13results about "Modulation transference balanced arrangements" patented technology

This invention relates to a ground-based analog frequency conversion system for satellite payloads and its implementation method. The system includes: a filtering and coupling module for receiving high-frequency signals in the Q and V bands and splitting them into a coupling signal and a main signal, which are then transmitted to a detector module and a limiter, respectively. The detector module detects the power of the coupling signal at different temperatures and feeds it back to the control module. The limiter limits the maximum strength of the main signal to protect the low-noise amplifier (LNO). The LNO amplifies the main signal and reduces noise. A phase-locked loop (PLL) and frequency conversion module down-converts the high-frequency signal to an intermediate-frequency (IF) signal. An IF filtering and amplification module suppresses spurious interference and amplifies the IF signal. A temperature compensation module and a gain control module adjust the attenuation value to achieve temperature compensation and ensure that the IF output signal strength meets preset requirements. All modules are integrated using micro-assembly technology. This system can reduce the power consumption and cost of satellite launch and communication.

This disclosure provides systems, methods, and devices for wireless communication that support reconfiguring degeneration components in a converged RF transceiver supporting carrier aggregation across sub-6 GHz frequency bands and mmWave frequency bands. In a first aspect, an apparatus includes an input port configured to receive a mixer input signal; a first mixer forming at least a portion of an HRM mixer and coupled to the input port; a first configurable degeneration component of a first processing path coupled between the input port and the first mixer; and a controller coupled to the first degeneration component, wherein the controller is configured to control a first aspect of a first degeneration component. Other aspects and features are also claimed and described.

This invention discloses a four-quadrant analog multiplier circuit, comprising: a Gilbert cell circuit, a first active attenuation circuit, and a second active attenuation circuit; the first input terminal of the Gilbert cell circuit is connected to the output terminal of the active attenuation circuit, and the second input terminal of the Gilbert cell circuit is connected to the output terminal of the second active attenuation circuit; a first signal is input to the first active attenuation circuit; a second signal is input to the second active attenuation circuit; the first and second active attenuation circuits attenuate the input signal and then perform level shifting, so that the Gilbert cell circuit operates in the saturation region. By reducing the number of transistors between the positive and negative power supplies, the minimum operating voltage is lowered, thereby reducing power consumption; furthermore, the simultaneous use of active attenuation circuits to process the input signal effectively expands the linear operating region.

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.

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.

An electronic device may include wireless circuitry having a radio-frequency mixer. The mixer may include an input stage, an output stage, and a transformer coupled between the input and output stages. The input stage may include input transistors forming a transconductance cell. The output stage may include two pairs of mixer transistors configured to receive an oscillating signal. The transformer may include a primary coil coupled between the input transistors and a secondary coil coupled between the two pairs of mixer transistors. A harmonic rejection circuit may be coupled to a center tap of the secondary coil. The harmonic rejection circuit may be configured to mitigate harmonic signals that are associated with the oscillating signal and that are generated at the inputs of the output stage. The harmonic rejection circuit may include an inductor, an optional capacitor, an optional current source transistor, or other passive component.

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.

This application discloses an equalizer circuit. The equalizer circuit includes a current source module, an RC network, and a differential transistor pair. The current source module is electrically connected to the RC network, and the RC network is electrically connected to the differential transistor pair. The equalizer circuit also includes: an adjustable active inductor module, electrically connected to the first and second transistors in the differential transistor pair; and a control module, electrically connected to the current source module, the RC network, and the adjustable active inductor module, used to change the frequencies of the dominant and secondary poles of the equalizer circuit by adjusting the performance parameters of the current source module, the RC network, and the adjustable active inductor module. The above equalizer circuit can obtain compensation curves for peak values ​​at different frequency points, effectively solving channel compensation problems under different protocols and data rates. It solves the problem in related technologies where the equalizer needs to compensate for different channel attenuations under different protocols and data rates, making it impossible to achieve adjustable gain enhancement within 0-15dB for each frequency peak.

A transmitter mixer circuit is provided for reducing local oscillator leakage. The transmitter mixer circuit (100) includes a double-balanced transmitter mixer comprising two branches. Furthermore, the first branch of the two branches includes a first calibration current source (I00). P ) and the first calibration capacitor (C P Furthermore, the first calibration capacitor (C) P Grounding, the second branch of the two branches includes a second calibration current source (I) N ) and second calibration capacitor (C N Additionally, the transmit mixer circuit (100) is used to: based on the first calibration capacitor (C) P ) and the second calibration capacitor (C N The capacitor of ) and the first calibration current source (I) P ) and the second calibration current source (I N The output of the transmitter mixer (100) is used to calibrate the double-balanced transmitter mixer (102). The transmitter mixer circuit (100) performs two-dimensional calibration, that is, adjusting the amplitude difference and phase difference between the LO leakage currents to reduce the overall LO leakage.

Circuitry (24) is provided that includes a matching circuit (100), a first mixer (50-1) coupled to the matching circuit and configured to receive a signal with an oscillation frequency, a second mixer (50-2) coupled to the matching circuit, a first transmission line path (102-1) coupled between the matching circuit (100) and an input of the first mixer (50-1), and one or more capacitors (104) coupled to the input of the first mixer (50-1) and configured to reject signals at a harmonic frequency of the oscillation frequency. The wireless circuitry (24) can further include a second transmission line path (102-2) coupled between the matching circuit (100) and an input of the second mixer (50-2). The transmission line path can include a first transmission line for conveying signals between the matching circuit (100) and the first mixer (50-1), a second transmission line for conveying signals between the matching circuit (100) and the first mixer (50-1), and a floating transmission line interposed between the first and second transmission lines.

This application provides a frequency mixer and a signal transmission device, relating to the field of communication technologies. In the solution provided in this application, the frequency mixer can transmit a local oscillator signal through a slot line, and transmit a first signal, a second signal, and a third signal through microstrips. Therefore, it can be ensured that a transmission mode of the local oscillator signal is different from a transmission mode of the first signal, and different from transmission modes of the second signal and the third signal. In other words, isolation between the transmission mode of the local oscillator signal and the transmission mode of the first signal, and isolation between the transmission mode of the local oscillator signal and the transmission modes of the second signal and the third signal can be achieved. Owing to the isolation between the transmission mode of the local oscillator signal and the transmission modes of other signals, local oscillator signal leakage on other signal ports can be effectively reduced, thereby effectively improving performance of the frequency mixer.