9 results about "Nonlinear amplifier" patented technology

An imaging method of a coherent Raman scattering imaging device based on spectral progressive scanning according to the present invention includes a synchronous two-color light source, a nonlinear amplification and spectral broadening module, a spectral progressive scanning control module, a linear amplification module, a beam combining and sample detection module, and a data processing module. The present invention does not require tuning a laser oscillator, nor does it require time scanning. By controlling the seed light and pump light of the nonlinear amplifier, adjusting parameters such as the dispersion, power, chirp of the seed light, and the pump power of the amplifier, the spectral evolution of the nonlinear amplifier is dynamically adjusted, so that it gradually transitions from a narrow spectrum to a wide spectrum, and from covering a single Raman peak to progressively covering multiple Raman peaks. This spectral progressive scanning coherent Raman light source can achieve simultaneous imaging of multiple chemical bonds, has a fast scanning speed, a flexible imaging method, and combines high spectral resolution and a wideband detection range, and also provides a new way to eliminate noise in coherent Raman scattering imaging.

The present invention discloses an amplifier linearization design verification method and a storage medium. By utilizing negative impedance compensation to compensate a nonlinear amplifier circuit, the closed-loop gain and linearity of the nonlinear amplifier circuit are improved, thereby reducing the nonlinear distortion of the amplifier. At the same time, fewer components are required, thereby improving the overall reliability of the circuit. By analyzing the total harmonic distortion and intermodulation distortion of the linearized amplifier circuit, the relative distortion level of each harmonic component of the linearized amplifier circuit can be clearly expressed, and the complexity of the entire amplifier circuit is reduced, the flexibility of constructing the amplifier circuit is improved, and the applicability of the amplifier linearization design verification method is improved.

The present application discloses a method and system for improving the linear response dynamic range of a SiPM photoelectric sensor, comprising: performing beam shaping on a received incident light signal and irradiating the shaped light signal onto a photosensitive surface of a rear-mounted SiPM sensor; the SiPM sensor converting the received light signal into a current signal and transmitting the current signal to a transimpedance amplifier; the transimpedance amplifier converting the received current signal into a voltage signal and transmitting the voltage signal to a nonlinear amplifier; the nonlinear amplifier performing nonlinear correction based on the intensity amplitude of the received voltage signal; the design of this method, on the one hand, improves the linearity of the SiPM's response to strong light by performing nonlinear correction on the response output signal under strong light irradiation; on the other hand, optimizes the linearity of the SiPM's response to weak light by improving the circuit resolution, ultimately increasing the SiPM's linear dynamic response range to 6 orders of magnitude (pW-uW).

The invention discloses an amplifier linearization design verification method and a storage medium, a non-linear amplifier circuit is compensated by negative impedance compensation, so that the closed-loop gain and linearity of the non-linear amplifier circuit are improved, the non-linear distortion of an amplifier is reduced, and meanwhile, the required devices are few, and the cost is low. The overall reliability of the circuit is improved; by analyzing the total harmonic distortion and the intermodulation distortion of the linear amplifier circuit, the relative distortion level of each harmonic component of the linear amplifier circuit can be clearly expressed, the complexity of the whole amplifier circuit is reduced, the flexibility of building the amplifier circuit is improved, and the application range of the amplifier circuit is widened. And the applicability of the amplifier linearization design verification method is improved.

The application belongs to the technical field of laser, and relates to a high-energy ultrashort pulse laser. The laser comprises a mode-locked fiber laser oscillator, a nonlinear amplifier, a stretcher, a pulse selection module, a pre-amplification stage, a main amplification stage and a compressor. In the laser, the cavity dispersion of the mode-locked fiber laser oscillator is negative dispersion which is designed optimally, and the output pulse is injected into the nonlinear amplifier after pre-chirp management, so that a flat wide spectrum can be obtained; the stretcher, the pulse selection module, the pre-amplification stage, the main amplification stage and the compressor are combined to realize further efficient amplification of the injected pulse. The application can adopt a full polarization maintaining structure which has high stability and reliability, and realizes common use of nonlinear amplification and chirped pulse amplification technology, so that the gain narrowing problem in the traditional chirped pulse amplification process can be overcome, the single pulse energy amplification limit of the nonlinear amplification technology can be broken through, and finally the output of high-energy ultrashort laser pulse is realized.

A high-frequency signal generation device according to the present invention comprises: (A) a clock signal generating unit that generates a clock signal using a harmonic component that is generated by a non-linear amplifier; (B) a DDS (direct digital synthesizer) that uses the clock signal as a system clock for operating internal processing and generates a frequency signal having a frequency that is set by frequency setting data; and (C) a high-frequency unit that is composed of a non-active frequency multiplier that does not use an active element and that increases the frequency of the frequency signal generated by the DDS. The clock signal is generated by using the harmonic component that is generated by the non-linear amplifier, an increase in speed is handled by shortening a delay time in a variable function of the frequency, and a high C / N ratio is handled by suppressing spurious emission and phase noise.

A low power analog Long Short-Term Memory (LSTM) recurrent neural network has an input layer, an array of Adaptive Filter Unit for Analog LSTM, a linear projection layer, and an output layer. The output layer has multiple nonlinear amplifiers, a nonlinear element with a sigmoidal input-output characteristic function, and a time-constant adjustable, nonlinear, low pass filter that provides the memory function of the LSTM. The LSTM memory is used with mismatch-robust weights determined by learning by computation of optimal weights values, wherein the objective function minimizes misdetection probability, and used to process a signal to detect events.

The present invention discloses a waveform optimization method and system for improving the accuracy of radar angle estimation, and relates to the technical field of radar transmission waveform optimization. The method comprises: step S1, using a MIMO radar to transmit a first transmission waveform to space, the first transmission waveform is used to roughly detect the angle and amplitude information of an aerial target; step S2, using the angle and amplitude information of the aerial target to generate an optimized second transmission waveform, using the MIMO radar to transmit the second transmission waveform to the space, the second transmission waveform is used to determine the precise position of the aerial target. The method can automatically obtain the rough position and amplitude of the target, and use the information to design a transmission waveform to improve the angle estimation accuracy; through the low peak-to-average ratio constraint, the transmission waveform can be power amplified by a nonlinear amplifier, improve the transmission efficiency, reduce the distortion of the transmission waveform, and reduce the difficulty and cost of engineering implementation; the proposed algorithm can ensure convergence, and the complexity of the algorithm is low; in addition, the designed waveform can improve the angle resolution capability of the MUSIC algorithm, and has a certain robustness, and can better adapt to complex electromagnetic environments.

A device can include a linear error amplifier coupled with an output node and configured to regulate a voltage at the output node based on an input reference voltage, the linear error amplifier receiving a first voltage source as a supply voltage, the linear error amplifier having a first transient response time and a first measure of accuracy. A device can include a non-linear error amplifier coupled with the output node and receiving a second voltage source as a supply voltage to regulate the output node responsive to the voltage at the output node going below the reference voltage by a first magnitude, the non-linear error amplifier having a second transient response time that is lower than the first transient response time, and has a second measure of accuracy indicating that the non-linear amplifier is less accurate than the linear error amplifier.