Abstract: A wireless device including a receiver circuit coupled to a radio frequency receiver node, a frequency selective attenuator including an inductor and a first capacitor coupled in series to the radio frequency receiver node, and a second capacitor coupled in parallel with the first capacitor. The first capacitor has a first capacitance based on a blocker frequency and the second capacitor has a second capacitance that linearizes the frequency selective attenuator. A method of linearizing a frequency selective attenuator including detecting presence of a blocker signal, activating and programming a capacitor of the frequency selective attenuator to reduce a strength of the blocker signal, determining a frequency difference between the blocker signal and a receive frequency, and coupling a second capacitor to the frequency selective attenuator to linearize the frequency selective attenuator when the frequency difference is no more than an attenuation threshold.

Abstract: An electrical balance duplexer has multiple impedance gradients and multiple impedance tuners. The electrical balance duplexer transmits an outgoing signal from a transmitter during a transmission mode when a first set of impedance gradients of the multiple impedance gradients is operating in a first impedance state and a first set of impedance tuners of the multiple impedance tuners is operating in a second state. The electrical balance duplexer isolates the outgoing signal from a receiver during the transmission mode when a second set of impedance gradients of the multiple impedance gradients and a second set of impedance tuners of the multiple impedance tuners are operating in the second impedance state.

Abstract: An amplifying circuit and a rectifying antenna are provided. The amplifying circuit includes: a first rectifying circuit, configured to output a first direct current signal according to a first alternating current signal; a second rectifying circuit, configured to output a second direct current signal according to a second alternating current signal; a differential amplifying circuit, configured to receive the first direct current signal and the second direct current signal, amplify a difference between the first direct current signal and the second direct current signal, and output an amplified difference between the first direction current signal and the second direct current, the first direct current signal and the second direct current signal have directions opposite to each other.

Abstract: An active filter reduces Electro-Magnetic Interference (EMI) created by current flowing through a power line. The active filter connects to the power line at a single node through a connection capacitor. A sense current flows through the connection capacitor when the power line current changes. This sense current is applied to a non-inverting input of an op amp to drive a power amplifier circuit through a filter capacitor. The power amplifier circuit increases the current drive of the op amp to charge a transfer capacitor that converts the power amplifier output current to a transfer voltage. The transfer capacitor is connected to the connection capacitor so that the transfer voltage is injected back into the power line through the connection capacitor as an injected voltage that compensates for the sensed current. Op amp gain is adjustable by variable resistors that connect to the inverting input of the op amp.

Abstract: Portable communications devices with reduced interference between communication systems. One embodiment provides a portable communications device including a first antenna, a second antenna, a first transceiver configured to operate over a first range of frequencies, a second transceiver configured to operate over a second range of frequencies and a third range of frequencies. The portable communications device includes an isolator circuit coupling the first transceiver and the second transceiver to the first antenna and the second antenna. The isolator circuit is configured to provide isolation between the first transceiver and the second transceiver when the second transceiver is operating in the second range of frequencies. The portable communications device further includes a bidirectional diplexer coupling the second transceiver to the isolator circuit.

Abstract: A control device controls an inverter such that a detected value of an output current of an inverter follows a current command value. The control device is configured to calculate a current deviation between the current command value and the detected value of the output current of the inverter, and control switching of switching elements to allow the calculated current deviation to be equal to or less than a current deviation command value. The control device sets a current limiter for a load current, the current limiter being smaller than an over current level, a load current with a current limiter smaller than an overcurrent level. When the detected value of the load current is larger than the current limiter, the control device reduces the current deviation command value to be smaller than that applied when the load current is smaller than the current limiter.

Abstract: The disclosure relates to a background noise estimator and a method therein, for supporting sound activity detection in an audio signal segment. The method comprises reducing a current background noise estimate when the audio signal segment is determined to comprise music and the current background noise estimate exceeds a minimum value. This is to be performed when an energy level of an audio signal segment is more than a threshold higher than a long term minimum energy level, lt_min, which is determined over a plurality of preceding audio signal segments, or, when the energy level of the audio signal segment is less than a threshold higher than lt_min, but no pause is detected in the audio signal segment.

Abstract: The disclosure relates to a cancellation device for cancelling interference caused by a non-linear device, the cancellation device comprising: an adaptive filter coupled in parallel to the non-linear device, wherein the adaptive filter is configured to filter an input signal of the non-linear device to generate an approximation signal approximating an output signal of the non-linear device; an error signal generator configured to generate an error signal based on a function of the output signal and the approximation signal; and a controller configured to adjust the adaptive filter based on the error signal and a phase and magnitude relation of the output signal and the input signal.

Abstract: A contactless readable programmable transponder to monitor chip join and method of use are disclosed. The method includes reading a frequency of an oscillator associated with a chip module. The method further includes correlating the frequency with a bond quality of the chip module.

Abstract: A circuit includes a first transconductance stage having an output. The circuit further includes an output transconductance stage, and a first source-degenerated transistor having a first control input and first and second current terminals. The first control input is coupled to the output of the first transconductance stage. The circuit also includes a second transistor having a second control input and third and fourth current terminals. The third current terminal is coupled to the second current terminal and to the output transconductance stage.

Abstract: A radio frequency receiver is provided that comprises an antenna, an RF amplifier, at least one down conversion mixer stage and a variable notch filter. The at least one down-conversion mixer stage is arranged to act on signals provided by the RF amplifier and is tuned to a tuned frequency ft which is selected from a plurality of possible tuned frequencies corresponding to a frequency of the RF signal to be received at the antenna. The variable notch filter is arranged to act on signals passing from the antenna to the RF amplifier and has a resonance frequency fr which is selected from a plurality of possible resonance frequencies such that fr=ft in where n is a whole number between 2 and 10. The variable notch filter thereby acts to attenuate signals from the antenna at said resonance frequency.

Abstract: A device and method for controllably delaying an electrical signal includes a first signal transfer path between a signal input and a signal output. The first signal transfer path includes a first signal transfer stage with a first differential pair and a common, adjustable first quiescent current source, and a second signal transfer path between the signal input and the signal output. The second signal transfer path includes a second signal transfer stage with a second differential pair and a common, adjustable second quiescent current source. An internal delay stage is arranged between the signal input and the second signal transfer stage and has a third differential pair and a common, adjustable third quiescent current source, and signal combination stage for additively superimposing the electrical signal transferred via the first signal transfer path on to the electrical signal transferred via the second signal transfer path.

Abstract: A signal error calibrating method is disclosed herein and includes following steps: filtering an error voltage in a sensor by a low pass filter in a calibration mode; converting the offset voltage to be a digital offset signal by an analog digital signal converter; converting the digital offset signal to be an offset calibrating signal by a digital analog signal converter; transmitting the offset calibrating signal to an input end of the sensor so as to offset an error voltage at the input end of the sensor. After calibrating the error voltage, the analog digital converter in the error calibrating circuit can be used for the need of signal output and the low pass filter is turned off at the same time.

Abstract: As one example, a filter apparatus includes an input to receive an electrical input signal. The filter apparatus includes a forward path connected between the input and an output of the filter apparatus. A feedback path is connected to provide feedback to the forward path based on an output signal at the output of the filter apparatus. A filter bypass is configured to provide the input signal directly to the output and to the feedback path for an activation phase of the filter apparatus. Diagnostics may also be performed.

Abstract: A correction method and a correction circuit for a sigma-delta modulator (SDM) are provided. The SDM includes a loop filter, a quantizer, and a digital-to-analog converter (DAC). The correction method includes the following steps: controlling the DAC not to receive the output of the quantizer; controlling the SDM to stop receiving signals; inputting a test signal to the DAC; converting the output of the loop filter to a digital signal; comparing the digital signal with a preset value; and adjusting the loop filter according to the result of comparing the digital signal and the preset value.

Abstract: An amplifier device (14) is adapted for an antenna-like transducer for MRI applications, especially for an RF coil. The amplifier device (14) includes at least one amplifier channel (16) including: an input connection device (18) for connecting an RF signal source (12); an output connection device (20) for connecting the antenna-like RF transducer; an RF amplifier unit (22); and an impedance matching circuit (24) configured to adapt the coupling of the RF amplifier unit (22) to the actually connected antenna-like RF transducer with regard to an actual load of the amplifier device (14). The load results from the combination of the antenna-like RF transducer and a person or sample interacting with the antenna-like RF transducer. The impedance matching circuit (24) establishes an electric line (34) between the RF amplifier unit (22) and the antenna-like transducer with an adjustable line length.

Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) circuit. The multi-band RF circuit includes multiple antenna ports coupled to multiple antennas and an antenna swapping circuit coupled to the multiple antenna ports. Control circuitry in the multi-band RF circuit controls the antenna swapping circuit to selectively couple various transmit and/or receive filters with any one or more of the multiple antenna ports to support uplink carrier aggregation (ULCA) and/or multiple-input multiple-output (MIMO) operations with a minimum number of transmit and receive filters. Transmit filters of adjacent RF bands are physically separated, but disposed in proximity, in the multi-band RF circuit to help reduce intermodulation products between the adjacent RF bands during the ULCA operation. As a result, it is possible to improve RF performance of ULCA and MIMO operations, without increasing complexity, cost, and footprint of the multi-band RF circuit.

Abstract: Technology for a channelization device of a wideband repeater is disclosed. The channelization device can include a first diplexer and a second diplexer. The channelization device can include a plurality of switchable signal paths between the first diplexer and the second diplexer operable to perform channelized passive filtering of signals in defined bands. The channelization device can include a plurality of switchable pass through signal paths between the first diplexer and the second diplexer operable to pass through signals in the defined bands without filtering of the signals. The channelization device can be configured to perform channelized passive filtering of signals with no amplification of the signals.

Abstract: The invention relates to an optical device, comprising: a lens having an adjustable focal length. According to the invention, a light source which is configured to emit light that is affected by said lens and impinges on at least a first photosensitive element, which is designed to generate a first output signal corresponding to the intensity of light impinging on it, wherein the first photosensitive element is configured to measure only a portion of the intensity distribution of said emitted light, and wherein the light source, the lens and the first photosensitive element are configured such that a change of the focal length of said lens changes the intensity distribution of the emitted light that impinges on the first photosensitive element, so that each focal length of the lens is associated to a specific first output signal generated by the first photosensitive element.

Abstract: This disclosure relates to systems and methods for analyzing sensor data using incremental autoregression techniques for generating a vector of autoregression coefficients is provided. The system processes a time series data to obtain blocks of observation values, reads the observation values, updates pre-stored convolution values with the observation values, updates a partial sum by adding each observation value to the partial sum, increments a count each time an observation value is read, repeats the steps of updates and increments until a last observation value from a last block is read to obtain an updated set of convolution values, partial sum, and count. The system further computes a first matrix and a second matrix using the updated set of convolutions values, or summation of observation values computed from the updated partial sum, or the updated count, and generates a vector of autoregression coefficients based on the first and the second matrix.

Abstract: One embodiment is directed to a device comprising one or more processing devices comprising an input and an output. The one or more processing devices are configured to receive an input signal via the input of the one or more processing devices. The one or more processing devices are further configured to apply a transfer function of a variable filter implemented via the one or more processing devices, the transfer function applied to the received input signal in order to generate a filtered signal, wherein application of the transfer function cancels, reduces, attenuates, or eliminates intermodulation byproducts of the input signal. The one or more processing devices are further configured to output the filtered signal via the output of the one or more processing devices.

Abstract: Polyphase gm-C filters can use matching gm cell components for improved higher image rejection results. Polyphase gm-C filter cells all can be matched by incorporating a matching gmu value in each of the gm components. The matching gmu value used to replace different gm values can be determined for incorporation into each gm cell component of a filter by: calculating coupling of gmi, gmij by gmi=Ci?0 and gmij=Czij?0 for i,j; calculating Ki=gmi/gmu; rounding Ki to an integer number, Ni=round(Ki), KiNi and Nij=round(Kij), KijNij; calculating a scaling factor for circuit capacitors Ci and Czijby ?i=(Ni?Ki)/Ki and ?ij=(Nij?Kij)/Kij; and adjusting circuit capacitors Ci and Czij by CiCi*(1+?i) and CzijCzij*(1+?ij). Once the process is completed for i,j, the result can be implemented to match gm cell components of traditional and newly designed polyphase gm-C filters with the matching gmu value.

Abstract: Methods and systems for substantially simultaneously scan of two or more frequencies using one transceiver are discussed herein. For example, a listening device can include a controller configured to control its transceiver to alternate between two or more frequencies from two or more sets of frequencies. The controller is also configured to capture a portion of a preamble of a received signal to determine whether the received signal is intended for the listening device.

Abstract: A method evaluates a frequency spectrum representative of at least one time-dependent signal, the at least one time dependent signal being derived from an output from a measuring device under predetermined measuring device operating conditions. The time-dependent signal, includes a portion being representative of a wanted signal, and a portion being representative of noise. The method includes the steps of determining, based on the frequency spectrum of the signal, a value representative of the noise floor, identifying, based on the frequency spectrum of the signal derived under the predetermined operating condition, a peak component, and if the peak component satisfies a relative peak criterion determined on the basis of the determined value representative of the noise floor, determining the wanted signal by applying a predetermined algorithm. The invention further relates to a method for determining flow of a vortex measuring device, and a vortex sensor.

Abstract: A filter circuit includes a filter and a current mode programmable gain amplifier, where the filter circuit is configured to filter an input signal to obtain an output signal. The filter is supplied with the input signal. The filter comprises at least one current extraction element configured to extract a first output current signal. The current mode programmable gain amplifier is configured to receive and amplify the first output current signal to obtain an amplified current signal. The output signal is derived from the amplified current signal.

Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) front-end circuit. When a first antenna transmits an RF transmit signal in an RF transmit band, a second antenna may receive the RF transmit signal as an interference signal. The multi-band RF front-end circuit includes multiple receive filters for receiving an RF receive signal in multiple RF receive bands. A selected receive filter among the multiple receive filters is opportunistically reconfigured to help suppress the interference signal. Specifically, a bandpass bandwidth of the selected receive filter is expanded to include at least a portion of the RF spectrum of the interference signal. By doing so, it is possible to shunt the interference signal to a ground through the selected receive filter. As a result, it is possible to reduce an adverse impact of the interference signal to improve RF performance of the multi-band RF front-end circuit.

Abstract: A simulator assistance method and system adaptively mitigates Pilot Induced Oscillations (PIOs) with respect to axes of rotation about the vehicle's center of mass. The method detects PIOs in a body rate signal by band pass filtering the body rate signal, and provides an adaptive response based on the amplitude of the body rate signal within the frequency band.

Abstract: A RC oscillator comprises a resistor unit. The resistor unit can comprise at least one set of compensation resistor. Each set of compensation resistor comprises a positive temperature coefficient resistor and a negative temperature coefficient resistor coupled in series with the positive temperature coefficient resistor.

Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) circuit. The multi-band RF circuit includes multiple antenna ports coupled to multiple antennas and an antenna swapping circuit coupled to the multiple antenna ports. Control circuitry in the multi-band RF circuit controls the antenna swapping circuit to selectively couple various transmit and/or receive filters with any one or more of the multiple antenna ports to support uplink carrier aggregation (ULCA) and/or multiple-input multiple-output (MIMO) operations with a minimum number of transmit and receive filters. Transmit filters of adjacent RF bands are physically separated, but disposed in proximity, in the multi-band RF circuit to help reduce intermodulation products between the adjacent RF bands during the ULCA operation. As a result, it is possible to improve RF performance of ULCA and MIMO operations, without increasing complexity, cost, and footprint of the multi-band RF circuit.

Abstract: An electronic device and a method for filtering common mode disturbances from a power electronic device are disclosed. In an embodiment the device includes a first capacitor coupled in series to a first one-way conductor, the first one-way conductor allowing current flow in one direction, wherein the first one-way conductor and the first capacitor are coupled between a load node and a reference potential and a second capacitor coupled in series to a second one-way conductor, the second one-way conductor allowing current flow in an opposite direction, wherein the second one-way conductor and the second capacitor are coupled between the load node and the reference potential. The device further includes a third capacitor being coupled between the load node and the reference potential, a first switch bypassing the first one-way conductor and a second switch bypassing the second one-way conductor.

Abstract: A palm-size portable ?NMR relaxometer system for performing multi-step multi-sample chemical/biological assays, comprising a PCB having a CMOS ?NMR transceiver and a DMF device integrated thereon. A portable magnet has an inner gap configured to at least partially receive the DMF device. The DMF device comprises a platform of electrodes including a sensing site and receives one or more samples for analysis at an electrode and automatically transports the one or more samples on individual paths sequentially to the sensing site, for performing sensing on each sample sequentially. A Butterfly coil disposed on the PCB and underneath the DMF device and is at least partially received in the inner gap. The Butterfly coil excites the sample at the ?NMR sensing site by transducing a magnetic field produced at the sensing site to an electrical signal which is processed by the CMOS ?NMR transceiver to produce an analytical signal.

Abstract: Provided is a polyphase filter, which is capable of achieving amplitude matching and phase matching while achieving a low insertion loss with a single-stage configuration. A first variable resistor and a second variable resistor have resistance values that are equal to each other, and the resistance values are set so as to correct an amplitude error between orthogonal signals of outputs of a first output terminal to a fourth output terminal. A first variable capacitor, a second variable capacitor, a third variable capacitor, and a fourth variable capacitor have capacitance values that are equal to one another, and the capacitance values are set so as to correct a phase error between the orthogonal signals of the outputs of the first output terminal to the fourth output terminal.

Abstract: A filtering unit is presented. The filtering unit includes at least two operational amplifiers, where each of the at least two operational amplifiers includes an input end and an output end, where the input end of one operational amplifier is coupled across the corresponding input end of another operational amplifier of the at least two operational amplifiers. The filtering unit also includes a direct current link operatively coupled to the at least two operational amplifiers and at least one thermoelectric module, where each thermoelectric module includes a conducting layer, where the direct current link and at least one of the at least two operational amplifiers are operatively coupled to the at least one thermoelectric module. A filtering system is also presented.

Abstract: A system includes: a baseband phase generator configured to receive differential in-phase (I) and quadrature (Q) signals and configured to output N phase-shifted baseband signals, wherein N is greater than 4, further wherein the baseband phase generator comprises a plurality of notch filters configured to receive the I and Q signals; and an upconverter configured to receive the phase-shifted baseband signals, to perform mixing on the phase-shifted baseband signals, and to output a differential upconverted signal.

Abstract: A high order filter circuit is integrated by a plurality of the low order filter circuits. Before correcting the high order filter circuit, switch units may restore the high order filter circuit to the low order filter circuits for correction, and then combine the corrected low order filter circuits to form the original high order filter circuit.

Abstract: A method for compensating the bandedge ripple of an analog filter, using a circuit comprising a low pass filter is described. The method comprises receiving, at the analog filter, a plurality of tones of different frequencies from a tone generator, measuring, an amplitude of each tone in the plurality of tones after each tone is processed by the analog filter, storing the measured amplitudes and frequencies in a database, measuring a bandedge ripple by measuring a difference in amplitude between a first tone and a second tone from the plurality of tones, and selecting a low pass filter, from a plurality of low pass filters, based on the measured difference.

Abstract: According to one mode of the inventive concept, an amplification device includes a first amplifier configured to amplify an input multi-band signal to a first level, a separating unit configured to separate the multi-band signal having the first level into a first band signal and a second band signal, and a second amplifier configured to amplify the second band signal to a second level.

Abstract: There is described herein methods and devices for high DC gain closed loop operation amplifiers exploiting cascaded low gain stages and a controller-based compensation circuit for stability.

Abstract: The present invention provides methods and systems for digitally processing audio signals. Some embodiments receive an audio signal and converting it to a digital signal. The gain of the digital signal may be adjusted a first time, using a digital processing device located between a receiver and a driver circuit. The adjusted signal can be filtered with a first low shelf filter. The systems and methods may compress the filtered signal with a first compressor, process the signal with a graphic equalizer, and compress the processed signal with a second compressor. The gain of the compressed signal can be adjusted a second time. These may be done using the digital processing device. The signal may then be output through an amplifier and driver circuit to drive a personal audio listening device. In some embodiments, the systems and methods described herein may be part of the personal audio listening device.

Abstract: A linearized power amplifier apparatus includes a number of amplifying stages to amplify a radio-frequency (RF) signal, and a feedback loop including a feedback circuit coupled between an output port of a last amplifying stage and an input port of a first amplifying stage. The feedback loop has a loop gain frequency response that peaks at a frequency approximately equal to a frequency of the RF signal. The feedback loop can provide a linear combination of a feedback signal and the RF signal to the input port of the first amplifying stage.

Abstract: Disclosed are a pixel acquisition circuit, an image sensor, and an image acquisition system. The pixel acquisition circuit includes a photodetection unit, filter-amplification unit, sample and hold unit, and activation control unit. The photodetection unit outputs a first electrical signal corresponding to a light signal illuminating thereon. The filter-amplifier unit is connected to the photodetector, and amplifies and filters out the signal component below a frequency threshold on the first electrical signal, to output a second electrical signal. A threshold comparison unit determines whether the second electrical signal is greater than a first threshold and/or less than a second threshold and, if so, generates an activation instruction signal. In response to receiving an activation instruction signal, the activation control unit instructs the sample and hold unit to acquire and buffer the first electrical signal, and sends a transmission request to an interface bus connected to the sample and hold unit.

Abstract: The disclosure relates to a tunable filter. The tunable filter includes: a filter input; a filter output; at least one feedback loop coupled between the filter output and the filter input, where the at least one feedback loop includes at least one tunable feedback capacitance which is configured to tune a cut-off frequency of the tunable filter; and an active element, coupled between the filter input and the filter output and configured to drive the at least one tunable feedback capacitance, the active element having a transfer function with a primary pole and at least one secondary pole, where the active element includes a first stabilization element that is coupled to a first internal node of the active element.

Abstract: The present technology relates to a notch filter capable of easily obtaining a desired frequency characteristic. In an N-path filter unit, any one of a plurality of N capacitors is selected as a signal path through which a signal passes, so that the capacitor serving as the signal path is temporally switched. A plurality of N-path filter units is cascade-connected and a capacitor is inserted to a connection point between the N-path filter units. The present technology may be applied to the notch filter which eliminates a blocker and the like, for example.

Abstract: A maximum noise suppression level (Gmin) is not a single constant value for an entire frequency range, but is allowed to vary across frequencies. The amount of variation is dynamically computed based on the input noise characteristics. For example, if there is excess noise in the lower frequency region, the maximum noise suppression level in that region will increase to suppress the noise in that frequency region. This feature can be enabled all the time, and will be active when the input conditions warrant extra noise suppression in a particular frequency region. Thus, the effort involved in manually tuning an audio system (e.g., hands-free telephony, voice-controlled automotive head unit, etc.) can be significantly reduced or eliminated.

Abstract: An inductive synthesis circuit that mimics an ideal inductor over a wide range of inductance values, from less than 1 mH to more than 100 H, can be used in place of an inductor in any electrical circuit. One application of a synthesized inductor is in an integrated circuit in which it is impractical to construct a coil of wire. The inductive synthesis circuit is suitable for use in a calibration instrument for testing an inductance meter. The inductive synthesis circuit, together with a resistive synthesis circuit and a capacitive synthesis circuit, can be used to calibrate a multi-meter. Alternatively, the inductive synthesis circuit can be used to mimic an ideal inductor in a filter circuit that includes an inductor component, such as a high pass filter, a notch filter, or a band pass filter.

Abstract: For example, an averaging circuit includes first to third capacitors and a controller. The controller causes a first first-stage average voltage to be applied to a first capacitor, the first first-stage average voltage being an average of a first voltage applied to the first capacitor and a second voltage applied to a second capacitor, causes a second first-stage average voltage to be applied to the second capacitor, the second first-stage average voltage being an average of a third voltage applied to the second capacitor and a fourth voltage applied to a third capacitor, and causes a first second-stage average voltage to be applied to the first capacitor, the first second-stage average voltage being an average of the first and second first-stage average voltages applied to the first and second capacitors.

Abstract: A waveform shaping filter according to an embodiment includes at least one filter stage and a control circuit. The filter stage includes a differentiation signal generation circuit, a proportional signal generation circuit, and an adder circuit. The differentiation signal generation circuit generates a differentiation signal obtained by amplifying a differentiation component of an input signal. The proportional signal generation circuit generates a proportional signal obtained by amplifying the input signal. The adder circuit outputs an output signal obtained by adding the proportional signal and the differentiation signal. The control circuit compares the output signal and a first detection level, detects at least one of an overshoot and an undershoot of the output signal, and controls a time constant of the filter stage, based on a detection result.

Abstract: A signal output device is provided in a communication apparatus. The communication apparatus communicates with a different one of the communication apparatus using a single line. The signal output device includes a signal output unit. The signal output unit includes a first filter and a second filter. The first filter is provided by a Bessel filter. The second filter is provided by a Chebyshev filter or a Butterworth filter. The signal output unit outputs a signal which is obtained by passing a predetermined signal through the first filter and the second filter. The signal output from the signal output unit has a pass characteristic of the first filter and a pass characteristic of the second filter. A cutoff frequency of the first filter is set to be lower than a cutoff frequency of the second filter.

Abstract: An ESD-protective-function-equipped composite electronic component is provided that includes multiple Zener diodes formed from first and second semiconductor layers. Moreover, the second semiconductor layers are disposed on an insulating substrate and in the same plane. The electronic component includes electrodes extending from each of the Zener diodes and one or more thin-film circuit element connected in series between a pair of the electrodes.

Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) front-end circuit. When a first antenna transmits an RF transmit signal in an RF transmit band, a second antenna may receive the RF transmit signal as an interference signal. The multi-band RF front-end circuit includes multiple receive filters for receiving an RF receive signal in multiple RF receive bands. A selected receive filter among the multiple receive filters is opportunistically reconfigured to help suppress the interference signal. Specifically, a bandpass bandwidth of the selected receive filter is expanded to include at least a portion of the RF spectrum of the interference signal. By doing so, it is possible to shunt the interference signal to a ground through the selected receive filter. As a result, it is possible to reduce an adverse impact of the interference signal to improve RF performance of the multi-band RF front-end circuit.