14results about "Modulation transference by diodes" patented technology

Disclosed is a sub-harmonic mixer module including a dielectric circuit unit and a ground conductor. The dielectric circuit unit includes a dielectric substrate, a first conversion probe, a second conversion probe, a nonlinear element, and an RF / DC ground circuit. The first conversion probe converts an RF electromagnetic wave into a first electrical signal. The second conversion probe converts an LO electromagnetic wave into a second electrical signal. The nonlinear element switches depending on the second electrical signal and generates a third electrical signal. The ground conductor is connected with the RF / DC ground circuit and provides ground voltage. The first conversion probe, the second conversion probe, the nonlinear element, and the RF / DC ground circuit are formed on one surface of the dielectric substrate. The ground conductor is disposed to make contact with the one surface of the dielectric substrate and is position-adjustable.

The invention relates to the technical field of terahertz photoelectric detection. A traditional terahertz frequency mixer generally adopts a semiconductor material with a low dielectric constant, the heat dissipation requirement of a high-frequency circuit is difficult to meet, the dielectric loss of a traditional substrate structure is remarkably increased along with the increase of the frequency of the frequency mixer, a large amount of energy loss is generated when a signal is transmitted in a micro-strip, and the transmission efficiency of a high-frequency signal is influenced; the invention provides a terahertz harmonic mixer structure of a hollow structure substrate and a preparation method thereof, a quartz substrate with a hollow structure is provided with a mixer circuit, the quartz substrate is arranged between a mixer upper cavity and a mixer lower cavity, and the quartz substrate is combined with a metal structure to realize transmission of terahertz signals. The thermal performance of the mixer is improved by the hollow structure, so that the mixer has better stability in a high-temperature environment, parasitic parameters are changed by modifying the structure of the quartz substrate, the impedance matching efficiency is improved, and the mixer is ensured to work stably and efficiently under the terahertz frequency.

Disclosed is an antenna-sub harmonic mixer block, which includes a dielectric block disposed on a PCB substrate having a ground surface, an antenna including first antenna patch provided on the dielectric block and having a metal patch and a slot, and a second antenna patch provided on the dielectric block, spaced apart from the first antenna patch to surround the first antenna patch, and that receives a ground voltage at the same potential as the ground surface of the PCB substrate, an RF ground wire disposed on the dielectric block and connected from the first antenna patch to a surface having the same potential as the ground surface, an RF switching stage disposed on the dielectric block, connected to the first antenna patch, and that provides a switching ON / OFF operation in conjunction with the RF ground wire depending on a magnitude of a local signal LO.

The invention discloses an ultra-wideband double-balanced mixer with a configurable working mode, aiming at the condition that the power difference between a local oscillator input signal and a radio frequency input signal is large, voltage transformation ratio baluns with different impedance transformation ratios are configured at two signal input ports, the port matching degree is good, and the frequency conversion loss is reduced; for the condition that the input impedance of a frequency mixing loop is different under different local oscillator input powers, two corresponding working modes can be selected according to the power of a local oscillator input signal, so that the frequency mixer can work at a lower local oscillator input power under the condition that a small amount of frequency conversion loss is increased, and the application range of the frequency mixer is widened; aiming at leakage of a local oscillator signal to a radio frequency port caused by factors such as non-ideal characteristics of a balun, inconsistency of devices, substrate coupling and the like, a two-stage balun with a center-tapped transformer structure is designed to be cascaded with the balun, so that an intermediate-frequency signal output tap is provided, and the isolation degree between a local oscillator port and the radio frequency port is enhanced.

A frequency mixer arrangement (300, 400, 500, 600) for receiving a first input signal (LOin) and a second input signal (IFin; RFin), for mixing the first and the second input signals to provide a frequency mixed signal (RFout; IFout), and for providing the frequency mixed signal as an output signal. The frequency mixer arrangement (300, 400, 500, 600) comprises: a first transistor (210), wherein the first transistor (210) is configured to receive the first and the second input signals at a control terminal (211) of the first transistor (210) and to mix the first and the second input signals to provide the frequency mixed signal from a current-sourcing terminal (213) of the first transistor (210), and wherein the first transistor (210) is configured to receive a first bias voltage (Vb1) at the control terminal (211) of the first transistor (210) and to receive a first supply voltage (Vcc1) at a current-collecting terminal (212) of the first transistor (210); and a diode (250), wherein an anode (251) of the diode (250) is galvanically connected to the current-sourcing terminal (213) of the first transistor (210) and a cathode (252) of the diode (250) is galvanically connected to ground, wherein the frequency mixer arrangement (300, 400, 500, 600) further comprises an inductive component (380) connected in series between the anode (251) of the diode (250) and the current-sourcing terminal (213) of the first transistor (210).

The invention belongs to the field of terahertz communication, relates to a frequency doubling and frequency mixing technology, and particularly provides a novel frequency doubling and frequency mixing multifunctional device based on a combined tube core, which is used for realizing function integration of a frequency mixer and a frequency multiplier. The invention creatively provides a Schottky diode arrangement group consisting of two Schottky diode pairs with a large tube core and a small tube core, namely a combined tube core; a multifunctional device is jointly formed by the terahertz wave multiplier serving as a core device, a radio frequency end waveguide, a radio frequency end waveguide-microstrip probe, a local oscillator filter, a local oscillator end waveguide-microstrip probe, a local oscillator end waveguide, an intermediate frequency filter and an intermediate frequency end, a frequency doubling working mode and a frequency mixing working mode are included, and integration of frequency doubling and frequency mixing functions in a terahertz wave band is successfully achieved. And more possible combination schemes are provided for later terahertz system architecture.

The invention discloses a radio frequency mixer integrated with an adaptive adjustment function, which belongs to the technical field of electronic circuits and comprises a waveguide main body, an integrated mixer component, an embedded parasitic compensation network and an adaptive control unit. The inner wall of the waveguide main body is provided with an annular groove, and the cylindrical shielding case is embedded in the groove to enable the inner surface of the cylindrical shielding case to be coplanar with the inner wall of the waveguide, thereby eliminating the projection problem of a conventional shielding case. The mixing diode is accurately installed on the microstrip substrate at the bottom of the groove, and the distance between the two components is set to be odd times of the half-wavelength of a local oscillator signal. And the embedded parasitic compensation network adopts a three-dimensional spiral capacitor structure and is connected with the mixing diode through a micro grounding through hole. The adaptive control unit monitors performance indexes in real time through a sensor, and dynamically adjusts the position of the movable short-circuit end and the bias voltage of the diode by using a gradient algorithm. According to the invention, the problem of high-band phase mismatch is solved, and the conversion efficiency, isolation and linearity are significantly improved.

The application discloses a radio frequency mixer integrated with self-adaptive adjusting function and belongs to the technical field of electronic circuits, comprising: the mixer comprises a waveguide main body, an integrated mixer assembly, an embedded parasitic compensation network and a self-adaptive control unit. The inner wall of the waveguide main body is provided with an annular groove, and a cylindrical shielding cover is embedded in the groove so that the inner surface of the shielding cover is coplanar with the inner wall of the waveguide, and the protrusion problem of the traditional shielding cover is eliminated. The mixing diode is accurately installed on the microstrip substrate at the bottom of the groove, and the distance between the two components is set to the odd multiple of the half wavelength of the local oscillator signal. The embedded parasitic compensation network adopts a three-dimensional spiral capacitor structure and is connected with the mixing diode through a micro ground via. The self-adaptive control unit monitors the performance index in real time through a sensor and dynamically adjusts the position of the movable short-circuit end and the diode bias by using a gradient algorithm. The application solves the problem of phase mismatch in the high-frequency band and significantly improves the conversion efficiency, isolation and linearity.

The invention discloses a variable capacitance characteristic-based high-precision frequency mixing circuit, which comprises an input matching module, a choke filtering module, a power divider and n frequency mixing branches which are connected in sequence, and is characterized in that each frequency mixing branch has the same structure and comprises a frequency selection network, a field effect transistor MOSi, an inductor Li, a high-pass filtering module and an output matching module. Impedance matching and phase modulation are carried out on an input signal through the input matching module, then the input signal enters the choke filtering module to be filtered, then the input signal is equally divided into n input signals through the power divider, the n input signals enter the frequency mixing branch to be subjected to frequency mixing output, n output signals with higher frequency are obtained, and weighted output is carried out according to the selection frequency of the frequency selection network part. And a final more accurate result is obtained. According to the invention, a more accurate signal frequency mixing effect can be realized, and the device has the characteristics of simple structure, low noise coefficient, low cost and low power consumption, and has a wide application prospect in the transmitting, receiving and processing directions of electric wave signals.

The invention relates to the technical field of carrier modulation, and discloses an adjustable carrier mixing modulation method and system, and the method comprises the steps: obtaining a first change rate of a target modulation wave under a first working condition, and carrying out the first division operation of the first change rate; obtaining a first change rate of the target modulation wave under the real-time working condition, and determining a first target carrier frequency according to the first division operation result; and presetting a first constraint, and carrying out carrier frequency mixing modulation based on the first constraint in combination with the first target carrier frequency. According to the invention, the dynamic adjustment of the carrier frequency can be realized, and the optimal carrier frequency is determined according to the change rate of the modulated wave, so that unnecessary switching operation is reduced, switching loss is reduced, and the overall efficiency of the system is improved. Meanwhile, through preset constraint conditions, the system can also ensure the quality of the output waveform, the harmonic content of the three-phase voltage and the three-phase current is controlled within a target range, and the actual application requirement is met.

The objective is to provide an orthogonal mixer that has the function to perform distortion compensation independently on each of its two unit mixers. [Solution] A quadrature mixer comprising first and second unit mixers that use the mth order (m is a natural number) of the LO wave as a carrier wave, having an LO distribution unit that equally distributes the LO wave and outputs it to the first and second unit mixers with a phase difference of π / 2m, having a power combining unit that combines the output wave from the first unit mixer and the output wave from the second unit mixer, having a first compensation signal generation unit that generates a compensation signal to be input to the first unit mixer based on the quadrature transmission signal or its information, and a second compensation signal generation unit that generates a compensation signal to be input to the second unit mixer.

To provide a superheterodyne wireless communication device which suppresses the DC offset component generated in the intermediate frequency signal due to self-mixing, without removing the signal component.SOLUTION: The device includes a mixer that mixes a radio frequency signal and a local oscillator signal to output an intermediate frequency signal. Based on the DC voltage output from the mixer when the radio frequency signal is not supplied and the local oscillator signal is supplied to the mixer, the level of the DC component contained in the intermediate frequency signal is corrected.SELECTED DRAWING: Figure 4

The invention discloses a frequency mixer based on a variable capacitance diode and electronic equipment, and belongs to the technical field of communication. The mixer comprises a diode bridge, a band-pass filter, a Balun balancer and a resonance unit. The diode bridge is used for converting the pumping signal into a strongly nonlinear signal under a given reverse bias voltage state and then mixing the strongly nonlinear signal with an input signal; the band-pass filter is used for filtering the pumping signal and the input signal; the balun balancer is used for converting a pumping signal from a single-end signal to a double-end signal, and the balun balancer and the diode bridge jointly suppress signals of other frequencies except the pumping signal; and the resonance unit is used for opening the signal frequency and short-circuiting the output frequency. According to the mixer, the effects of high conversion gain and low noise coefficient of an output signal are achieved through the parametric amplification principle, and the defect that gain and noise of a traditional mixer cannot be considered at the same time is overcome.

Devices and methods for a detection system and heterodyne mixer having a local oscillator (LO) input, a radio frequency (RF) input, an intermediate frequency (IF) output, and a suspended waveguide structure that has a quartz substrate and patterned metal transmission line with a plurality of suppression slots.