62results about How to "Low intermodulation" patented technology

The invention concerns a wireless microphone system. The object of the present invention is to further develop such wireless microphone systems. A further aim of the invention is to provide an improvement in the intermodulation spacing of HF transmitters so that more transmitters can be used in the same frequency band. A wireless microphone system comprising antennae connected thereto, wherein a circulator and / or an HF isolator is connected to the antennae or the antenna.

A passive CMOS differential mixer circuit with a mismatch correction circuit for balancing the electrical characteristics of the two output paths. Once the output paths of the differential circuit are balanced, or matched as closely as possible, second order intermodulation product generation can be inhibited or at least reduced to acceptable levels. The mismatch correction circuit receives a digital offset signal, and generates one or more voltage signals to be selectively applied to the signal paths of the passive differential mixer circuit. The voltage signals can be adjusted back gate bias voltages applied to the bulk terminals of selected transistors to adjust their threshold voltages, or the voltage signals can be adjusted common mode voltages applied directly to a selected signal path. Since the differential mixer circuit is passive, no DC current contribution to noise is generated. The switching transistors of the mixer circuit can be maintained at minimal dimensions to reduce switching signal drive loading, resulting in lower power consumption and higher operating frequencies than if larger switching transistors were used.

The embodiments of the present invention include a bias circuit for a power-amplifying device, which receives and amplifies an input RF signal having a series of RF cycles within a modulation envelop. The bias circuit compensates odd-order distortion processes by detecting the power in the input signal and providing a dynamic adjustment to a bias stimulus for the power-amplifying device within a time scale of the modulation envelope.

A passive CMOS differential mixer circuit with a mismatch correction circuit for balancing the electrical characteristics of the two output paths. Once the output paths of the differential circuit are balanced, or matched as closely as possible, second order intermodulation product generation can be inhibited or at least reduced to acceptable levels. The mismatch correction circuit receives a digital offset signal, and generates one or more voltage signals to be selectively applied to the signal paths of the passive differential mixer circuit. The voltage signals can be adjusted back gate bias voltages applied to the bulk terminals of selected transistors to adjust their threshold voltages, or the voltage signals can be adjusted common mode voltages applied directly to a selected signal path. Since the differential mixer circuit is passive, no DC current contribution to noise is generated. The switching transistors of the mixer circuit can be maintained at minimal dimensions to reduce switching signal drive loading, resulting in lower power consumption and higher operating frequencies than if larger switching transistors were used.

The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (HFR), wherein a new component at frequency QΩ+Ωq is generated on the basis of existing components at Ω and QΩ+Ωq. The invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. Superposition of several modified samples has the net effect of limiting undesirable intermodulation products, thereby enabling a coarser frequency resolution and / or lower degree of oversampling to be used. In one embodiment, the invention further includes a window function suitable for use with block-based cross-product enhanced HFR. A hardware embodiment of the invention may include an analysis filter bank (101), a subband processing unit (102) configurable by control data (104) and a synthesis filter bank (103).

A system for generation of jamming signals and related and techniques are described.

The present patent application comprises a linear transconductor having at least one input and at least one output, comprising a differential amplifier having a plurality of transistors and a plurality of inputs, wherein a difference of input signals is amplified, a cascode circuit having a plurality of transistors, wherein the transistors are operably connected to the differential amplifier, wherein reverse isolation between an input and an output of the linear transconductor is improved by decoupling the input and the output of the linear transconductor by mounting at least one transistor of the plurality of transistors of the cascode circuit as a common-gate stacked on the at least one transistor of the differential amplifier, an active load having a plurality of transistors operably connected between the cascode circuit and supply voltage, and an auxiliary device operably connected to the connection between the active load, the cascode device and ground.

An intermodulation product reduction or cancellation amplifier received two input signals that are split in quadrature wherein the inphase outputs are summed and then amplified as an inphase signal, and the quadrature outputs are fixed-phase phase-shifted, then summed and then amplified as a quadrature signal. The inphase and quadrature signals are fed into an output hybrid for canceling intermodulation products, where the fixed-phase phase shift is + / −60° for reducing 3rd order, + / −36° for reducing 5th order, and + / −25.71° for reducing 7th order intermodulation products, for examples, for improved signal communications of the two signals over a common antenna or link.

An intermodulation product reduction or cancellation amplifier received two input signals that are split in quadrature wherein the inphase outputs are summed and then amplified as an inphase signal, and the quadrature outputs are fixed-phase phase-shifted, then summed and then amplified as a quadrature signal. The inphase and quadrature signals are fed into an output hybrid for canceling intermodulation products, where the fixed-phase phase shift is + / −60° for reducing 3rd order, + / −36° for reducing 5th order, and + / −25.71° for reducing 7th order intermodulation products, for examples, for improved signal communications of the two signals over a common antenna or link.

A radio frequency receive coil (50) includes an antenna (52, 52') that is tuned to a magnetic resonance frequency to detect a magnetic resonance signal. Electronics (54) disposed on or with the antenna (52, 52') as a unitary structure include compression circuitry (102, 114, 202, 214, 230, 330, 430, 530) that compresses the magnetic resonance signal at a gain controlled by a gain control signal to produce a compressed magnetic resonance signal. The electronics (54) generate a reduced dynamic range representation of the magnetic resonance signal based on the compressed magnetic resonance signal. The reduced dynamic range representation of the magnetic resonance signal is communicated off the receive coil.

An electronic device includes a DC-DC converter for voltage conversion in a slave mode an in a master mode and including a phase locked loop. The phase locked loop comprises a controlled oscillator, a filter having an integration capacitor coupled to a control input of the controlled oscillator, a charge pump, and a phase frequency detector. In the slave mode, the controlled oscillator, the filter, the charge pump and the phase frequency detector are coupled to operate as the phase locked loop. There is a comparator coupled with an input to a control input of the controlled oscillator and with an output to the charge pump. In the master mode, the comparator is configured to control the charge pump in response to a control signal at the control input of the controlled oscillator when the phase frequency detector is switched off so as to perform a modulation of the control signal at the control input of the controlled oscillator by charging and discharging the integration capacitor.

A nonlinear processor for distorting audio signals having an input stage (15) that is arranged to split an audio input signal (13) into two signal paths and then a pair of asymmetric distortion stages (17, 19), one in each signal path, with non-equal negative and positive saturation limits, so as to produce opposite polarity mean signal levels at their outputs in each signal path, and which produce a smooth transition from linear to nonlinear behaviour. Following the asymmetric distortion stages (17, 19) is a pair of AC-coupled symmetric distortion stages (21, 23), one in each signal path, and an output stage (25) that is arranged to add the two nonlinearly distorted signals from the symmetric distortion stages to generate an audio output signal (27) that demonstrates a smooth transition from linear behaviour to the production of crossover-like artifacts.

A coaxial plug-in connector arrangement is provided having an electrically conductive outer sleeve, and an electrically conductive inner sleeve which is insertable into the outer sleeve in the axial direction and is electrically connectable to the outer sleeve. A first contact pin is insertable into the outer sleeve from a side facing away from the inner sleeve. A second contact pin is insertable into the inner sleeve from a side facing away from the outer sleeve. An insulating part in which an inner conductor part is mounted is located in the inner sleeve. The two contact pins are connectable to one another in an electrically conductive manner via the inner conductor part. An arresting element is mountable on one of the two sleeves before insertion of the inner sleeve into the outer sleeve. The inner sleeve is detachably fixable in the outer sleeve by means of the arresting element.

The invention discloses a TD-LTE (time division-long term evolution) macro base station indoor extension coverage system and a TD-LTE small cell radiofrequency front terminal component. The system comprises a first high-isolation transceiving antenna, a second high-isolation transceiving antenna, a first filter, a second filter, a third filter, a fourth filter, a first AGC (automatic gain control) receiving module, a second ALC (automatic level control) transceiving module, a second AGC receiving module, a second ALC transmitting module and a cellphone chip synchronous monitor module. The system has the advantages that uplink-downlink synchronous time control can be achieved with uplink-downlink time slot synchronous signals without increasing cost, and the signals of an outdoor TD-LTE macro base station are quickly extended to an indoor signal weak region, blind region or an area with low internet speed and poor user experience.

The invention provides a blind-mating radio frequency coaxial connector. The blind-mating radio frequency coaxial connector comprises a female connector and a male connector, wherein the female connector and the male connector are matched and butted, the female connector comprises a first inner conductor, a first outer conductor and a first insulator, the first inner conductor is provided with a strip-shaped accommodating cavity, a clamping ring is arranged on an outer surface, near to a port, of the first outer conductor, the first insulator is used for separating the first inner conductor from the first outer conductor, the male connector comprises a second inner conductor, a second outer conductor and a second insulator, the inner conductor is provided with an extension part, the extension part can be inserted to the accommodating cavity of the first inner conductor, the second outer conductor is provided with an inner cavity and a joint, the inner cavity is connected with the first outer conductor and is tightly matched with the clamping ring on the first outer conductor, the joint can be connected with the first outer conductor in an encircling way and is provided with a plurality of split grooves, the second insulator is used for separating the second inner conductor from the second outer conductor, and a guide hole is formed in a port of the first insulator and is used for guiding the extension part inserted to the accommodating cavity. By the blind-mating radio frequency coaxial connector, the matching of the female connector and the male connector is effectively improved, and low electromagnetic leakage and low intermodulation are ensured.

There are provided a resonator for use in a filter, which interprets and reduces intermodulation distortion by analyzing characteristics of current density occurring at resonance and linear and nonlinear characteristics of the filter, a method for manufacturing filters by using the resonator and a filter manufactured by the method. The resonator has a ratio of an inside diameter to an outside diameter belonging to a range which is larger than about 1:3 and smaller than or equal to about 1:3.75 and its length (H) is about λ / 4, wherein λ is a wavelength of a plane wave provided to the resonator. By employing the method, it is possible to effectively design the filters through the use of a circuitry and structural approach with breaking from a conventional approach depending on local and minute processing steps when manufacturing the filters.

The invention relates to the field of wireless communications, in particular to a wireless communication network optimization device, which comprises a donor antenna, an outdoor signal amplification system, a control module, an indoor signal amplification system and a retransmission antenna. The donor antenna is used for receiving a weak outdoor wireless communication signal and retransmitting an indoor mobile phone user signal after processing of the network optimization device; the outdoor signal amplification system is used for amplifying the power of the received weak outdoor wireless communication signal; the indoor signal amplification system is used for amplifying the power of the received mobile phone user wireless communication signal; the retransmission antenna is used for transmitting an outdoor wireless communication signal after processing of the network optimization device and receiving the mobile phone user wireless communication signal; and the control module is used for controlling operation of the donor antenna, the outdoor signal amplification system, the indoor signal amplification system and the retransmission antenna. The device has the advantages of low manufacturing cost and simple installation.

The invention provides a low-intermodulation compatible type connection radio frequency socket and plug. The socket comprises an outer socket conductor, an inner jack conductor, a socket insulating support, an end face reed and a radial reed. The outer socket conductor is internally provided with an annular groove matched with and coupled to an outer plug conductor. The inner side of the annular groove is the front-segment tongue diameter, and the end face of the annular groove is a mechanical benchmark face. The front-segment tongue diameter and the mechanical benchmark face are designed to be of an integrated structure. The inner plug conductor in the plug is internally provided with an annular groove matched with and coupled to the outer socket conductor and an unlocking sleeve. The inner side of the annular groove is matched with the outer side of a socket-shaped groove in the radial direction, the satisfactory axial matching length is set, and the bottom of the annular groove is the mechanical benchmark face. According to the low-intermodulation compatible type connection radio frequency socket and plug, improvement is conducted on the mechanical benchmark face and electrical benchmark face separating design and contact outer conductor slotting design in the prior art, continuity of full-spectrum characteristic impedance and electric connectivity of a contact port are guaranteed, intermodulation interference and reflection coefficients are further lowered, and wider working bands and excellent return losses are achieved.

A non-reciprocal device includes at least one ferrimagnetic member (21 or 22). By controlling the FMR linewidth ΔH of the ferrimagnetic members (21 and 22), intermodulation distortion is controlled.

Antenna systems have an RF connector, a PCB dipole antenna, and a radome. The RF connector provides a direct connection to the PCB and limits PIM. An omni-directional WiFi antenna has a pair of horizontal dipole antennas on a PCB having different wavelengths and same frequency. An omni-directional UMTS dual antenna has a vertical arrangement of two independent antennas on a PCB and has a jumper printed circuit board connecting the RF connector to the upper antenna. Corresponding connectors, radomes, and ways of combining antenna elements on a single PCB are also disclosed. A single frequency omnidirectional antenna includes both half and full wavelength dipole elements. A plus-shaped radome enhances the omnidirectional radiation pattern of the enclosed antenna. A jumper printed circuit board allows independent antennas on a single circuit board without the degradation of internal coaxial connections. The connector provides a direct interface with a circuit board to reduce the number of parts and also reduce passive intermodulation.

A method includes providing a first local oscillator signal having a first duty cycle to a first mixer unit and providing a second local oscillator signal having a second duty cycle to a second mixer unit. At least one of the first duty cycle or the second duty cycle is greater than fifty percent. A frequency of the first local oscillator signal approximately equals a frequency of the second local oscillator signal. The method may also include generating a modulated output signal based on an output signal of the first mixer unit and based on an output signal of the second mixer unit.

A transceiver front-end for a communication device is connectable to a signal transmission and reception arrangement (310) adapted to transmit a transmit signal having a transmit frequency and to receive a receive signal having a receive frequency. The transceiver front-end is also connectable to a transmitter (330) adapted to produce the transmit signal, and to a receiver (320) adapted to process the receive signal. The transceiver front-end comprises a transmit frequency suppression filter arrangement (351, 352) and a receive frequency suppression filter arrangement (341, 342). The transmit frequency suppression filter arrangement is adapted to suppress transfer of a signal having the transmit frequency and to pass a signal having the receive frequency. The receive frequency suppression filter arrangement is adapted to suppress transfer of a signal having the receive frequency and to pass a signal having the transmit frequency. The transceiver front-end also comprises a transmit frequency cancellation arrangement (371, 372) and a receive frequency cancellation arrangement (361, 362). The transmit frequency cancellation arrangement is adapted to produce a first cancellation signal for cancellation, at receiver nodes (322, 323), of a suppressed signal having the transmit frequency, transferred by the transmit frequency suppression filter arrangement. The receive frequency cancellation arrangement is adapted to produce a second cancellation signal for cancellation, at signal transmission and reception arrangement nodes (312, 313), of a suppressed signal having the receive frequency, transferred by the receive frequency suppression filter arrangement. Corresponding transceiver, communication device and method are also disclosed.

The invention discloses a hole processing method of a low-intermodulation high-frequency module circuit board. The hole processing method comprises the steps of: S1, carrying out hole processing pretreatment; S2, removing stains in a drilling hole; S3, carrying out surface oil removing; S4, carrying out micro-etching; S5, carrying out preimpregnation; S6, carrying out activation; S7, accelerating; S8, carrying out copper deposition in the hole; S9, and carrying out full board electroplating. The hole processing method of the low-intermodulation high-frequency module circuit board can effectively protect the structure of a reverse copper foil surface, is conductive to further reducing interference of transmission signals, and has lower intermodulation.

The present invention relates to a voltage-to-current transconductance stage arrangement comprising a single-ended input, an emitter-coupled pair of transistors, comprising a first transistor and a second transistor, the emitter of a third transistor, being connected to the collector of said first transistor, and differential output. It further comprises at least one common-collector transistor comprising a fourth transistor connected to the base of said second transistor preferably or optionally also and a fifth transistor connected to the base of said third transistor. The size of said fourth, or fourth and fifth transistors considerably exceed the sizes of said second and third transistors. They are biased at ‘off-state’. An extra inductor at the collector of the transistor may be applied to further increase linearity.

The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (HFR), wherein a new component at frequency QΩ+rΩ0 is generated on the basis of existing components at Ω and Ω+Ω0. The invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. Superposition of several modified samples has the net effect of limiting undesirable intermodulation products, thereby enabling a coarser frequency resolution and / or lower degree of oversampling to be used. In one embodiment, the invention further includes a window function suitable for use with block-based cross-product enhanced HFR. A hardware embodiment of the invention may include an analysis filter bank (101), a subband processing unit (102) configurable by control data (104) and a synthesis filter bank (103).

This photoelectric detection device comprises a matrix of elementary detectors on an insulating substrate. Each of the elementary detectors has a stack consisting of a lower electrode, a layer of a photosensitive material and a phototransparent upper electrode. The upper electrode is common to all the elementary detectors. Each of the lower electrodes is connected independently of one another to a sense circuit. The lower electrodes are each positioned on an individualized insulating zone, which is raised with respect to the insulating substrate. Furthermore, the upper electrode is not flat and is inserted between two adjacent zones until it reaches a level below that of the lower electrodes.

The present application relates to an antenna, particularly an antenna for a mobile radio base station, having a plurality of antenna elements and having at least two transmission paths or two reception paths that are connected to two antenna elements of the antenna that are at a physical interval and have a different polarisation, wherein the antenna elements are dielectric antenna elements and / or wherein the single antenna element interval between the antenna elements is less than 0.6 lambda, wherein lambda is the wavelength of the centre frequency of the lowest resonant frequency range of the antenna elements, and to an antenna, particularly an antenna for a mobile radio base station, having at least two antenna elements that are at a physical interval and have a different polarisationand / or are operated at different frequencies, wherein the antenna elements are dielectric antenna elements having at least two separate connections for at least two different polarisations, wherein the single antenna element interval between the antenna elements is preferably less than 0.6 lambda, wherein lambda is the wavelength of the centre frequency of the lowest resonant frequency range of the antenna elements.