723 results about "Frequency mixer" patented technology

The invention relates to the technical field of signal detection, in particular to a weak electric field signal detection method and system. According to the invention, complete information of frequency, amplitude and phase of a to-be-measured electric field signal is obtained at the same time in one measurement of the injection locking phonon laser, a to-be-measured laser amplitude spectrum and a to-be-measured laser phase spectrum are generated by the same injection locking phonon laser, and the amplitude signal and the phase signal which are measured and received must arrive at the same time. The two are simultaneous in time and have natural orthogonality in physics; therefore, compared with a traditional double-phase lock amplifier for analyzing two asynchronous signals to be measured received by two frequency mixers, the method for analyzing the laser amplitude spectrum and the laser phase spectrum to be measured to obtain the electric field information to be measured has the advantages that the accuracy is higher; the double-phase lock amplifier solves the technical problem of measurement errors caused by deviation of to-be-measured signals received by two frequency mixers in a traditional double-phase lock amplifier.

The invention provides a signal transceiving test system for simulating a shared local oscillator and a calibration method thereof, and the system comprises a signal generation module which outputs a baseband signal; the first local oscillator module comprises a first clock source, a first phase-locked loop and a first frequency multiplication channel, and the first frequency multiplication channel outputs a first local oscillator signal; the first frequency mixer is used for mixing the baseband signal and the first local oscillator signal to generate a modulation signal; the second local oscillator module comprises a second clock source, a second phase-locked loop and a second frequency multiplication channel, and the second frequency multiplication channel outputs a second local oscillator signal; the second frequency mixer is used for mixing the modulation signal and the second local oscillation signal to generate a demodulation signal; the signal analysis module is used for receiving and analyzing the demodulated signal; and the controller adjusts the first phase-locked loop or the second phase-locked loop. The problem that the phase difference of different local oscillators cannot be predicted can be solved while mutual interference of the shared local oscillators is avoided, so that the test calibration precision is improved.

A system may include a digital front end (DFE). The DFE may be configured to generate a command signal. The system may also include a sweeper. The sweeper may be configured to generate an intermediate in-phase signal, an intermediate quadrature signal, and a LO signal based on the command signal. In addition, the system may include a mixer. The mixer may be configured to generate a mixed in-phase signal based on the intermediate in-phase signal and the LO signal. The mixer may also be configured to generate a mixed quadrature signal based on the intermediate quadrature signal and the LO signal. Further, the system may include an amplifier. The amplifier may be configured to generate an in-phase signal based on the mixed in-phase signal and an amplification setting. The amplifier may also be configured to generate a quadrature signal based on the mixed quadrature signal and the amplification setting.

The invention discloses a DP-MZM-based reconfigurable mixer with phase shift and image rejection functions, and belongs to the field of microwave photon signal processing. By adjusting an input radio frequency signal and a direct current bias voltage of the DP-MZM1, four different LO frequency doubling and mixing functions can be realized. By controlling the angle alpha between the polarization direction of the polarization analyzer and one axis of the modulator, the phase of the generated signal can be flexibly tuned in the range of 0-360 degrees. When combined with the optical frequency comb, the multi-channel multi-band frequency conversion system can be expanded into a multi-channel multi-band frequency conversion system with independent phase tuning capability by utilizing the channel switching and frequency slot selection functions of the wavelength selection switch, and parallel output of various frequency mixing results can be realized. By adjusting the phase difference between the two-channel output signals, I / Q mixing, double-balanced mixing and image rejection mixing can be configured. The scheme is not influenced by direct current bias drift, the system complexity is reduced, and the frequency conversion efficiency is improved.

The invention relates to a 92GHz MIMO roadside radar radio frequency system based on a frequency conversion assembly, and the radar radio frequency system comprises a baseband processing layer which comprises at least two cascaded millimeter wave system-level SoC chips; the frequency conversion layer is a frequency conversion module FCM, and the FCM comprises a local oscillator synthesis unit, an upper mixer group and a lower mixer group; the local oscillation synthesis unit is used for generating a 13GHz local oscillation signal; the input end of the upper mixer group is connected with the output end of the baseband processing layer, the local oscillation end of the upper mixer group is connected with the local oscillation synthesis unit, the output end of the lower mixer group is connected with the input end of the baseband processing layer, and the local oscillation end of the lower mixer group is connected with the local oscillation synthesis unit; and the down-conversion layer is used for down-converting 92-94 GHz echo signals received by the antenna array to 79-81 GHz and then outputting the echo signals to the baseband processing layer. According to the invention, 92-94 GHz frequency conversion can be realized.

The invention discloses a beat frequency comparison device mediated by an optical frequency comb. The beat frequency comparison device comprises the optical frequency comb, a first frequency stabilized laser, a first beat frequency device, a first frequency mixer, a first high-pass filter, a second frequency stabilized laser, a second beat frequency device, a second frequency mixer, a second high-pass filter, a DDS signal generator, a third frequency mixer and a low-pass filter. Frequency-stabilized lasers output by the first frequency-stabilized laser and the second frequency-stabilized laser and an optical frequency comb output by the optical frequency comb are subjected to beat frequency in the first beat frequency device and the second beat frequency device respectively, and first beat frequency and second beat frequency are obtained; the first beat frequency and the second beat frequency are mixed with the carrier envelope offset frequency of the optical frequency comb, and a first sum frequency and a second sum frequency are filtered out; the first sum frequency obtains a synthetic frequency through direct digital frequency synthesis; the second sum frequency and the synthetic frequency are mixed in the third mixer, and then the difference frequency is filtered out through the low-pass filter. According to the invention, beat frequency comparison of frequency-stabilized lasers with different wavelengths can be realized, and the influence of the stability of the optical frequency comb is avoided.

One or more systems, devices and / or methods of use provided herein relate to a baseband filter that can be used in a current-mode end-to-end signal path. The current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. In one or more embodiments, a device used in the signal path can comprise a baseband filter that receives an input current and outputs an output current. The baseband filter can comprise a feedback loop component having an active circuit branch and a passive circuit branch coupled in a loop. A mirroring device can be coupled to the feedback loop component and can provide an output of the device. Selectively activating the mirroring device can vary gain, such as of the mirroring device.

The invention relates to the technical field of laser radars, in particular to a non-aliasing frequency-modulated continuous wave radar detection system and method, and the system comprises a light source, a beam splitter, a circulator, a 90-degree mixer, a signal conversion module and a signal processing unit. The signal processing unit is configured to construct a composite vector signal S based on the first electric signal I and the second electric signal Q, S = I + jQ, j is an imaginary part operator, obtain a double-sideband spectrum based on the composite vector signal S, determine the frequency of a signal peak in an upper frequency sweeping period and the frequency of a signal peak in a lower frequency sweeping period in the double-sideband spectrum, and determine the frequency of the signal peak in the upper frequency sweeping period and the frequency of the signal peak in the lower frequency sweeping period; and obtaining the distance and speed of the target to be measured based on the frequency of the signal peak in the upper frequency sweeping period and the frequency of the signal peak in the lower frequency sweeping period. According to the invention, the problem of signal aliasing during detection of the to-be-detected target can be solved at least.

Circuitry is provided that includes a matching circuit, a first mixer coupled to the matching circuit and configured to receive a signal with an oscillation frequency, a second mixer coupled to the matching circuit, a first transmission line path coupled between the matching circuit and an input of the first mixer, and one or more capacitors coupled to the input of the first mixer and configured to reject signals at a harmonic frequency of the oscillation frequency. The wireless circuitry can further include a second transmission line path coupled between the matching circuit and an input of the second mixer. The transmission line path can include a first transmission line for conveying signals between the matching circuit and the first mixer, a second transmission line for conveying signals between the matching circuit and the first mixer, and a floating transmission line interposed between the first and second transmission lines.

The application provides a kind of FMCW laser radar signal processing method and system, method includes: the laser signal generated by laser is divided into measurement light signal and local light signal;Input measurement light signal to light modulator, modulate by modulated sine wave sweep signal;Amplify modulated measurement light signal, emit to the detection target by circulator, collimating mirror, receive reflected signal;Coupling with reflected signal, enhance the energy of signal light, carry out photoelectric signal conversion;Amplify converted electrical signal, carry out electrical mixing in mixer, output intermediate frequency signal;Low-pass filter processing is carried out to intermediate frequency signal;In signal processing system, intermediate frequency signal is converted into pulse square wave by high-speed comparator, carries out capacitance analog interpolation processing, measures intermediate frequency signal period, calculates intermediate frequency signal frequency value.The application solves the technical problem that the counting error of ±1 word leads to the period of to-be-measured intermediate frequency signal, the distance calculation precision of detection target is low.

In a first aspect, the disclosure provides an apparatus (412a) for wireless communication, comprising: a first clock loop (420) comprising a first plurality of latches (422, 424) that generate a first plurality of clock signals (I, Q) having a corresponding first plurality of phases (I, Q); and a second clock loop (430) comprising a second plurality of latches (432, 434) generating a second plurality of clock signals (I45, Q45) having a corresponding second plurality of phases, where the first clock loop is configured to be enabled or disabled based on the first enable signal and the second clock loop is configured to be enabled or disabled based on the second enable signal. And wherein the second clock loop is configured to be enabled or disabled based on a second enable signal (en).

In one embodiment, an apparatus includes a baseband processor to generate a baseband signal and a digital pre-distortion (DPD) circuit to pre-distort the baseband signal with compensation information obtained from a lookup table. The lookup table may have a plurality of entries each to store a pre-distortion value, the lookup table to be addressed based on a target output power level of the baseband signal. The apparatus also may include a converter to convert the pre-distorted baseband signal to an analog signal and radio frequency (RF) circuitry comprising: a mixer to upconvert the analog signal to a pre-distorted RF signal, and a power amplifier to amplify the pre-distorted RF signal.

Mixer circuitry can include a first pair of transistors coupled to a first tail node and configured to receive a local oscillator signal, a second pair of transistors coupled to a second tail node and configured to receive the local oscillator signal, a first digital-to-analog converter, a second DAC coupled between the first DAC and of the first pair of transistors, and a third DAC coupled between the first DAC and the second pair of transistors. During a first phase, control circuitry can sweep the first DAC to trim a first and / or other odd order local oscillator feedthrough. During a second phase, the control circuitry can sweep the second DAC to trim a second and / or other even order local oscillator feedthrough. During a third phase, the control circuitry can sweep the second and third DACs to reject signals associated with a second harmonic conversion gain of the mixer circuitry.

The invention provides a bypass multi-core particle interconnection structure for a baseband signal processing system. The bypass multi-core particle interconnection structure comprises radio frequency core particles, a baseband signal processing unit and control processor core particles or DMA (Direct Memory Access), wherein the control processor core particle is responsible for processing upper-layer communication protocol data; the radio frequency core particle comprises an A / D converter, a frequency mixer and a power amplifier and is used for processing radio frequency signal data; the baseband signal processing unit comprises baseband core particles and at most two stages of baseband accelerator core particles; the baseband core particle is used for realizing baseband signal processing and is divided into two independent parts, namely a transmitting part and a receiving part; the baseband core particle is directly connected with the control processor or the DMA, the baseband core particle is directly connected with the radio frequency core particle, and the interface is an inter-core-particle high-speed digital signal interconnection interface; and the baseband core particles and the baseband accelerator core particles are connected in a cascading manner. According to the invention, a baseband signal processing system is more flexible, different protocol algorithms can be configured as required, switching of multiple communication systems is realized, and all protocols do not need to be preset in a baseband core particle.

The invention relates to a multichannel down-conversion chip, a multichannel down-conversion circuit and a receiver, and the chip comprises a local oscillator signal processing module which accesses a local oscillator signal, carries out the amplification and power division of the local oscillator signal, and obtains a plurality of local oscillator power division signals; based on the local oscillator power division signal, phase shifting is carried out to obtain a phase-shifted local oscillator signal, and the phase-shifted local oscillator signal is input of a frequency mixer in a corresponding channel; each channel of the multi-channel module is provided with a radio frequency amplifier, a frequency mixer and an intermediate frequency amplifier which are connected in sequence, the input end of each radio frequency amplifier is used for accessing a received radio frequency signal, and the output end of each intermediate frequency amplifier is the output end of the corresponding channel; by adopting the chip, the number of components required in the down-conversion circuit can be effectively reduced, the manufacturing cost of the down-conversion circuit is reduced, and the plurality of components such as the radio frequency amplifier, the frequency mixer and the intermediate frequency amplifier are integrated in the same chip, so that the size of the down-conversion circuit can be reduced, and the miniaturization requirement can be met.

This disclosure provides systems, methods, and devices for wireless communications that support enhanced two-stage low-noise amplifiers with feedforward circuitry. In a first aspect, a receiver circuit includes a two-stage low-noise amplifier (LNA) configured to amplify a radio frequency (RF) input signal and output a combined amplified RF input signal to a mixer. The two-stage LNA includes a first gain stage configured to amplify the RF input signal and output the amplified RF input signal to a second gain stage of the two-stage LNA and to the mixer via a feedforward path, and includes the second gain stage configured to amplify the amplified RF input signal received from the first gain stage. The two-stage LNA further includes feedforward circuitry in the feedforward path and configured to provide the amplified RF input signal from the first gain stage to the mixer. Other aspects and features are also claimed and described.

The invention discloses a frequency mixer test method, and relates to the technical field of microwave radio frequency test, and the method comprises the following steps: S1, building a test platform; s2, calibrating the test platform; s3, testing indexes; and according to the received reflection signal and standing wave signal, port isolation test, frequency conversion loss test, port standing wave test and output 1dB compression point test are carried out on the mixer to be tested, and a test curve of each index is drawn after the test is completed. According to the method, all key indexes of the mixer can be tested at different power frequency points through one-time calibration, meanwhile, standing wave testing of the LO port under high power can be achieved, the testing efficiency and accuracy are greatly improved, and the technical problems that in the prior art, multiple times of calibration are needed in the testing process, and the testing efficiency is low are solved.

The invention relates to a transmitting link frequency conversion method for a 92-94 GHz millimeter wave radar system. The method comprises the following steps: acquiring a 79-81 GHz input radio frequency signal and a 13 GHz local oscillator signal; frequency mixing processing is carried out through a frequency mixer, and a frequency mixing output signal containing 92-94 GHz target frequency components and non-target frequency components is generated; determining a frequency parameter, an amplitude parameter and a phase parameter of the non-target frequency component based on the sampling data sequence; generating a compensation signal according to the frequency parameter, the amplitude parameter and the phase parameter of the non-target frequency component; and synthesizing the compensation signal and the frequency mixing output signal to obtain a 92-94 GHz output signal. According to the invention, the frequency spectrum purity of 92-94 GHz output signals is improved.

Architectures are presented for transmitters and receivers that use a harmonic rejection mixer that uses a 6-phase clock signal, while also using a differential in-phase / quadrature input signal (for the transmitter) or output signal (for the receiver). This results in crosstalk between the in-phase and quadrature components, where a digital correction circuit forms a linear combination of the baseband I / Q signals to generate the I / Q for the mixer in order to obtain the desired baseband signal. By using a differential I / Q signal, only two DACs / ADCs are needed, saving circuitry area and power consumption, while providing strong 2nd, 3rd, and 4th clock harmonic rejection. The clock signal can be composed of two sets of 3-phase signals, each signal having a 33% duty cycle.

A method and system for testing the conversion losses of terahertz mixers capable of eliminating the influence of radio frequency sources includes grouping a mixer to be tested and at least two reference mixers in pairs; in each group, inputting a signal of a preset frequency and a preset power at an intermediate frequency port of a first mixer, and after up-conversion, outputting same to a second mixer to be down-converted, so as to obtain an output power with the frequency same as the preset frequency, and obtain the relationship between a first output power and a first preset power and the losses of two mixers; according to the relationship between the loss of the mixer in each group and the power, obtaining the loss of the mixer to be tested.

The invention discloses an ultralow-temperature quantum controller applied to a low-temperature superconducting quantum computer, which comprises an analog circuit part and a digital circuit part, and is characterized in that the analog circuit part comprises two XY channels and three Z channels, each XY channel comprises two signal paths and an on-chip balun; each signal path comprises a nonlinear digital-to-analog converter NLDAC, an intermediate-frequency filter, an adjustable gain amplifier VGA, a quadrature mixer and a quadrature local oscillator signal generator, the input end of the quadrature mixer is connected with the output end of the quadrature local oscillator signal generator, and the output ends of the two signal paths of the XY channel generate XY channel control signals of the XY channel through on-chip balun combination. Each of the three Z channels includes three independent, independently adjustable digital-to-analog converters (DACs) for generating Z channel control signals for the three Z channels. The invention aims to shorten the distance between the controller and the quantum chip, improve the fidelity of the quantum computer and reduce the expense of quantum error correction.

This invention discloses a pilot-type carrier phase recovery circuit and a reverse antenna array system, belonging to the field of 5G millimeter-wave communication. The pilot-type carrier phase recovery circuit includes a digital phase detector, a quadrature mixer, a quadrature voltage-controlled oscillator, a low-pass filter, a high-pass filter, a polyphase filter, a loop filter, a first intermediate frequency amplifier, a second intermediate frequency amplifier, a first shaping circuit, and a second shaping circuit. Applied to a reverse antenna array system, this invention performs carrier phase recovery on the data signal and pilot signal output from the receiver, separating the data signal without spatial phase information and the spatial phase information used for reverse transmission. This invention enables high-order modulation full-duplex communication and real-time tracking of moving targets, featuring high integration, small area, high communication speed, and strong anti-interference capability.

A control system (1) for controlling a microwave output system (2) for emitting electromagnetic radiation to at least two registers (3), each comprising at least one ion for quantum computing, comprising: an integrated circuit (5), a local oscillator (6), at least two digital-to-analog converter systems (7), each connected to the integrated circuit (5), and at least two frequency mixers (8), each connected to the local oscillator (6), wherein each of the at least two digital-to-analog converter systems (7) is connected to one of the at least two frequency mixers (8), and each of the at least two frequency mixers (8) is connected to at least one part of the microwave output system (2) that is assigned to one of the at least two registers (3). A quantum computer system (15) is also provided.

The application discloses a compact large-bandwidth 90-degree optical frequency mixer structure based on a silicon nitride waveguide, which comprises a first butterfly-shaped 2x2 MMI, a second butterfly-shaped 2x2 MMI, a third butterfly-shaped 2x2 MMI, a 1x2 MMI and four curved waveguides; a single-end waveguide of the 1x2 MMI serves as a local reference light LO input end; two output ends of the first butterfly-shaped 2x2 MMI are connected with one input port of the second butterfly-shaped 2x2 MMI and the third butterfly-shaped 2x2 MMI respectively through the curved waveguides, one of the two input ends of the first butterfly-shaped 2x2 MMI serves as a signal light Signal input end, and the other port is vacant; the other input port of the second butterfly-shaped 2x2 MMI and the third butterfly-shaped 2x2 MMI is connected with the two output ends of the 1x2 MMI through the curved waveguides. The application has the advantages that the butterfly-shaped 2x2 MMI is adopted, compared with a traditional rectangular structure, the butterfly-shaped structure is smaller in size and is more conducive to integration; the splitting ratio and the phase difference of the butterfly-shaped 2x2 MMI are more flat and the performance is better.

A transceiver and an electronic device including the same are provided. The transceiver includes a first mixer, a noise reduction circuit, a first amplifier, a second amplifier, and an input / output (I / O) port. The first mixer receives first data and a first clock signal, and generates a first signal to be transmitted to an external device based on the first data and the first clock signal. The noise reduction circuit provides a first clock signal to the first mixer. The first amplifier amplifies the first signal received from the first mixer. The second amplifier amplifies a second signal received from an external device. The I / O port is shared by the first amplifier and the second amplifier and is configured to output the amplified first signal and receive the second signal. The noise reduction circuit activates the first clock signal during an activation time interval of the first data and deactivates the first clock signal during a deactivation time interval of the first data.

An antenna and receiver design is described herein that allows a spacecraft to safely and accurately perform an autonomous flight safety system, an ascent, an entry, a re-entry, a landing, and / or an orbit determination. For example, a spacecraft can be equipped with 180-degree dual-opposed antennas and two receivers. A signal captured by a first antenna can be routed to a secondary radio frequency (RF) of the first receiver and to a combiner. A signal captured by a second antenna can be routed to a secondary RF of the second receiver and to the combiner. The mixer can perform the phase combination operation on the signals captured by the first receiver and the second receiver to produce a phase combined signal, and can route the phase combined signal to the primary RF of the first receiver and to the primary RF of the second receiver.

Certain aspects provide a circuit for frequency translation. The circuit includes first mixer circuitry coupled to a load circuit and having a first mixer configured to generate, based on a first differential input signal and a second differential input signal, a first portion of a frequency translated differential signal to be provided to the load circuit, and a second mixer configured to generate, based on a third differential input signal and a fourth differential input signal, a second portion of the frequency translated differential signal. The circuit also includes second mixer circuitry coupled to another load circuit and having a third mixer configured to generate, based on the first differential input signal and the fourth differential input signal, a first portion of another frequency translated differential signal, and a fourth mixer configured to generate, based on the third differential input signal and the second differential input signal, a second portion of the another frequency translated differential signal.

A method for communicating directly with commodity Wi-Fi transceivers (TRXs) via backscatter modulation in an integrated tag device is provided. The method includes sensing an incident Wi-Fi-compliant wake-up signal. The method than reflects the incident Wi-Fi-complaint wake-up signal by encoding data from the tag device such that the reflected signal follows the Wi-Fi standard compliant and can be decoded by another WiFi-device. An integrated device includes a downlink Wi-Fi compatible wake-up receiver that checks timing of Wi-Fi compatible signals for a wake-up packet. The device has a modulator that is turned on in response to the wake-up packet and a mixer in the modulator hat mixes tag data with a payload packet from received Wi-Fi payload. Backscatter switches backscatter the response.

The invention relates to a ground penetrating radar system. Comprising a signal generation and data acquisition part which comprises a main control module used for generating Gray complementary codes; wherein the code length and the rate of the Gray complementary code can be adjusted, and the Gray complementary code comprises a Gray complementary code A and a Gray complementary code B; the power divider is used for performing power division processing on the Gray complementary code to generate a first path of power division signal and a second path of power division signal; wherein the first path of power division signal is the same as the second path of power division signal; the first acquisition module is used for acquiring a first path of power division signal and taking the first path of power division signal as a reference signal; the first power amplifier is used for amplifying the second path of power division signal to obtain an amplified power division signal; and the first frequency mixer is used for performing frequency conversion processing on the amplified power division signal and a local oscillation signal to obtain a first frequency conversion signal. According to the invention, the detection precision can be improved, and the detection effect is improved.