Abstract: Methods and systems for simultaneous sub-Nyquist measurement of a plurality of bioelectric signals are disclosed. A system includes measurement and reference electrodes configured to measure a first and a second bioelectric signal simultaneously. The first signal is within a first frequency band, the second signal is within a second frequency band, the second band is higher than the first band, and the first and second bands are separated by a frequency gap. The system also includes a filter for attenuating in the frequency gap and a sampler configured to sample, by conducting a sampling at a sampling frequency, the first and second bioelectric signals as measured simultaneously by the measurement and reference electrodes. The sampling frequency is lower than the Nyquist frequency for the second signal. An alias of the second signal caused by the sampling is in the frequency gap. The alias does not overlap the first band.

Abstract: An apparatus which includes a multiphase signal generator circuit. The multiphase signal generator circuit is configured to receive as input a complementary analog signal having a fundamental frequency, and generate a plurality of output complementary analog signals. Each output complementary analog signal comprises the same fundamental frequency as the input complementary analog signal, and wherein each output complementary analog signal comprises a different phase.

Abstract: In accordance with an embodiment, an RF system includes a transmit path having a first tunable transmit band stop filter, and a power amplifier coupled to an output of the first tunable transmit band stop filter, where the first tunable transmit band stop filter is configured reject a receive frequency and pass a transmit frequency; a receive path comprising an LNA; and a duplex filter having a transmit path port coupled to an output of the power amplifier, a receive path port coupled to an input of the LNA, and an antenna port, where the duplex filter is configured to pass the transmit frequency and reject the receive frequency between the antenna port and the transmit path port, pass the receive frequency and reject the transmit frequency between the antenna port and the receive path port.

Abstract: A frequency doubler is provided that filters an input signal to form I and Q components responsive to a tuning signal. A single sideband mixer mixes the I and Q components with I and Q components of a local oscillator signal to form an output signal having a frequency of twice the frequency of the input signal.

Abstract: The invention inter alia relates to a balanced frequency doubler comprising a first frequency doubler unit providing a first input port and a second input port, a second frequency doubler unit providing a third input port and a fourth input port, wherein the first, second, third and fourth input port are configured to receive a first, second, third and fourth input signal, respectively, wherein the first, second, third and fourth input signals all have the same first harmonic frequency, but are phase-shifted relative to one another, wherein a first current, the frequency spectrum of which comprises a second harmonic frequency that is double the first harmonic frequency, is driven through the first frequency doubler unit in response to the first and second input signal, wherein a second current, the frequency spectrum of which also comprises the second harmonic frequency, is driven through the second frequency doubler unit in response to the third and fourth input signals, and wherein a balanced output signal

Abstract: The invention relates to a portable radio frequency (RF) receiver module, the portable RF receiver module comprising: a standardized interface for receiving a RF signal, which comprises a RF connector and which is configured to allow as well an electrical connection and a mechanical quick attachment of the portable RF receiver module to a corresponding standardized interface of an antenna; a preselector circuit which is coupled to the standardized interface for receiving RF signals and which comprises a filter and a selection apparatus, wherein the selection apparatus is configured to allow a selection of a predefined filter characteristic of the filter and to filter out predefined frequency bands of the received RF signals. The invention further relates to a portable antenna arrangement.

Abstract: A circuit includes a first TSCP (tri-state charge pump) configured to receive a first phase and a third phase of a six-phase signal; a second TSCP configured to receive a second phase and a fourth phase of the six-phase signal; a third TSCP configured to receive a third phase and a fifth phase of the six-phase signal; a fourth TSCP configured to receive a fourth phase and a sixth phase, a fifth TSCP configured to receive the fifth phase and the first phase, and a sixth TSCP configured to receive the sixth phase and the second phase of the six-phase signal. The first, third, and fifth TSCPs output currents to a first output node and the second, fourth, and sixth TSCPs output currents to a second output node. A load is placed across the first output node and the second output node.

Abstract: A wireless device and an associated wireless device are proposed. The wireless device includes a first receiving circuit, a second receiving circuit and a detector. The first receiving circuit is arranged to receive signals in a first band. The second receiving circuit is arranged to selectively receive signals in the first band or signal reception in a second band according to a first control signal, wherein the second band is different from the first band. The detector is arranged to detect existence of a transmission signal in the second band to set the first control signal.

Abstract: A system and method for low-power digital signal processing, for example, comprising adjusting a digital representation of an input signal.

Abstract: A first high frequency processing unit detects a first broadcasting wave transmitted using a first frequency band, and extracts a first high frequency signal. Further, a second high frequency processing unit detects a second broadcasting wave transmitted using a second frequency band different from the first frequency band, and extracts a second high frequency signal. Furthermore, at least one local oscillator generates a local oscillation signal used in the first high frequency processing unit and the second high frequency processing unit.

Abstract: A receiver circuit includes a first mixer that performs frequency conversion on a first signal containing a first frequency entered from outside to output the resulting frequency-converted first signal, and a first selector that selects one out of an output signal of the first mixer and a second signal containing a second frequency entered from outside. A filter removes a pre-set frequency band of the signal selected by the first selector, and a second selector selects between outputting the signal removed of the frequency band to outside and outputting the signal to a subsequent side circuit. A second mixer performs frequency conversion of the signal output from the second selector to output the resulting frequency-converted signal. The second mixer is the subsequent side circuit. The second frequency has a carrier frequency of a radio signal.

Abstract: A tunable plasmonic crystal comprises several periods in a two-dimensional electron or hole gas plasmonic medium that is both extremely subwavelength (˜?/100) and tunable through the application of voltages to metal electrodes. Tuning of the plasmonic crystal band edges can be realized in materials such as semiconductors and graphene to actively control the plasmonic crystal dispersion in the terahertz and infrared spectral regions. The tunable plasmonic crystal provides a useful degree of freedom for applications in slow light devices, voltage-tunable waveguides, filters, ultra-sensitive direct and heterodyne THz detectors, and THz oscillators.

Abstract: One or more circuits may comprise at least one first-type analog-to-digital converter (ADC) and at least one second-type ADC. The circuit(s) may be operable to receive a plurality of signals, each of which may comprise a plurality of channels. The circuit(s) may be operable to digitize a selected one or more of the channels. Which, if any, of the selected channels are digitized via the at least one first-type ADC and which, if any, of the selected channels are digitized via the at least one second-type ADC, may be based on which of the plurality of channels are the selected channels and/or based on power consumption of the circuit(s). A bandwidth of each first-type ADC may be on the order of the bandwidth of one of the received signals. A bandwidth of each second-type ADC may be on the order of the bandwidth of one of the plurality of channels.

Abstract: A single hybrid receiver is provided for processing both single carrier and carrier aggregated (CA) communications signals where carriers are split into independent receive paths without any additional external components. The receiver receives all contiguous and non-contiguous intra-band CA and inter-band CA signals allowing for improved rejection and balanced rejection of jamming signals on either side of the two carrier signals.

Abstract: A receiver compensation method comprising receiving a radio frequency signal, amplifying the radio frequency signal, thereby producing an amplified signal, compensating the amplified signal, thereby producing a compensated signal, and mixing the compensated signal, thereby producing a mixed compensated signal, wherein the mixed compensated signal has a first gain difference between a positive differential from a center frequency and a negative differential from the center frequency and wherein the first gain differential is smaller than a second gain differential that would be obtained by mixing the amplified signal without compensating the amplified signal.

Abstract: One or more circuits may comprise at least one first-type analog-to-digital converter (ADC) and at least one second-type ADC. The circuit(s) may be operable to receive a plurality of signals, each of which may comprise a plurality of channels. The circuit(s) may be operable to digitize a selected one or more of the channels. Which, if any, of the selected channels are digitized via the at least one first-type ADC and which, if any, of the selected channels are digitized via the at least one second-type ADC, may be based on which of the plurality of channels are the selected channels and/or based on power consumption of the circuit(s). A bandwidth of each first-type ADC may be on the order of the bandwidth of one of the received signals. A bandwidth of each second-type ADC may be on the order of the bandwidth of one of the plurality of channels.

Abstract: A conversion circuit (20) for converting a complex analog input signal having an in-phase, I, component and a quadrature-phase, Q, component resulting from frequency down conversion of a radio-frequency, RF, signal (XRF) to a frequency band covering 0 Hz into a digital representation is disclosed. It comprises a channel-selection filter unit (40) arranged to filter the complex analog input signal, thereby generating a channel-filtered I and Q components, and one or more processing units (53, 53a-b). Each processing unit comprises four mixers (60-75) for generating a first and a second frequency-translated I component and a first and a second channel-filtered Q component based on two LO signals with equal LO frequency and a 90° mutual phase shift. Furthermore, each processing unit comprises a combiner unit (85, 120) for generating a first, a second, a third, and a fourth combined signal proportional to sums and differences between said frequency translated I and Q components.

Abstract: Frequency multipliers having corresponding methods and multifunction radios comprise: N multipliers, wherein N is an integer greater than one; wherein the multipliers are connected in series such that each of the multipliers, except for a first one of the multipliers, is configured to mix a periodic input signal with an output of another respective one of the multipliers; wherein the first one of the multipliers is configured to mix the periodic input signal with the periodic input signal.

Abstract: One or more circuits may comprise at least one first-type analog-to-digital converter (ADC) and at least one second-type ADC. The circuit(s) may be operable to receive a plurality of signals, each of which may comprise a plurality of channels. The circuit(s) may be operable to digitize a selected one or more of the channels. Which, if any, of the selected channels are digitized via the at least one first-type ADC and which, if any, of the selected channels are digitized via the at least one second-type ADC, may be based on which of the plurality of channels are the selected channels and/or based on power consumption of the circuit(s). A bandwidth of each first-type ADC may be on the order of the bandwidth of one of the received signals. A bandwidth of each second-type ADC may be on the order of the bandwidth of one of the plurality of channels.

Abstract: An image display apparatus having a function of charging an external device and a charging method thereof are provide. The image display apparatus includes a universal serial bus (USB) interface which is connected to an external device through a power supply line and a data transmission line, and a main controller which, if the external device is connected, activates one of the power supply line and the data transmission line according to a type of the external device. Accordingly, the image display apparatus controls a USB terminal to selectively perform a charging operation or a data transmission operation.

Abstract: A voltage sampling RF receiver in which an impedance control circuit controls the input impedance, by using a mixer stage which generates a feedback voltage, which is coupled to the RF input by a feedback resistor. A biasing arrangement can be used to adjust the feedback path so that local oscillator leakage signals are suppressed.

Abstract: The teachings presented herein allow the same sequence of local oscillator waveform sample values to be used for driving two harmonic rejection mixers for which quadrature operation is desired, irrespective of whether the oversampling rate of the sequence is divisible by four or only divisible by two. This ability is obtained by controlling whether the quadrature mixer clocks coincidentally with the in-phase mixer, or clocks a half clock cycle out of phase relative to the in-phase mixer. Several advantages attend the contemplated circuit arrangement and method of operation. Example advantages include the improved matching that comes from operating both mixers with the identical waveform sample values, and the improved flexibility in optimizing the harmonic rejection and/or interference-related operation of the mixers over a broader range of frequencies of interest, which flows from having a larger set of usable OSRs.

Abstract: A frequency mixing apparatus includes a local oscillator, a signal distributor, a first frequency mixer and a second frequency mixer and a combiner. The signal distributor divides a signal generated from the local oscillator into two signals having a phase difference and outputs the two signals. The first frequency mixer has a first input port through which one of the two signals outputted through the signal distributor is inputted and a second input port connected to an RF signal. The a second frequency mixer has a first input port through which one of the two signals outputted through the signal distributor and a second input port is connected to a termination signal. The combiner combines signals respectively outputted from the first and second frequency mixers.

Abstract: According to one aspect, a mixed-signal tuner for analog and digital TV reception incorporates a demodulator for analog TV, employing various features for resolving limitations of the analog circuitry and for achieving compatibility with various global TV standards. Such features, which may be present in one or more embodiments, include the use of a variable sample rate in all digital clocks for frequency planning, and use of a microcontroller (MCU) to control various circuitry of the tuner.

Abstract: The method and apparatus described herein address problems associated with conventional wireless receivers configured for intra-band carrier aggregation. The disclosed solution applies the received signal to a single front-end amplifier, which may comprise a low-noise amplifier, and divides the amplified signal into two or more processing paths, where each path is associated with a different local oscillator frequency corresponding to a different reception band. To compensate for the impact of the additional processing paths on the amplifier performance, a negative resistor unit applies a negative resistance to the output of the front-end amplifier when two or more processing paths are active.

Abstract: A tuner system for receiving a plurality of frequency bands includes a low noise amplifier coupled with a band selection filter to select a desired band. The tuner system further includes a complex RF filter to produce a complex RF signal from the selected band. The tuner system includes two double-quadrature converters, the first double-quadrature converter frequency down-converts the complex RF signal to a complex baseband signal. The complex baseband signal passes through a baseband filter that contains two identical lowpass filters for obtaining a baseband in-phase (I) signal and a quadrature (Q) signal. The second double-quadrature converter up-converts the baseband I and Q signals to respective IF I and Q signals that are significantly free of the positive third IF harmonic. The third IF-harmonic free I and Q signals are further processed by a complex bandpass filter. The bandpass filter has a programmable frequency center and a programmable bandwidth.

Abstract: The present invention is a hybrid RF-digital signal processor-based filter for multiband radio architectures, systems capable of spectrum re-farming and software defined radios It performs low-loss frequency agile multiple notch filtering at RF where a large dynamic range exists at a filter input between signals in a stopband and passband It is a frequency dependent signal attenuation apparatus having two paths connected together by directional couplers The first path comprising a component such as a delay component or duplexer The second path comprising, in series, a down converter, a digital filter, an up converter, and a bandstop filter At the output of a power amplifier, the invention can be used to attenuate spurs, or noise within bands with strict emission constraints At the input of a low noise amplifier, the invention can be used to attenuate blockers and transmitter noise outside of the receiver passband.

Abstract: A down-conversion module for a heterodyne receiver comprises a first mixer circuit, a second mixer circuit and an interconnection. The first mixer circuit includes first and second differential control terminals and is arranged to produce a first down-converted differential voltage signal at a first down-converted frequency as a function of a first RF differential input signal applied to the first differential control terminals and of a first RF differential reference frequency signal applied to the second differential control terminals.

Abstract: A system includes a weighting module, a mixer module, and a frequency selective impedance (FSI). The weighting module is configured to receive an input signal having an amplitude and to generate weighted outputs. Amplitudes of the weighted outputs have ratios relative to the amplitude of the input signal. The mixer module has switches configured to receive the weighted outputs and to generate a staircase waveform when the switches are clocked by clock signals. Amplitudes of steps of the staircase waveform are based on the ratios. The FSI is configured to communicate with the switches. The switches are configured to translate an impedance of the FSI centered on a first frequency to a second frequency determined by a frequency of the clock signals.

Abstract: A MMIC (microwave monolithic integrated circuit) based FET mixer and method for the same is provided. In particular, adjacent transistors, such as FETs (field effect transistors) share terminals reducing physical layout separation and interconnections. A smaller die size is realized with the improved system geometry herein provided.

Abstract: A multimeter includes a main body, two probes extending from the main body, a battery unit arranged in the main body, and a charging system arranged in the main body and configured for charging the battery. The charging system includes a microcontroller with an external input voltage sampling circuit, a battery voltage sampling circuit and a voltage regulator circuit each electrically connected the microcontroller. The microcontroller compares sampled signals from the external input voltage sampling circuit and the battery voltage sampling circuit, and controls the voltage regulator circuit to regulate the external input voltage to be applicable to the battery based on the comparison.

Abstract: The present invention is a hybrid RF-digital signal processor-based filter for multiband radio architectures systems capable of spectrum re-farming and software defined radios. It performs low-loss frequency agile multiple notch filtering at RF where a large dynamic range exists at a filter input between signals in a stopband and passband. It is a frequency dependent signal attenuation apparatus having two paths connected together by directional couplers. The first path comprising a component such as a delay component or duplexer. The second path comprising a bandstop filter connected to a down converter, a digital filter, and an up converter. At the output of a power amplifier, the invention can be used to attenuate spurs, or noise within bands with strict emission constraints. At the input of a low noise amplifier, the invention can be used to attenuate blockers and transmitter noise outside of the receiver passband.

Abstract: A radio frequency front end for a television band receiver and spectrum sensor includes a first plurality of adaptive matching networks connected to a signal summer that combines signals received by the first plurality of antennas respectively connected to the first plurality of adaptive matching networks and outputs a combined signal to each of a second plurality of downconverter/tuners. The downconverter/tuners are respectively or collectively connected to an analog to digital converter that converts output of the second plurality of downconverter/tuners into at least one digital signal that is output to the television band receiver and spectrum sensor.

Abstract: Techniques for detecting and mitigating interference are described. A device (e.g., a cellular phone) senses interference levels and digitally reconstructs the expected interference in the received signal. The device may correlate the reconstructed interference with the received signal and determine interference in the received signal based on correlation results. The device may adjust the operation of one or more circuit blocks (e.g., a mixer, an LNA, etc.) in a receiver based on the detected interference in the received signal. Alternatively or additionally, the device may condition the digital interference to obtain conditioned reconstructed interference matching the interference in the received signal and may then subtract the conditioned interference from the received signal.

Abstract: A radio system including a selected number inputs for substantially simultaneously receiving radio signals in different frequency bands and a selected number of conversion paths for converting the radio signals received at corresponding ones of the inputs into a corresponding number of digital streams. Digital processing circuitry substantially simultaneously processes digital samples for plurality of channels, the samples taken from at least one of the digital streams, wherein a maximum number of channels is greater than a maximum number of digital streams provided by the conversion paths.

Abstract: The present invention relates to a mixer circuit and method of frequency transformation, wherein an input signal is switched in accordance with a first local oscillator signal and in accordance with at least one second local oscillator signal having a smaller duty cycle than said first local oscillator signal, or having a respective predetermined phase shift with respect to said first local oscillator signal. Output signals obtained by the switching in accordance with the first and at least one second local oscillator signals are summed and the polarity of one of said first local oscillator signal and said at least one second local oscillator signal is switched in response to a control input, to thereby switch between a harmonic-rejection mode and a sub-harmonic mixing mode.

Abstract: Embodiments of a SAW-less RF receiver front-end that includes a frequency translated notch filter (FTNF) are presented. An FTNF includes a passive mixer and a baseband impedance. The baseband impedance includes capacitors that form a low-Q band-stop filter. The passive mixer is configured to translate the baseband impedance to a higher frequency. The translated baseband impedance forms a high-Q notch filter and is presented at the input of the FTNF. The FTNF can be fully integrated in CMOS IC technology (or others, e.g., Bipolar, BiCMOS, and SiGe) and applied in wireless receiver systems including EDGE/GSM, Wideband Code Division Multiple Access (WCDMA), Bluetooth, and wireless LANs (e.g., IEEE 802.11). In addition, embodiments of a multi-band SAW-less RF receiver front-end and techniques to share components of FTNFs included within the multi-band SAW-less RF receiver front-end are presented.

Abstract: Receiver architectures and related methods are disclosed for high definition (HD) and digital radio FM broadcast receivers. The radio receiver architectures are configured to utilize multiple analog-to-digital converters (ADCs) to handle the digital radio spectrum and can be configured to modify a target IF frequencies depending upon the mode of operation of the receiver. For example, the receiver can include an analog FM reception mode and a digital FM reception mode for which different down-conversions are used for the same analog-plus-digital audio broadcast channel. If desired, the radio broadcast receivers disclosed can be configured so that they only receive digital FM radio content, for example, if the analog FM broadcast was of no interest and/or if the broadcast was all digital.

Abstract: In one embodiment, a satellite communications system includes first and second receivers, splitters, and combiners. The first receiver is configured to receive a first microwave communications signal; and the first splitter is coupled to the first receiver and configured to split the first microwave communications signal into at least first and second channels. The second receiver is configured to receive a second microwave communications signal; and the second splitter is coupled to the second receiver and configured to split the second microwave communications signal into at least third and fourth channels. The first combiner is coupled to the first and second splitters and configured to combine the first and third channels to form a third microwave communications signal; and the second combiner is coupled to the first and second splitters and configured to combine the second and fourth channels to form a fourth microwave communications signal.

Abstract: A circuit, electrical device or other apparatus for band stacking and/or band translating multiple transmissions. Such transmissions may be satellite transmissions, terrestrial transmissions, signals carried across a wired network such as a cable network, and so forth. Two sets of left-hand polarized and right-hand polarized signals may be accepted by an embodiment. One left-hand polarized signal and one right-hand polarized signal may be band stacked such that the left-hand polarized signal occupies a first frequency and the right-hand polarized signal occupies a second frequency, thereby permitting the two signals to be transmitted simultaneously across a single transmission line as a first unique signal. The second left-hand polarized signal and second right-hand polarized signal may likewise be combined into a second unique signal for transmission. The first and second unique signals may be stacked as a first stacked output and a second stacked output by a band translating circuit.

Abstract: Radio-frequency (RF) circuits, methods and systems are implemented according to a variety of embodiments. According to one such embodiment, a radio-frequency (RF) receiver circuit is implemented with an adjustable RF filter circuit in a receive path of the RF receiver circuit. A local oscillator (LO) generates a LO signal and an RX_LO signal from the LO signal. A mixing circuit mixes a signal received from the adjustable RF filter circuit and the RX_LO signal. An intermediate-frequency (IF) circuit generates an IF_cal signal at the receiver circuit. A calibration circuit implements both a calibration mode and a receive mode. In the calibration mode, a calibration signal is injected into the receive path. A setting of the adjustable RF filter circuit is determined. In the receive mode, the calibration circuit disables the injection of the calibration signal into the receive path of the RF receiver circuit.

Abstract: According to one embodiment, a radio frequency receiver includes a quadrature mixer for converting radio frequency signals to baseband signals or intermediate frequency signals. The quadrature mixer includes an in-phase passive mixer and a quadrature-phase passive mixer. Each passive mixer includes a mixer core having a plurality of mixer input switch transistors and a plurality of output switch transistors connected to the mixer input switch transistors. Clock circuitry generates a first set of clock signals and a second set of clock signals. The first set of clock signals has a frequency twice that of the second set of clock signals. The first set of clock signals is arranged to drive the mixer input switch transistors and the second set of clock signals is arranged to drive the output switch transistors.

Abstract: A mixer such as an I/Q mixer, having an amplifier having first and second inputs and an output. The first input corresponding to, for example, an I input, and the second input corresponding to, for example, a Q input. The mixer also including a multiple way (M-way) switch having a single input in communication with the output of the amplifier; a frequency control input; and at least four outputs. The frequency control input is configured to receive a periodic signal, and the M-way switch is configured to switch a signal received on the single input to each of the at least four outputs at a switching frequency that is determined by the periodic signal. The M-way switch is operable to switch the input signal received on the single input to each of the at least four outputs in a serial fashion.

Abstract: An integrated tuner is programmable to optimize its components for either analog signal reception or digital signal reception. Power to the components is increased for analog operation and decreased for digital operation. The tuner also includes a selectable and integrated low noise amplifier that may be selected for single-signal reception and bypassed for multi-signal reception.

Abstract: A downconversion mixer with IM2 cancellation includes a mixer, an IM2 generator, and a scaling unit. The mixer frequency downconverts an input RF signal with an LO signal and generates an output baseband signal. The IM2 generator includes first and second field effect transistors (FETs) that receive the input RF signal and generate an intermediate signal having IM2 distortion. The scaling unit scales the intermediate signal to generate a scaled signal and further combines the scaled signal with the output baseband signal to cancel IM2 distortion in the output baseband signal. The IM2 generator may further include first and second amplifiers coupled between the source and gate of the first and second FETs, respectively. Different amounts of IM2 distortion and different temperature variation patterns may be generated in the intermediate signal by using different gains for the amplifiers.

Abstract: Digital mixers which permit mixing of asynchronous signals may be constructed of Rapid Single Flux Quantum (RSFQ) logic elements. The logic elements may include an RSFQ non-destructive readout cell (NDRO), an RSFQ D flip-flop, an RSFQ XOR circuit, and an RSFQ T flip-flop. A binary tree arrangement of T flip-flops can be used to provide in-phase and quadrature phase-divided replicas of a reference signal. The mixing elements can be either an XOR circuit, a dual port NDRO circuit functioning as a multiplexer or an RS type NDRO functioning as an AND gate. The RSFQ logic elements utilize Josephson junctions which operate in superconducting temperature domains.

Abstract: First and second signal processing units are each configured by an IC, so that the circuit space occupying in a receiver apparatus can be reduced. The signal path can be shortened from a BPF section inputting a program signal coming from a broadcasting station to a demodulation section compared with the related art. The transmission loss on the signal path can be thus reduced compared with the related art. The possible route for noise entering from the outside to the first and second signal processing units can be made as short as possible. This enables to reduce the noise entering from the outside, and prevents the signals coming over the signal path from being attenuated by the noise so that the signal reception sensitivity can be increased.

Abstract: Receiver architectures and related methods are disclosed for high definition (HD) and digital radio FM broadcast receivers. The radio receiver architectures are configured to utilize multiple analog-to-digital converters (ADCs) to handle the digital radio spectrum and can be configured to modify a target IF frequencies depending upon the mode of operation of the receiver. For example, the receiver can include an analog FM reception mode and a digital FM reception mode for which different down-conversions are used for the same analog-plus-digital audio broadcast channel. If desired, the radio broadcast receivers disclosed can be configured so that they only receive digital FM radio content, for example, if the analog FM broadcast was of no interest and/or if the broadcast was all digital.

Abstract: A receiver comprising at least one micro-electromechanical system (MEMS) antenna-select switch, a MEMS filter bank communicatively coupled to the antenna-select switch and a plurality of intermediate frequency modules communicatively coupled to the MEMS filter bank and the non-MEMS filter array, wherein each independent channel supported by the receiver has at least one associated intermediate frequency module.

Abstract: A communication system with variable filter bandwidth includes a first mixer circuit configured to receive a communication signal and shift the frequency range of the communication signal to a first frequency range. A second mixer circuit is configured to receive the same communication signal and shift the frequency range of the communication signal to a second frequency range. An activation circuit is coupled to the first and second mixer circuits so as to provide an activation signal that activates at least one of the mixer circuits. A plurality of filter circuits are provided such that each filter circuit is configured to receive a signal from a corresponding mixer circuit, when the corresponding mixer circuit is activated.