12 results about "Log amplifier" patented technology

The invention discloses an electric power data acquisition method and equipment based on a logarithmic amplifier and a medium, and relates to the technical field of electric power monitoring signal processing, and the method comprises the steps: collecting an original analog current signal on an electric power circuit and an analog temperature signal of an environment where the logarithmic amplifier is located, and generating a mixed observation vector; based on the mixed observation vector, calculating an estimated value of a temperature characteristic correction parameter in real time through a pre-stored temperature-parameter mapping relation, and performing logarithmic compression on the original current digital signal sequence by using the estimated value of the temperature characteristic correction parameter to obtain a compressed voltage signal subjected to temperature compensation; and performing high-speed analog-to-digital conversion on the compressed voltage signal subjected to temperature compensation to obtain a discrete digital signal sequence, and storing the discrete digital signal sequence into a priority cache region. According to the invention, the data volume is effectively compressed by using the correlation between the signals, and the transmission bandwidth and the storage demand are reduced.

This invention specifically relates to a large dynamic range logarithmic detector, comprising multiple parallel detection branches and an adder that sums the detection results from the multiple branches. The detection branches use square-law detectors to detect multiple segments of radio frequency energy with different dynamic ranges, reducing the design complexity of a single square-law detector. A limiting voltage follower is used to restrict the envelope voltage output by the square-law detector to a specific voltage amplitude range. A DC logarithmic amplifier amplifies the limited envelope voltage output by the limiting voltage follower according to the logarithmic law. The adder concatenates the voltage signals output from the multiple logarithmic amplifiers in the voltage domain and outputs a video logarithmic detection voltage signal. The advantages of this invention are that it significantly expands the dynamic range of the logarithmic detector, improves the signal-to-noise ratio of the detection circuit, and simultaneously reduces the design complexity of the internal circuitry.

The application discloses a simple and high-precision constant-temperature tank based on logarithmic operation, wherein a detecting element and a heating element are R1 and R2, R1, R2, R3 and R4 constitute a measuring bridge, P1 is used for adjusting the ratio of R3 and R4, the voltage of two opposite diagonal points A-B of the bridge enters operational amplifiers A1 and A2, A1 and A2 are in-phase outputs, and two diodes are connected to two opposite-phase terminals for correcting the nonlinearity of the temperature coefficient of the heating element, so that A1 and A2 each constitute a logarithmic amplifier with the diodes, the outputs of A1 and A2 control transistors TR3 and TR4 respectively, and then control the adjusting tubes TR1 and TR2 of a constant-current voltage stabilizer, the voltage Eo between the emitters of TR1 and TR2 is always kept unchanged, the current io passing through the bridge is also supplied by a constant-current source, and the constant-temperature tank dynamically maintains constant temperature.

Hybrid Linear Algebra Optical Processing Unit without Interferometer: An optical processing unit for performing tensor multiplication on a first tensor value and a second tensor value. The optical processing unit includes: - a first converter configured to convert the value of the first tensor into a first analog signal, - a first logarithmic amplifier to convert the first analog signal into a second analog signal representing the logarithm of the first tensor value, - a first modulator and a first light source to convert the second analog signal into a first light beam, - a second converter configured to convert the value of the second tensor into a third analog signal, - a second logarithmic amplifier to convert the third analog signal into a fourth analog signal representing the logarithm of the second tensor value.- a second modulator and a second light source to convert the fourth analog signal into a second light beam, and - an optical combiner to add the first light beam with the second light beam to obtain a resulting light beam representing the logarithm of the value of the first tensor multiplied by the value of the second tensor, or the logarithm of the value of the first tensor added to the logarithm of the value of the second tensor.

A logarithmic amplifier (200) includes a logarithmic current preamplifier circuit (202) and a logarithmic amplifier circuit (204). The logarithmic current preamplifier circuit (202) includes an inverting input terminal (206A), an output terminal (206B), and a first diode (210). The first diode (210) is coupled between the inverting input terminal (206A) and the output terminal (206B) of the logarithmic current preamplifier circuit (202). The logarithmic amplifier circuit (204) includes an inverting input terminal (212A), an output terminal (212B), and a second diode (214). The inverting input terminal (212A) of the logarithmic amplifier circuit (204) is coupled to the output terminal (212B) of the logarithmic current preamplifier circuit (202). The second diode (214) is coupled between the inverting input terminal (212A) and the output terminal (212B) of the logarithmic amplifier circuit (204).

This invention discloses a power data acquisition method, device, and medium based on a logarithmic amplifier, relating to the field of power monitoring signal processing technology. The method includes: acquiring raw analog current signals from power lines and analog temperature signals from the environment where the logarithmic amplifier is located, generating a hybrid observation vector; based on the hybrid observation vector, calculating estimated values ​​of temperature characteristic correction parameters in real time through a pre-stored temperature-parameter mapping relationship, and using these estimated values ​​to perform logarithmic compression on the raw current digital signal sequence to obtain a temperature-compensated compressed voltage signal; performing high-speed analog-to-digital conversion on the temperature-compensated compressed voltage signal to obtain a discrete digital signal sequence, and storing the discrete digital signal sequence in a priority buffer area. This invention utilizes the correlation between signals to achieve effective data compression, reducing transmission bandwidth and storage requirements.

The invention discloses a synchronizing signal detection device in a quantum key distribution system, which is characterized in that the cathode of a PIN tube is connected with one input end of a voltage comparator through a first low-noise amplifier, a low-pass filter and a second low-noise amplifier, and the anode of the PIN tube is connected with the other input end of the voltage comparator through a logarithmic amplifier, an analog-to-digital converter, an MCU and a digital-to-analog converter. According to the synchronous signal detection device in the QKD system, accurate signal synchronization and normal parameter scanning of a receiving party and a transmitting party are realized through a scheme with lower design complexity and device index requirements.

The invention relates to a broadband amplitude detector circuit of a CMOS process, and the circuit comprises a logarithmic amplifier circuit which is used for carrying out the multi-stage amplitude limiting amplification of an original radio frequency signal; the DC offset offset module comprises a DC compensation module and an offset offset circuit, and the DC compensation module is used for filtering an input signal in the amplified radio frequency signal and retaining the amplified offset voltage; the offset counteracting circuit is used for carrying out subtraction operation on the amplified offset voltage and an input signal in the original radio frequency signal; and the peak detection circuit is used for extracting the amplitude of the signal after the subtraction operation. Compared with the prior art, the broadband amplitude detector has the advantages that the problem that bandwidth, sensitivity and temperature stability in a traditional amplitude detector are mutually restricted is solved, detection performance with wider working frequency band, higher temperature stability and better dynamic range is achieved on the standard CMOS technology, meanwhile, the structure is simple, power consumption is low, and integration convenience and application prospects in a monolithic system are greatly improved.

A method for wafer testing an event-based vision sensor (EVS), the EVS sensor comprising a photodiode, a logarithmic amplifier configured to generate an amplified signal in response to voltage received by the photodiode, a first buffer, and a bitline (BL), the method including determining a performance of the logarithmic amplifier, where determining the performance includes irradiating a pixel array by sweeping irradiance, feeding an output of the pixel array into the BL, probing one or more output of the BL with an analog-to-digital converter (ADC), and monitoring the one or more outputs of the BL, wherein the performance is determined based upon the one or more outputs of the BL.

Radar signal processing device (14) comprising: a signal receiver (20) which is configured to receive received data in a polar coordinate system based on a received signal; a data storage device for previous data, designed to store previous correlated data in the polar coordinate system; a polar coordinate correlator (21) designed to generate correlating data by establishing a correlation in the polar coordinate system between the received data and the previous correlated data stored in the data memory of previous data, have been carried out; a trend curve calculation module (22) configured to calculate a trend curve of a distance-direction signal level of the received data in the polar coordinate system; and a target acquisition module (24) which is trained to identify a target based on the signal level of the received data and the trend curve, wherein the polar coordinate correlator (21) modifies the contents of the correlation of the received data based on the target acquisition result of the target acquisition module (24), characterized in that the signal receiver (20) has a log amplifier (26) and a linear amplifier (32) and wherein the signal receiver (20) outputs a log amplifier (26) to the trend curve calculation module (22) and the target acquisition module (24) and outputs a linear amplifier (32) to the polar coordinate correlator (21).

Optical signal detectors, systems including the detectors, and methods of using the detectors and systems are provided. The optical signal detector may include an aperture for receiving an optical signal, an optical signal sensor having separate photodiodes each configured to be irradiated with portions of the optical signal directed from the aperture, detect the portions of the optical signal impinging therewith, and generate analog signals therefrom, logarithmic amplifiers each configured to receive the analog signals from a corresponding one of the photodiodes of the optical signal sensor, perform logarithmic amplification of the received analog signals, and generate logarithmic analog signals from the analog signals.

Device and method for detecting reactive luminescent nano- or micro-particles embedded in a composite comprising a polymeric matrix with carbon-black or sulphur-black particles, or embedded in a sulphur-dyed substrate or surface, comprising: an infrared or ultraviolet illuminator for illuminating the luminescent particles; a near-infrared photodiode sensor for capturing a near-infrared response of the illuminated luminescent particles; a dark chamber for placing over the substrate or surface, inside which the illuminator and photodiode sensor are mounted; a logarithm amplifier for amplifying and linearizing a response signal captured by the photodiode sensor; an electronic data processor configured for detecting the reactive luminescent particles, by carrying out the steps of: illuminating the substrate or surface with the illuminator; acquiring the amplified linearized signal captured by the photodiode sensor; detecting the presence of luminescent particles in the composite or substrate or surface from the linearized decay of the acquired signal.