12 results about "Balanced mixer" patented technology

Apparatus and methods are provided for self-phase alignment in a phased-array transceiver. Detectors receive a first signal from a TX-path input of a first channel and a second signal from an RX-path output of a second channel, producing a DC value representing the phase difference between the signals, iteratively adjust RX phase shifters based on the DC values until the phase difference equals a predetermined amount, then apply a corrective phase opposite in sign and equal in magnitude to that amount to generate a final alignment value for normal operation. The predetermined amount may be ±90°. Each detector may include twin double-balanced mixers, a low-pass filter, and comparator. In one embodiment, a TX phase alignment is performed before the RX phase alignment, no additional RX-phase correction is required when the TX phase-offset values determined by the TX alignment are applied to each TX phase shifter for the RX alignment.

The utility model discloses a millimeter wave secondary down-conversion module, which relates to the technical field of microwave electronics, adopts a double-balanced mixer to integrate frequency conversion, filtering amplification and power division monitoring functions in the module, and compared with the traditional scheme, the millimeter wave secondary down-conversion module has the advantages that the volume is greatly reduced, and the cost is reduced. The shunt signals of the power divider are subjected to frequency conversion dynamic adaptation and intelligent AGC closed-loop control through the detection module, so that the technical bottlenecks of the traditional down-conversion module in volume, frequency band stiffness and reliability are overcome, and meanwhile, the rapid deployment capability of one module and multiple scenes is realized; and a high-performance and low-cost millimeter wave receiving solution is provided for 6G communication, a low-orbit satellite terminal and an intelligent radar system.

Systems, circuits, and methods for mixing signals are provided. An illustrative circuit may include mixer circuitry including multiple inputs and at least one output, where the multiple inputs are connected across a local oscillator. The circuit may further include a terminal Radio Frequency (RF) output circuitry that is isolated from the local oscillator, where the at least one output of the mixer circuitry is directly connected to an input of the terminal RF output circuitry. The circuit may further include terminal Intermediate Frequency (IF) output circuitry that is isolated from the local oscillator, where the at least one output of the mixer circuitry is directly connected to an input of the terminal IF output circuitry.

The application provides a single-balanced mixer circuit based on a carbon nanotube Schottky diode, comprising the following structure: one end of the carbon nanotube Schottky diode is connected with a 180-degree hybrid junction structure, and one end is connected with a fan-shaped open circuit line structure; a radio frequency input impedance matching network is located between a radio frequency input port and the 180-degree hybrid junction; a local oscillator input impedance matching network is located between a local oscillator input port and the 180-degree hybrid junction; the fan-shaped open circuit line structure is located between the carbon nanotube Schottky diode device and a 1 / 4 wavelength high-impedance microstrip line; the 1 / 4 wavelength high-impedance microstrip line is located between the fan-shaped open circuit line structure and an air bridge; the air bridge is transversely arranged on the radio frequency input impedance matching network; a thin film resistor and a plate capacitor are connected on a intermediate frequency output line. The mixer circuit provided by the application can realize lower conversion loss in a high frequency band, and greatly reduces the parasitic capacitance of the Schottky diode device and the substrate loss of the passive device.

This application relates to the field of microwave radio frequency technology, and in particular to a single-balanced mixer and system integrating second harmonic extraction and self-shielding functions. The single-balanced mixer includes: a branch-line coupler, a diode mixer unit, an RF input port, a local oscillator input port, and an intermediate frequency (IF) output port. The branch-line coupler includes two parallel transmission arms and two series transmission arms. The RF input port and the local oscillator input port are respectively connected to the input terminals of the branch-line coupler. The signal input terminal of the diode mixer unit is connected to the output terminal of the branch-line coupler, and the output terminal of the diode mixer unit is connected to the IF output port. A second harmonic extraction port is led out on the transmission line between the output terminal of the branch-line coupler and the signal input terminal of the diode mixer unit. By adopting this application, down-conversion of down-going reception and extraction of up-going second harmonic carrier are simultaneously achieved, solving the self-interference problem between transmission and reception, simplifying the circuit structure, and improving the RF energy utilization rate.

Method and apparatus are provided for self-phase and self-amplitude alignment for RF transmission. In one novel aspect, the apparatus directly compares the phase and amplitude at RF frequency and then adjusts the phase and amplitude as needed at RF frequency. In one embodiment, the apparatus includes a plurality of detectors, each being coupled between radio frequency (RF) signals of two channels. The detector is switchable between a phase-detection mode that detects and outputs a phase direct current (DC) value indicating a phase difference, and an amplitude-detection mode that detects and outputs an amplitude DC value indicating an amplitude difference between. In one embodiment, each detector comprises a twin double-balanced mixers (TDBMs) with identical topology. A controller with a comparator and calibration circuit being configured to adjust phase shifter and / or VGA based on corresponding phase or amplitude offset value.

This application relates to the field of microwave radio frequency technology, and in particular to a single-balanced mixer and system integrating second harmonic extraction and self-shielding functions. The single-balanced mixer includes: a branch-line coupler, a diode mixer unit, an RF input port, a local oscillator input port, and an intermediate frequency (IF) output port. The branch-line coupler includes two parallel transmission arms and two series transmission arms. The RF input port and the local oscillator input port are respectively connected to the input terminals of the branch-line coupler. The signal input terminal of the diode mixer unit is connected to the output terminal of the branch-line coupler, and the output terminal of the diode mixer unit is connected to the IF output port. A second harmonic extraction port is led out on the transmission line between the output terminal of the branch-line coupler and the signal input terminal of the diode mixer unit. By adopting this application, down-conversion of down-going reception and extraction of up-going second harmonic carrier are simultaneously achieved, solving the self-interference problem between transmission and reception, simplifying the circuit structure, and improving the RF energy utilization rate.

The invention discloses a high-performance dual-mode frequency multiplier circuit. The frequency multiplier can be applied to a millimeter wave band, and outputs frequency doubling and frequency tripling signals at the same time. The circuit comprises an input balun, an improved push-push frequency doubler, a frequency tripler based on a single balanced mixer, and an output balun. The input Balun converts an input single-ended fundamental wave signal into a differential signal; the improved push-push frequency doubler comprises a main body push-push frequency doubler formed by field-effect tubes M1 / M2 and a gain-enhanced cross coupling pair formed by field-effect tubes M3 / M4, and is used for completing secondary frequency doubling of a fundamental wave signal, wherein the main body push-push frequency doubler is formed by the field-effect tubes M1 / M2, and the gain-enhanced cross coupling pair is formed by the field-effect tubes M3 / M4. The frequency tripler based on the single balanced mixer completes self-mixing frequency tripling of a fundamental wave signal through output matching inductors L1 and L2 and blocking capacitors C5 and C6; and the output Balun finishes subtraction operation of the two paths of signals and then retains a triple frequency signal. The scheme of the invention has the characteristics of dual-mode frequency multiplication ratio, high gain and simple structure.

The invention, which relates to the technical field of terahertz communication, discloses a dual-polarization double-sideband terahertz front-end receiving system comprising a frequency multiplier, an orthogonal mode converter, an unmatched load coupler, a frequency mixer, a coupler and a low-pass filter. The working frequency of the receiving system is 640 GHz, and the receiving system has multiple functions of frequency mixing, frequency doubling, wave detection, power distribution, coupling, polarization rotation and the like. Compared with a traditional single-polarization receiving structure, the system can receive two kinds of polarization signals at the same time, the instantaneous bandwidth is improved through sideband separation, local oscillator noise and mirror image sideband noise are effectively restrained through the balanced mixer, and therefore the sensitivity of the system is improved. In addition, a traditional plane chain type framework is optimized into a longitudinal stacking framework, high integration of a passive circuit and an active circuit is achieved, and the application requirements of high performance and high integration degree are met.

The application discloses a low-stray intelligent spread spectrum device for a spectrum analyzer, comprising a segmented filter low-stray frequency multiplication chain, a low-loss balanced mixer and an FPGA intelligent module, the segmented filter low-stray frequency multiplication chain is used to realize low-stray frequency multiplication, and a balanced fundamental mixer is combined to improve the stray suppression performance of the spread spectrum device; the single balanced fundamental mixer with a fin line-suspended microstrip line type structure has the advantage of low frequency conversion loss, and greatly improves the dynamic range of the spread spectrum device; the FPGA intelligent module simplifies the setting steps of using the spread spectrum device, improves the convenience and accuracy of measurement, and can be applied to the fields of high-precision and intelligent terahertz instrument measurement.

The invention provides a terahertz quasi-light type superconductive heat electron balanced mixer, and belongs to the technical field of terahertz detection. Comprising a super heat conduction electronic balanced mixer, a bias T-type network, a direct current bias source and a 180-degree synthesizer, the superconductive heat electronic balanced mixer is composed of a crossed double-groove antenna, a superconductive microbridge and a choke filter. Quasi-optical coupling of an orthogonal local oscillator reference signal and a terahertz signal to be measured is achieved through the crossed double-groove antenna, and the signals are transmitted to the superconducting microbridges in the centers of the four single-groove antennas to be subjected to frequency mixing processing. The direct-current bias source provides working direct-current bias for the superconductive heat electronic balanced mixer. High-frequency components of intermediate-frequency signals generated by frequency mixing are filtered out through the choke filter, and the intermediate-frequency signals enter the 180-degree synthesizer to be subjected to phase synthesis, so that local oscillator leakage and even-order harmonics are effectively inhibited, and meanwhile, the port isolation and the signal purity are improved. The method has remarkable advantages in the aspects of interference suppression, dynamic range expansion and system noise reduction, and is particularly suitable for terahertz astronomical observation and the like.

Systems, circuits, and methods for mixing signals are provided. An illustrative circuit may include mixer circuitry including multiple inputs and at least one output, where the multiple inputs are connected across a local oscillator. The circuit may further include a terminal Radio Frequency (RF) output circuitry that is isolated from the local oscillator, where the at least one output of the mixer circuitry is directly connected to an input of the terminal RF output circuitry. The circuit may further include terminal Intermediate Frequency (IF) output circuitry that is isolated from the local oscillator, where the at least one output of the mixer circuitry is directly connected to an input of the terminal IF output circuitry.