78results about "Modulation transference by semiconductor devices with minimum 2 electrodes" patented technology

The invention provides an oscillator frequency modulation circuit and a communication chip. The oscillator frequency modulation circuit comprises a first resonance area which comprises a first resonance circuit, a first coupling tube (Mn) and a second coupling tube (Mp), wherein the first coupling tube (Mn) and the second coupling tube (Mp) are cross-coupled with the first resonance circuit; the second resonance area comprises a second resonance circuit, and the second resonance circuit comprises a first branch circuit electrically connected with the first coupling tube (Mn) and a second branch circuit electrically connected with the second coupling tube (Mn); the second branch is electrically connected with the second coupling tube (Mp); the first tail inductor (Ln) is connected to the first branch in series; the second tail inductor (Lp) is connected in series with the second branch; and the differential capacitor array (Ct) is connected between the first branch circuit and the second branch circuit in parallel. According to the oscillator frequency modulation circuit and the communication chip, low noise can be realized in a broadband range, the anti-interference capability is realized, meanwhile, the occupied area is relatively small, and high-quality signals can be continuously output for a multi-protocol system.

The invention discloses a frequency source synthesis system and method based on a frequency agility radar, and belongs to the technical field of microwave radio frequency, and the method specifically comprises the steps: generating a target clock signal, carrying out the frequency processing of the target clock signal to generate a frequency multiplication signal, and dividing the frequency multiplication signal into two clock signals through a power divider; performing frequency multiplication processing on one path of clock signal, taking the processed signal as a clock reference signal of a direct digital synthesizer, generating an analog signal according to the clock reference signal, and calibrating the analog signal as an output signal; performing frequency multiplication processing on the other path of clock signal, and taking the processed clock signal as a local oscillation signal of the frequency mixer; performing frequency conversion processing to obtain a frequency mixing signal, performing quadruplicated frequency processing on the frequency mixing signal, and calibrating the processed frequency mixing signal as a final output signal; according to the invention, the frequency source has the characteristics of low phase noise, rapid agility, fine resolution and miniaturization at the same time.

The invention discloses a wireless direction finder circuit and a wireless direction finder, and relates to the technical field of wireless direction finding. Wherein the wireless direction finder circuit comprises a local oscillation signal input end, a frequency mixing detection circuit, a rectifying circuit, a main control circuit and an inflexion output circuit. The frequency mixing detection circuit generates a frequency mixing signal according to the wireless signal and the local oscillator signal. The rectifying circuit converts the frequency mixing signal into a first direct current signal. And the main control circuit outputs an inflexion control signal when the voltage value of the first direct current signal is greater than or equal to a preset voltage value. When the inflexion output circuit does not receive the inflexion control signal, the inflexion output circuit outputs a corresponding first audio signal according to the frequency mixing signal; and when the inflexion control signal is received, the second audio signal of frequency conversion is output according to the inflexion control signal and the frequency mixing signal, so that a user can be prompted that the signal intensity is relatively high at the moment and the signal source has entered the preset distance range. According to the invention, positioning is assisted through a dual change mechanism of tone and volume, so that positioning efficiency and environmental adaptability are improved.

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

In an example, a system includes a receiver configured to receive a differential input signal from a quadrature amplitude modulation (QAM) transmitter at a differential interface that includes a first input and a second input. The system also includes a first switch coupled to the first input and a second switch coupled to the second input, where the first switch and second switch are configured to couple the first input and the second input to a complex mixer in a non-inverting configuration. The system includes a third switch coupled to the first input and a fourth switch coupled to the second input, where the third switch and the fourth switch are configured to couple the first input and the second input to the complex mixer in an inverting configuration. The complex mixer is configured to produce an output signal based on the non-inverting configuration and the inverting configuration.

Mixer circuitry can include a first pair of transistors coupled to a first tail node and configured to receive a local oscillator signal, a second pair of transistors coupled to a second tail node and configured to receive the local oscillator signal, a first digital-to-analog converter, a second DAC coupled between the first DAC and of the first pair of transistors, and a third DAC coupled between the first DAC and the second pair of transistors. During a first phase, control circuitry can sweep the first DAC to trim a first and / or other odd order local oscillator feedthrough. During a second phase, the control circuitry can sweep the second DAC to trim a second and / or other even order local oscillator feedthrough. During a third phase, the control circuitry can sweep the second and third DACs to reject signals associated with a second harmonic conversion gain of the mixer circuitry.

Mixer circuitry can include a first pair of transistors coupled to a first tail node and configured to receive a local oscillator signal, a second pair of transistors coupled to a second tail node and configured to receive the local oscillator signal, a first digital-to-analog converter, a second DAC coupled between the first DAC and of the first pair of transistors, and a third DAC coupled between the first DAC and the second pair of transistors. During a first phase, control circuitry can sweep the first DAC to trim a first and / or other odd order local oscillator feedthrough. During a second phase, the control circuitry can sweep the second DAC to trim a second and / or other even order local oscillator feedthrough. During a third phase, the control circuitry can sweep the second and third DACs to reject signals associated with a second harmonic conversion gain of the mixer circuitry.

Disclosed are example embodiments of harmonic mixer. The harmonic mixer including a multi-phase LO signal generator. Each phase of the multi-phase LO signal generator outputting an LO signal on a signal line. The harmonic mixer including a plurality of mixers. Each mixer of the plurality of mixers connected to a signal line. The mixer driven by an IF. The harmonic mixer including an output network coupled to the outputs of the plurality of mixers.

In one example, an RF oscillator system includes a laser source configured to emit laser light, a housing, a crystalline microresonator disposed within the housing, and a photonic integrated circuit disposed within the housing, the photonic integrated circuit including an optical waveguide network and configured to generate a clock signal based on the laser light. The RF oscillator system may further include at least one photonic wirebond configured to couple the laser light between the optical waveguide network and the crystalline microresonator via evanescent coupling; laser control circuitry disposed within the housing and configured to lock a frequency of the laser light to a resonance of the microresonator to generate the clock signal; and a direct digital synthesizer disposed within the housing and configured to produce a tunable oscillator signal based on the clock signal.

Certain aspects provide a circuit for frequency translation. The circuit includes first mixer circuitry coupled to a load circuit and having a first mixer configured to generate, based on a first differential input signal and a second differential input signal, a first portion of a frequency translated differential signal to be provided to the load circuit, and a second mixer configured to generate, based on a third differential input signal and a fourth differential input signal, a second portion of the frequency translated differential signal. The circuit also includes second mixer circuitry coupled to another load circuit and having a third mixer configured to generate, based on the first differential input signal and the fourth differential input signal, a first portion of another frequency translated differential signal, and a fourth mixer configured to generate, based on the third differential input signal and the second differential input signal, a second portion of the another frequency translated differential signal.

A device for generating a qubit control signal comprises: a first signal envelope generator circuit comprising a first plurality of signal sources, wherein an output of each of the first plurality of signal sources is combined to provide a first cumulative output; and a first mixer circuit coupled to the first signal envelope generator circuit, wherein the first cumulative output is coupled to a first input of the first mixer circuit, and an output of the first mixer circuit comprises a first qubit control signal.

The present disclosure relates to compensating for temperature variation of a mixer. Embodiments herein may include the mixer, a calibration circuit coupled to the mixer, a replica mixer circuit coupled to the calibration circuit, and a temperature compensation circuit coupled to the calibration circuit. The replica mixer circuit may generate or be used to generate a reference voltage that varies with a common mode voltage and / or a threshold voltage of a replica mixer. The reference voltage may be applied to a resistor ladder of the calibration circuit to adjust a bias voltage and compensate for temperature variations. Further, the temperature compensation circuit may generate a temperature coefficient that may be applied to a current going through the calibration circuit to facilitate compensating for temperature variation.

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.

A passive mixer circuit includes a high-frequency terminal, a low-frequency terminal, a main MOSFET to which a local oscillation frequency signal is input, and a bias generation section, in which the bias generation section includes a sub-MOSFET of a same type as the main MOSFET, a voltage follower circuit including an operational amplifier, and a resistance element, a drain and a gate of the sub-MOSFET are shorted and directly or indirectly receive an output from the voltage follower circuit, a reference voltage is input to a non-inverting input terminal of the operational amplifier, a gate bias voltage based on a gate voltage of the sub-MOSFET is supplied to a gate of the main MOSFET, and a source-drain bias voltage based on a source voltage of the sub-MOSFET is supplied to a source or a drain of the main MOSFET.

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.

The invention provides a digital signal processing chip which can be applied to the technical field of information processing. The signal processing chip comprises an orthogonal mixer used for converting an input signal into a baseband signal; the finite impulse response filter is used for filtering noise; the parameter generator is used for generating extraction algorithm parameters according to the input previous frame target information; the point extractor is used for compressing signal points in a time domain according to the parameters generated by the parameter generator; and the on-chip memory is used for storing the operation process data and the parameter data. The processor can extract needed fragments from input signals through existing target information, a one-dimensional digital signal processing flow is completed, and compared with a traditional digital signal processor, the processor has the advantages that invalid calculation is avoided, the parallel efficiency is high, and the configurability is high.

Methods and apparatus for calibration of a second-order input intercept point (IIP2) of a mixer, such as a mixer in a wireless receive chain. One example circuit for mixer IIP2 calibration generally includes a first receive chain comprising a first mixer and a single tone generator having an output coupled to an input of the first mixer and configured to generate a calibration signal having a single baseband tone. One example method of mixer IIP2 calibration generally includes generating a calibration signal comprising a single baseband tone, applying the calibration signal to an input of a mixer, such that the mixer generates a differential tone at an output of the mixer, and adjusting the mixer to minimize a power of the differential tone at the output of the mixer.

A receiver circuit comprises a local oscillator (LO) signal generator that provides LO reference voltage signals, and a plurality of up-conversion paths that provide filtered up-converted signals. Each up-conversion path comprises a transistor and a bandpass filter. A drain of the transistor provides a mixed signal in response to one of the LO reference voltage signals at a gate of the transistor and an RF input signal at a source of the transistor. The bandpass filter has a fixed frequency that passes a first frequency component associated with a center frequency of the RF input signal and rejects a second frequency component associated with an undesired frequency in the mixed signal to provide one of the filtered up-converted signals. The fixed bandpass frequency may reject a plurality of second frequency components that are associated with a plurality of undesired frequencies of the RF input signal.

In certain aspects, an apparatus includes a transformer including an input inductor and an output inductor, wherein the input inductor is magnetically coupled to the output inductor. The apparatus also includes a transconductance driver configured to drive the input inductor based on an input signal. The apparatus further includes a feedback circuit configured to detect an output voltage swing at the output inductor, generate a regulated voltage at the input inductor, and control the regulated voltage based on the detected output voltage swing.

A radio-frequency modulator apparatus comprises a baseband stage, a mixer stage and a radio-frequency stage. The baseband stage comprises: an input line for receiving an input current representative of a baseband input signal, a baseband transistor that passes some or all of the input current between a first and a second terminal thereof, an electrical connection between the input line and a control terminal of the baseband transistor, and an output line connected to said control terminal. The mixer stage receives a signal from the baseband stage and mixes it with a radio-frequency local-oscillator signal to generate a radio-frequency mixed signal. The radio-frequency stage receives the radio-frequency mixed signal, applies the radio-frequency mixed signal to a control terminal of a radio-frequency transistor causing it to pass a radio-frequency output current between a first and a second terminal thereof, and outputs the radio-frequency output current as an output signal.

The mixer-first topology of receivers do not include low-noise amplifiers (LNA) preceding the mixer. The Mixer-First topology of radio receivers utilizes a direct-conversion quadrature mixer to down convert an RF signal to baseband, where a Hilbert Transform filter is used for sideband selection. When a switching mixer is used, the mixer-first receiver is capable of extremely high dynamic range and linearity. The downfall of the mixer-first topology is poor out-of-band signal rejection. A mixer-first receiver is described which achieves third-harmonic rejection without bandpass filtering proceeding the mixer.

Provided is a reception apparatus that includes an in-phase-side mixer that mixes a high-frequency component and an in-phase-side local signal, and outputs the mixed signal as an in-phase-side mixed signal, a quadrature-side mixer that mixes the high-frequency component and a quadrature-side local signal orthogonal to the in-phase-side local signal, and outputs the mixed signal as a quadrature-side mixed signal, an error detection signal generation unit that generates four-phase detection signals having same frequencies as frequencies of the in-phase-side local signal and quadrature-side local signal, and each having a different phase, and a signal processing unit that generates a gain difference between an in-phase-side signal according to the in-phase-side mixed signal and a quadrature-side signal according to the quadrature-side mixed signal, on the basis of respective output signals of the in-phase-side mixer and quadrature-side mixer in a case where each of the four-phase detection signals is the high-frequency component.

The invention discloses a frequency mixer, which is characterized by comprising a first transistor; a second transistor; a third transistor; a first connection point for connecting to a gate terminal of the first transistor, a drain terminal of the second transistor, and a source terminal of the third transistor; a second connection point for connecting to a source terminal of the first transistor and a gate terminal of the second transistor; and a third connection point for connecting to the drain terminal of the first transistor and the drain terminal of the third transistor.

An electronic device may include wireless circuitry with a mixer. The mixer may include a transconductor with first and second input transistors, a switching quad with first and second pairs of mixer transistors, and a transformer coupled between the transconductor and the switching quad. The transformer may have a primary winding and a secondary winding. The transformer may have a conductive path that couples a center tap contact of the primary winding to a center tap contact of the secondary winding. The conductive path may configure the transformer to share a DC bias current between the transconductor and the switching quad. This may eliminate the need to bias the transconductor and the switching quad using different power supply voltages, thereby minimizing power consumption without sacrificing performance.

A module for modulation and demodulation using two substantially identical self-oscillating mixers (SOMs) injection-locked at a coupling frequency, providing a simple compact, low power, highly efficient receiver, transmitter or transceiver. The module suitable for quadrature amplitude-modulation where the coupling frequency is the second harmonic frequency of the SOMs and the SOMs oscillate 180 degrees out of phase relative to one another. Use of carrier frequencies at a fundamental harmonic frequency or odd multiples thereof provide high isolation between the SOMs at the carrier frequency. A method for modulation and demodulation includes injection-locking the two SOMs at a coupling frequency.

The invention relates to the technical field of frequency conversion components, in particular to a dual-band amplitude-phase consistent frequency conversion component which comprises a first amplitude limiter, a first switch and a first frequency mixer, the first amplitude limiter is connected with the first switch, the first switch is connected with the first frequency mixer through a switch filter bank, and the first frequency mixer is connected with a fifth switch; the switch filter bank comprises a second switch and a third switch, the second switch is connected with a first band-pass filter, a third band-pass filter and a fifth band-pass filter, the first band-pass filter is connected with the third switch through a first amplifier and a second band-pass filter, and the third band-pass filter is connected with the third switch through a second amplifier and a fourth band-pass filter. The fifth band-pass filter is connected with a third switch through a third amplifier and a sixth band-pass filter; the four-way frequency conversion part is powered on and powered off through the power switch, the frequency conversion part which does not need to be used can be independently powered off through external control according to the actual use condition, and unnecessary power consumption is avoided.

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.

A communication system comprising a passive quadrature generator directly connected to an in-phase (I) mixer and a quadrature (Q) mixer; an I-LO amplitude detection circuit connected to the passive quadrature generator and connected to the I-mixer, and a Q-LO amplitude detection circuit connected to the passive quadrature generator and connected to the Q-mixer, the I-LO amplitude detection circuit configured to detect an I-LO amplitude, and the Q-LO amplitude detection circuit configured to detect a Q-LO amplitude; and a combining and integrating circuit configured to receive the detected I-LO amplitude and the detected Q-LO amplitude, and to generate an I-LO DC bias voltage for biasing the I mixer and a Q-LO DC bias voltage for biasing the Q mixer.

Embodiments disclose an apparatus for generating radio frequency signals in phase quadrature. The integrated electronic device includes a mixer module comprising a voltage / current transconductance stage including a first transistor and connected to a mixing stage including a second transistor, wherein the mixing stage includes: a resistance degeneration circuit connected to the source of the second transistor; and a calibration input connected to the gate of the second transistor and intended to receive an adjustable calibration voltage, and the source of the first transistor is directly connected to a cold power supply point.