16results about "Simultaneous amplitude and angle modulation" patented technology

A generator with a regeneration device. The electrosurgical generator according to the invention includes an oscillating circuit excited by means of an excitation circuit having a frequency preferably close to its resonant frequency, wherein the oscillation should be periodically interrupted. This can be done, for example, in situations where a pulse-pause modulation of a radio frequency voltage must be created, the fundamental frequency of which, for example, 350 kHz or 500 kHz, can be modulated with a modulation frequency of, for example, 50 kHz. To stop the oscillation in the generator's oscillating circuit as abruptly as possible without losing the energy stored in the oscillating circuit, a regeneration circuit is provided, implemented by means of a voltage multiplier circuit. Compared to a boost converter coupled inductor, it has the advantage of providing a low capacitive load to the oscillating circuit, especially because it is only electrically effectively connected to the oscillating circuit via a switch during the regeneration phase. This concept allows for efficient energy regeneration and therefore allows for precise amplitude modulation of the radio frequency voltage, particularly square wave modulation (on-off-switch).

Frequency spectrum data of a segment of an input audio signal is converted from complex number form having a high bit count real and imaginary parts to polar coordinate form having a lower bit count angles and amplitudes. The frequency spectrum of the segment of the input audio signal is stored in the polar coordinate form. Storing the frequency spectrum of the segment of the input signal in polar coordinate form requires fewer bits than storing the frequency spectrum data of the segment of the input signal in complex number form.

The present invention discloses an intermediate frequency digital power amplifier modulator applied to amplitude and phase modulation, comprising: a high-speed ADC, a data buffer module, an envelope elimination module, a phase lag module, an envelope extraction module and an SPWM modulation module. The input end of the high-speed ADC is connected to the signal source of the front-stage communication system, the output end of the high-speed ADC is connected to the input end of the data buffer module, the output end of the data buffer module is respectively connected to the input end of the envelope elimination module and the input end of the envelope extraction module, the output end of the envelope elimination module is connected to the input end of the phase lag module, the output end of the phase lag module serves as the PWM driving signal for the subsequent-stage circuit, the output end of the envelope extraction module is connected to the input end of the SPWM modulation module, and the output end of the SPWM modulation module serves as the SPWM driving signal for the subsequent-stage circuit. The present invention is applicable to high-power intermediate frequency transmitter systems, enabling the power amplifier unit to use a fully digital topology, greatly improving the efficiency of the system and reducing the volume.

The invention provides an electronic device and equipment, the electronic device comprises a first accumulator and N filtering modules, each filtering module in the N filtering modules comprises a plurality of branches, each branch in the plurality of branches comprises a phase adjusting unit and an amplitude adjusting unit which are coupled, and the output end of each filtering module is coupled with the first accumulator. For the first filtering module in the N filtering modules, the input end of the phase adjusting unit in the first filtering module is coupled with the input end of the electronic device; and for the ith filtering module in the N filtering modules, the input end of the phase adjusting unit in the ith filtering module is coupled with the output end of the phase adjusting unit in the (i-1) th filtering module. Thus, with the addition of the filtering modules, finer amplitude-phase adjustment can be realized, and thus the amplitude-phase equalization capability of the electronic device is improved.

The present electronic generator of modulated subcarrier pulse signals includes a module for modulating a pulse train, the position and amplitude of which are controllable, forming a switching signal; a switching module, connected to the output of the module for modulating the pulse train, including at least one transistor, controlled by the switching signal, a voltage-controlled frequency-locking oscillator having a frequency-locking band around a free oscillation frequency controlled by a control voltage, connected to the output of the switching module, the switching module making possible the injection of a periodic pulse signal having a frequency spectrum including at least one frequency line within the frequency locking band. Such arrangement makes it possible to obtain, at the output of the oscillator, frequency-controlled, phase-controlled and amplitude-controlled modulated subcarrier pulsed signals.

The application discloses a 1 / f noise suppression method for a particle detection system and a related device, and belongs to the field of photoelectric signal detection. The method comprises the following steps: acquiring a low-frequency voltage signal scattered by particles and a high-frequency carrier; mixing the low-frequency voltage signal based on the high-frequency carrier, shifting the frequency spectrum of the low-frequency voltage signal from low frequency to high frequency to suppress 1 / f noise, and then sequentially performing band-pass filtering and amplification to obtain a high-frequency voltage signal; and after sampling the high-frequency voltage signal through an analog-to-digital converter, mixing the high-frequency voltage signal with a first quadrature carrier generated by a local oscillator and performing low-pass filtering to synthesize a baseband signal. The application can suppress 1 / f noise and solve the problem of 1 / f noise reducing the signal-to-noise ratio of a micro-particle signal.

A digital polar transmitter with improved transmission behavior is provided. The digital polar transmitter comprises a first modulating unit with a first variable gain being controllable with the aid of a first phase-referred signal, a second modulating unit with a second variable gain being controllable with the aid of second phase-referred signal, a third modulating unit, especially an amplitude modulating unit, with a third variable gain being controllable with the aid of an amplitude-referred signal, and an adding unit for forming the sum of an output of the first modulating unit and an output of the second modulating unit and providing the sum at an adding unit output. In this context, the first phase-referred signal and the second phase-referred signal are synchronized. In addition to this, the amplitude-referred signal is synchronized with respect to the first phase-referred signal and / or the second phase-referred signal.

The invention discloses a 1 / f noise suppression method for a particle detection system and a related device, and belongs to the field of photoelectric signal detection.The method comprises the following steps that low-frequency voltage signals scattered by particles and high-frequency carrier waves are obtained; performing frequency mixing on the low-frequency voltage signal based on the high-frequency carrier, moving the frequency spectrum of the low-frequency voltage signal from low frequency to high frequency to suppress 1 / f noise, and then performing band-pass filtering and amplification in sequence to obtain a high-frequency voltage signal; and after the high-frequency voltage signal is sampled by the analog-to-digital converter, mixing and low-pass filtering are carried out on the high-frequency voltage signal and a first orthogonal carrier generated by the local oscillator, and a baseband signal is obtained through synthesis. According to the invention, 1 / f noise can be suppressed, and the problem that the 1 / f noise reduces the signal-to-noise ratio of a microparticle signal is solved.

According to an example aspect of the present disclosure, there is provided a method for transmitting a Discrete Fourier Transform-spread-Orthogonal Frequency Domain Multiplexed. DFT-s-OFDM, signal, the method comprising, converting, by a wireless transmitter, complex-valued symbols to polar domain symbols, wherein the complex-valued symbols are modulated using at least phase shift keying, processing, by the wireless transmitter, angle values of the polar domain symbols to avoid angle differences larger than π rad, or lower than −π rad, between consecutive angle values, interpolating, by the wireless transmitter, at least the processed angle values by an interpolation factor N / L, wherein L is a length of Fast Fourier Transform, FFT, and Nis length of Inverse FFT, IFFT, converting, by the wireless transmitter, the interpolated angle values into complex domain symbols and generating, by the wireless transmitter, a DFT-s-OFDM waveform comprising said complex domain symbols.

An N-tap resistor network circuit is provided with a plurality of first resistors and a plurality of first taps, and generates a control voltage having one of a plurality of predetermined voltage values by selecting one of the plurality of first taps in accordance with an inputted digital control signal. An M-tap resistor network circuit is provided with a plurality of second resistors and a plurality of second taps, and generates a plurality of predetermined reference voltages at the plurality of second taps. Each of folding circuits generates an output signal based on differences between the control voltage and the plurality of reference voltages, the output signal having a signal level corresponding to a predetermined phase of a sine wave or a cosine wave.

The invention provides an amplitude modulation and phase modulation signal generation method based on a saturation power amplifier. The amplitude modulation and phase modulation signal generation method comprises the steps of generating four paths of baseband signals; the four paths of baseband signals are subjected to up-conversion to generate four paths of radio frequency signals; four paths of power radio frequency signals are generated after the four paths of radio frequency signals are respectively subjected to saturation power amplification; the four paths of power radio frequency signals are synthesized into one path of synthesized signal; and the synthesized signal sequentially passes through the attenuator and the down-conversion module and then enters the intermediate frequency sampling module for verification. According to the method, in a multifunctional integrated system of a radio frequency system, a saturation power amplifier of a conventional detection system can be used for generating amplitude modulation and phase modulation signals required by a communication function, and no extra equipment needs to be added; compared with an existing communication amplitude modulation and phase modulation signal generation method, the method can achieve larger EIRP.

A digital polar transmitter (10) with improved transmission behavior is provided. Said digital polar transmitter (10) comprises a first modulating unit (11a) with a first variable gain being controllable with the aid of a first phase-referred signal (α(t)), a second modulating unit (11b) with a second variable gain being controllable with the aid of second phase-referred signal (β(t)), a third modulating unit (14), especially an amplitude modulating unit, with a third variable gain being controllable with the aid of an amplitude-referred signal (γ(t)), and an adding unit (12) for forming the sum of an output of the first modulating unit (11a) and an output of the second modulating unit (11b) and providing said sum at an adding unit output. In this context, the first phase-referred signal (α(t)) and the second phase-referred signal (β(t)) are synchronized. In addition to this, the amplitude-referred signal (γ(t)) is synchronized with respect to the first phase-referred signal (α(t)) and / or the second phase-referred signal (β(t)).

The invention relates to a switched mode power amplifier with ideal IQ combination. An I converter (502) outputs I symbol data and I magnitude data based on received I data. A Q converter (504) outputs Q symbol data and Q magnitude data based on received Q data. An I-clock (404) generates an I-phase based on the I-symbol data. A Q clock (406) generates a Q phase based on the Q symbol data. An I modulator (514) generates an I magnitude pulse stream based on the I magnitude data. A Q modulator (516) generates a Q magnitude pulse stream based on the Q magnitude data. A digital logic component (518) generates an output signal based on the I-phase, the I-magnitude pulse stream, the Q-phase, and the Q-magnitude pulse stream. A power amplifier (526) generates an amplified signal based on the output signal.

An N-tap resistor network circuit (11) is provided with a plurality of first resistors and a plurality of first taps, and generates a control voltage having one of a plurality of predetermined voltage values by selecting one of the plurality of first taps in accordance with an inputted digital control signal. An M-tap resistor network circuit (12) is provided with a plurality of second resistors and a plurality of second taps, and generates a plurality of predetermined reference voltages at the plurality of second taps. Each of folding circuits (13, 14) generates an output signal based on differences between the control voltage and the plurality of reference voltages, the output signal having a signal level corresponding to a predetermined phase of a sine wave or a cosine wave.

Electronic generator of pulse signals under modulated carrier and associated radio frequency signal transmitter This electronic generator of pulse signals under modulated carrier includes a module (15) for modulating a pulse train whose position and amplitude are controllable, forming a switching signal (S3); a switching module (16), connected at the output of the pulse train modulation module (15), comprising at least one transistor (22), controlled by said switching signal (S3); a voltage-controlled frequency-locked oscillation module (18), having a frequency-locked band around a free oscillation frequency controlled by a control voltage, connected at the output of the switching module (16); the switching module allowing the injection of a periodic pulse signal (S4) having a frequency spectrum comprising at least one frequency line in said frequency-locked band.This arrangement allows the output of the oscillation module to produce pulsed signals (S5) with a modulated carrier controlled in frequency, phase, and amplitude. See Figure 1 for abbreviations.

The present application provides an electronic apparatus and device. The electronic apparatus comprises a first accumulator and N filter modules, each filter module among the N filter modules comprises a plurality of branches, each branch among the plurality of branches comprises a phase adjustment unit and an amplitude adjustment unit that are coupled, and an output end of each filter module is coupled to the first accumulator. For a first filter module among the N filter modules, an input end of the phase adjustment unit in the first filter module is coupled to an input end of the electronic apparatus; and for an i-th filter module among the N filter modules, an input end of the phase adjustment unit in the i-th filter module is coupled to an output end of the phase adjustment unit in an (i-1)-th filter module. In this way, as the number of filter modules increases, finer amplitude and phase adjustment can be achieved, thereby improving the amplitude and phase equalization capability of the electronic apparatus.