6 results about "Double 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.

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.

The application discloses a broadband microwave photon phase noise measuring device and method, which comprises a laser, an electro-optic intensity modulator, a plurality of optical fiber couplers, a single-mode optical fiber, a tunable laser, a first tunable optical fiber delay line, a second tunable optical fiber delay line, a first photoelectric detector, a second photoelectric detector, a first filter, a second filter, a first amplifier, a second amplifier, a double balanced mixer, a low pass filter and a signal analyzer. The high-frequency microwave signal to be measured is down-converted into a low-frequency electric signal by using an optical heterodyne technique, and filtering is realized in the electric domain, so that the limitation of devices such as an electric mixer, an electric filter, an electric amplifier and an optical filter on the measurement frequency of the system is avoided, and the working bandwidth of the phase noise measuring system is expanded; by matching the delay of the first branch and the second branch, the influence of the local light source noise on the noise floor of the phase noise measuring system is suppressed, so that the phase noise measuring sensitivity of the system is improved.

This disclosure provides a radio frequency receive circuit, a receiver, and an electronic device, to reduce interference of noise to a first voltage signal, thereby expanding an application scope of the radio frequency receive circuit. The radio frequency receive circuit may include a coupling circuit, the gain adjustment circuit, and a dual balanced frequency mixer. The coupling circuit may be configured to: convert a first radio frequency signal into at least two second radio frequency signals, and output the at least two second radio frequency signals to the gain adjustment circuit. The gain adjustment circuit may be configured to: selectively amplify or attenuate a gain of each second radio frequency signal, and output at least two third radio frequency signals to the dual balanced frequency mixer. The dual balanced frequency mixer may be configured to mix the at least two third radio frequency signals based on a local oscillation signal.

The millimeter wave broadband tunable filter comprises an orthogonal coupler I, two paths of core circuits, an orthogonal coupler II and an LO matching circuit, wherein each core circuit comprises a double-balanced mixer I, a baseband amplifier and a double-balanced mixer II; the quadrature coupler is based on a transformer structure, and adopts differential input and output to realize a phase quadrature distribution function, so that a single-phase 50% duty ratio clock signal is alternatively used, and the generation difficulty of a non-overlapping high-frequency local oscillator signal is reduced; the baseband amplifier adopts a two-stage structure, the first stage is a differential amplifier structure and provides high gain, the second stage adopts a source follower structure and ensures good frequency response (wide bandwidth), and the baseband amplifier adjusts the cut-off frequency of the amplifier by controlling the size of injection current Iss and realizes filtering bandwidth control. The gain of the baseband amplifier effectively compensates the insertion loss of the filter.