15 results about "Double balanced mixer" patented technology

To reduce the power consumption of a frequency converter that performs frequency conversion to upconvert a transmission signal and frequency conversion to downconvert a reception signal.SOLUTION: A frequency converter includes a transistor constituting a double balanced mixer, a load circuit provided on the drain side of the transistor, a first terminal connected to the load circuit, an impedance circuit provided on the source side of the transistor, a second terminal connected to the source of the transistor, a driver circuit that provides a local oscillator signal to the gate of the transistor, and a current control circuit. The current control circuit controls the current flowing from the load circuit to the impedance circuit via the transistor, or the current flowing from the impedance circuit to the load circuit via the transistor.SELECTED DRAWING: Figure 3

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 application discloses an optical frequency comb locking system for eliminating carrier envelope phase shift frequency, and the disclosed system comprises an optical frequency comb, a repetition frequency detector, a carrier envelope phase shift detector, an attenuator, an operational amplifier, a filter, a power divider, a double balanced mixer, a bias voltage and a phase-locked loop; the system extracts the sum and difference frequencies of the repetition frequency and the carrier envelope phase shift frequency of the optical frequency comb, and locks them to each other, so as to realize the carrier envelope phase shift frequency locking to zero frequency, and reduce the difficulty of the optical frequency comb locking. The application solves the problem of high locking difficulty of the traditional optical frequency comb, simplifies the carrier envelope phase shift frequency control, has the feasibility of productization and high integration, has universality, and can be widely applied to different types of optical frequency comb systems.

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.

The application discloses a kind of plasma driving circuit and its driving method, the plasma driving circuit includes double balanced mixer, power setting circuit, error amplifier, voltage-controlled oscillator, single-ended to differential circuit, driving circuit and transformer circuit;The double balanced mixer is connected driving circuit and the transformer circuit respectively, the input of error amplifier is connected double balanced mixer and power setting circuit respectively, the output of error amplifier is connected the input of voltage-controlled oscillator;The output of voltage-controlled oscillator is connected the input of single-ended to differential circuit, the output of single-ended to differential circuit is connected the input of driving circuit respectively;The output of driving circuit is connected the transformer circuit respectively.The plasma driving circuit and its driving method proposed in the application can adjust the frequency by pure hardware, quickly adapt to the sudden change of sample solution, and can ensure the stability of power.

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 invention relates to a passive double-balanced mixer. The passive double-balanced mixer comprises a local oscillator balun, a local oscillator coupling line, a diode ring, a radio frequency balun and an intermediate frequency lead-out circuit. The local oscillator balun and the radio frequency balun are each of a balun structure with three metal layers, and efficient coupling of differential signals is achieved through the mode that single-end signals flow in from the center feed-in point of the third metal structure in the balun structures and the vertically-overlapped microstrip lines. And the amplitude-phase consistency of differential signals is further improved through the local oscillator coupling line with the three-layer metal structure. According to the invention, the isolation performance of the passive double-balanced mixer is enhanced, low frequency conversion loss and high isolation are realized in an ultra-wideband range, and the mixing efficiency and signal integrity of the passive double-balanced mixer are improved.

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 application relates to a passive double-balance frequency mixer. The passive double-balance frequency mixer comprises a local oscillator balun, a local oscillator coupling line, a diode ring, a radio frequency balun and an intermediate frequency lead-out circuit. The local oscillator balun and the radio frequency balun are both three-layer metal layer balun structures, efficient coupling of differential signals is realized by means of flowing single-end signals from a center feed-in point of the third layer metal structure of the balun structure into the vertically-overlapped microstrip line, and the amplitude and phase consistency of the differential signals is further improved through the local oscillator coupling line of the three-layer metal structure. The application enhances the isolation performance of the passive double-balance frequency mixer, realizes lower frequency conversion loss and high isolation in a super wideband range, and improves the frequency mixing efficiency and signal integrity of the passive double-balance frequency mixer.

This invention discloses an oscillator loop phase noise suppression structure and method, relating to the field of microwave signal source technology. It includes: a low 1 / f phase noise amplifier; a first coupler input connected to the output of the low 1 / f phase noise amplifier, with a through port connected to the LO terminal of a double-balanced mixer; an oscillator amplifier input connected to the coupled output of the first coupler; a voltage-controlled phase shifter connected at one end to the oscillator amplifier and at the other end to the input of a second coupler; a power port of the second coupler connected to the RF terminal of the double-balanced mixer; and an IF terminal of the double-balanced mixer connected to the VCP operating voltage port of the voltage-controlled phase shifter after passing through an integrator (PI). By combining the low 1 / f phase noise amplifier with a high-gain amplifier, high gain and ultra-low phase noise can be achieved.

The invention provides a double-balanced mixer, and relates to the technical field of microwave and millimeter wave circuits. The double-balanced mixer comprises a radio frequency plane balun, a local oscillator plane balun, an FET annular mixing core, a first FET tube and a second FET tube, the input end of the local oscillator plane balun is used for receiving a local oscillator signal, and the two output ends of the local oscillator plane balun are connected with the drain electrode of an FET tube in the FET annular mixing core; the input end of the radio frequency plane balun is used for receiving a radio frequency input signal, two output ends of the radio frequency plane balun are respectively connected with the grid electrodes of the first FET tube and the second FET tube, the source electrodes of the first FET tube and the second FET tube are grounded, and the drain electrodes of the first FET tube and the second FET tube are connected with the source electrodes of the FET tubes in the FET annular mixing core; and the drain electrode of the FET tube in the FET annular mixing core is connected to the intermediate frequency signal output end. The problem that a current mixer based on the GaAs HEMT technology is difficult to have the characteristics of low power consumption and small size can be solved.

The utility model discloses a broadband double-balanced mixer, which comprises an annular diode stack formed by sequentially connecting a diode D1, a diode D2, a diode D3 and a diode D4 end to end, and a radio frequency circuit, a local oscillator circuit and an intermediate frequency circuit which are connected with the annular diode stack. A ring bridge circuit formed by Schottky diodes and a coupling line Marchand balun structure are used, and the topological structure of a mixer circuit is improved, so that the working bandwidth is improved, and meanwhile, the chip size is reduced.

The invention relates to the technical field of integrated circuits, and discloses a mixer layout structure, an IQ double-balanced mixer layout structure and electronic equipment. In the invention, four symmetrically arranged MOS transistors (M1, M2, M3 and M4) are symmetrically arranged through a longitudinal symmetry axis and a transverse symmetry axis, grid electrodes of the M1 and the M4 are connected to a first port of a local oscillator, and grid electrodes of the M2 and the M3 are connected to a second port of the local oscillator; the source electrodes of the M1 and the M2 are connected with a first radio frequency input port through symmetrical leads, and the source electrodes of the M3 and the M4 are connected with a second radio frequency input port; drain electrodes of the M1 and the M3 are connected to serve as a first intermediate frequency output port, and drain electrodes of the M2 and the M4 are connected to serve as a second intermediate frequency output port. All grid, source and drain leads adopt the same type of metal; the intervals of the MOS tubes are equal, and the arrangement of radio frequency and intermediate frequency leads can eliminate phase errors. The signal processing capability of the mixer is effectively improved, and the stability and reliability of the system are enhanced.

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.