color wheel assemblies comprise such color wheels mounted to a rotational motor. The outer circumferential edges of the filters are aligned with each other to the same radial distance from the central rotational axis. In certain exemplary embodiments the filters are wedge shaped, having contact with adjacent filters only at their radially outer periphery.

Abstract: A switch comprising a substrate, an elongated movable part, a pair of electrical contacts disposed at one side of said part, an actuation electrode disposed at the one side of the part and separated from the pair of electrical contacts, wherein the part, the contacts and the electrode are disposed on the substrate, wherein the elongated movable part is arranged and dimensioned such that the part is movable in a generally lateral direction toward the contacts; the movable part includes a central elongated member fixed to a head having an electrical contact disposed at the one side. One end of the movable part is attached to the substrate by means of various anchoring arrangements.

Abstract: A precision timing generator includes a combiner that provides a timing signal by combining a coarse timing signal and a fine timing signal derived from a phase-shifted sinusoidal signal that has a desired phase shift. The coarse timing generator generates the coarse timing signal from a clock signal and a timing command input. The fine timing generator includes a sinusoidal-signal generator that receives the clock signal and generates a sinusoidal signal. The fine timing generator also includes a phase shifter that receives the sinusoidal signal and the timing command input and shifts the phase of the sinusoidal signal based on the timing input to generate the phase shifted sinusoidal signal.

Abstract: A baseband signal converter device for an impulse radio receiver combines multiple converter circuits and an RF amplifier in a single integrated circuit package. Each converter circuit includes an integrator circuit that integrates a portion of each RF pulse during a sampling period triggered by a timing pulse generator. The integrator capacitor is isolated by a pair of Schottky diodes connected to a pair of load resistors. A current equalizer circuit equalizes the current flowing through the load resistors when the integrator is not sampling. Current steering logic transfers load current between the diodes and a constant bias circuit depending on whether a sampling pulse is present.

Abstract: A switch comprising a substrate, an elongated movable part, a pair of electrical contacts disposed at one side of said part, an actuation electrode disposed at the one side of the part and separated from the pair of electrical contacts, wherein the part, the contacts and the electrode are disposed on the substrate, wherein the elongated movable part is arranged and dimensioned such that the part is movable in a generally lateral direction toward the contacts; the movable part includes a central elongated member fixed to a head having an electrical contact disposed at the one side. One end of the movable part is attached to the substrate by means of various anchoring arrangements.

Abstract: In a multiple stage transmitter, and analog signal is modulated and mixed to produce a radio frequency output. A separate mixing frequency signal is provided to each stage. A single frequency synthesizer is used rather than a plurality of frequency synthesizers. In a two-stage system, first and second dividers each receive the output of the frequency synthesizer and deliver a mixing signal to the first and second stages respectively. The modulus of each divider may be selected to minimize spurious signals.

Abstract: A frame reference signal is produced as a function of a clock signal. A first timing generator generates a coarse timing signal having a nominal period and a transition occurring at a precise temporal position with respect to the nominal period. The nominal period is a function of the frame reference signal. The temporal position is a function of a first input timing command and the clock signal. A second timing generator generates at least one fine timing transition as a function of a second input timing command and the clock signal. A combiner circuit uses the coarse timing signal to select one of the at least one fine timing transitions to output a precise timing signal, wherein the precise timing signal has a high temporal precision with respect to the frame reference signal.

Abstract: A precision timing generator includes a combiner that provides a timing signal by combining a coarse timing signal and a fine timing signal derived from a phase-shifted sinusoidal signal that has a desired phase shift. The coarse timing generator generates the coarse timing signal from a clock signal and a timing command input. The fine timing generator includes a sinusoidal-signal generator that receives the clock signal and generates a sinusoidal signal. The fine timing generator also includes a phase shifter that receives the sinusoidal signal and the timing command input and shifts the phase of the sinusoidal signal based on the timing input to generate the phase shifted sinusoidal signal.

Abstract: A switch comprising a substrate, an elongated movable part, a pair of electrical contacts disposed at one side of said part, an actuation electrode disposed at the one side of the part and separated from the pair of electrical contacts, wherein the part, the contacts and the electrode are disposed on the substrate, wherein the elongated movable part is arranged and dimensioned such that the part is movable in a generally lateral direction toward the contacts; the movable part includes a central elongated member fixed to a head having an electrical contact disposed at the one side. One end of the movable part is attached to the substrate by means of various anchoring arrangements.

Abstract: A precision timing generator includes a combiner that provides a timing signal by combining a coarse timing signal and a fine timing signal derived from a phase-shifted sinusoidal signal that has a desired phase shift. The coarse timing generator generates the coarse timing signal from a clock signal and a timing command input. The fine timing generator includes a sinusoidal-signal generator that receives the clock signal and generates a sinusoidal signal. The fine timing generator also includes a phase shifter that receives the sinusoidal signal and the timing command input and shifts the phase of the sinusoidal signal based on the timing input to generate the phase shifted sinusoidal signal.

Abstract: In a multiple stage transmitter, and analog signal is modulated and mixed to produce a radio frequency output. A separate mixing frequency signal is provided to each stage. A single frequency synthesizer is used rather than a plurality of frequency synthesizers. In a two-stage system, first and second dividers each receive the output of the frequency synthesizer and deliver a mixing signal to the first and second stages respectively. The modulus of each divider may be selected to minimize spurious signals.

Abstract: A baseband signal converter device for an impulse radio receiver combines multiple converter circuits and an RF amplifier in a single integrated circuit package. Each converter circuit includes an integrator circuit that integrates a portion of each RF pulse during a sampling period triggered by a timing pulse generator. The integrator capacitor is isolated by a pair of Schottky diodes connected to a pair of load resistors. A current equalizer circuit equalizes the current flowing through the load resistors when the integrator is not sampling. Current steering logic transfers load current between the diodes and a constant bias circuit depending on whether a sampling pulse is present.