28 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.

The present invention relates to the field of optical fiber sensing technology, and more specifically to a MOMES and FBG fusion sensing system based on an adjustable laser array. A multi-wavelength tunable laser array light source is used to generate fast broadband frequency-sweeping laser light, which is split into M outputs via a multi-path planar optical waveguide splitter coupler. Each output end is connected to N FBG sensor arrays and one MOMES sensor, and the reflected light of the sensing signal is received by the corresponding photodetector. After data processing by a photoelectric converter, a logarithmic amplifier, an analog-to-digital converter, and an FPGA-compatible algorithm platform, the peaks and troughs of the reflected spectrum data at each wavelength point are simultaneously found. The peak data is used to demodulate the FBG sensor array, and the trough data is used to demodulate the MOMES sensor. The optical path structure and algorithm design of the system achieve synchronous demodulation of the FBG and MOMES sensors, significantly improving the system's compatibility and computational efficiency.

A system and method for continuous glucose monitoring (CGM) of blood in a blood vessel of a patient using a non-invasive sensor composed of a patch antenna operating in the Industrial, Scientific and Medical (ISM) Radio band (5.725 GHz-5.875 GHz). The device determines the blood glucose concentration of the blood in the blood vessel based on the measured shift of the resonant frequency of the non-invasive antenna patch sensor. A radio frequency (RF) synthesizer is used to drive the patch antenna with a fraction of its output coupled to both the antenna and receiver through a directional coupler. In this approach both the transmitted (FWD) and received (REV) power are processed, by demodulating logarithmic amplifiers, which convert the RF signals to corresponding voltages for downstream processing. The resulting voltages are then fed into a microcontroller and the measured shift in resonant frequency is converted to a real-time glucose concentration.

An example detector cell includes a first current source circuit having a terminal. The detector cell includes a first transistor having a control terminal, a first terminal, and a second terminal coupled to the terminal of the first current source circuit. The detector cell includes a second current source circuit having a terminal coupled to the first terminal of the first transistor. The detector cell includes a first current mirror having a first terminal and a second terminal, the first terminal coupled to the terminal of the second current source circuit and the first terminal of the first transistor. The detector cell includes a second transistor having a control terminal, a first terminal, and a second terminal coupled to the terminal of the first current source circuit. The detector cell includes a third current source circuit having a terminal coupled to the first terminal of the second transistor. The detector cell includes a second current mirror having a first terminal coupled to the terminal of the third current source circuit and the first terminal of the second transistor and a second terminal coupled to the second terminal of the first current mirror.

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).

Disclosed in the embodiments of the present disclosure are a logarithmic detector capable of calibrating an intercept, a calibration method of the logarithmic detector, and a chip. The logarithmic detector comprises: a logarithmic amplifier, which receives a radio frequency signal, performs logarithmic transformation on the radio frequency signal, and outputs a first current; a plurality of editable units, which receive a plurality of control signals, and output a plurality of enable signals, wherein the control signals are used for controlling logical states of the editable units, and the editable units output the enable signals on the basis of the logical states; a plurality of current paths, which are connected to the editable units, wherein the current paths receive the enable signals, the enable signals are used for controlling the turning-on and turning-off of the current paths, and a turned-on current path is used for outputting a compensation current; and an arithmetic unit, which is connected to the logarithmic amplifier and the plurality of current paths, wherein the arithmetic unit receives the first current and the compensation current, and outputs a second current.

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.

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.

The utility model relates to a logarithmic amplification circuit with a replaceable bottom. The logarithmic amplification circuit comprises a negative feedback module, a transistor module, an operation module, a voltage division module and a single-chip microcomputer module. An intelligent digital potentiometer in the voltage division module is accurately controlled through the single-chip microcomputer module, the resistance value of the intelligent digital potentiometer is dynamically adjusted to achieve real-time adjustment of the voltage division coefficient, the voltage division coefficient is dynamically optimized in combination with a feedback mechanism, and therefore accurate control over the output logarithmic function base number is flexibly achieved. Specifically, a microcontroller chip of the single-chip microcomputer module controls the resistance value of the intelligent digital potentiometer through a program, and judges whether the current base number reaches a target value or not according to a feedback signal; and if the target value is not reached, carrying out iterative optimization by adjusting the resistance value of the resistor until the target base number requirement is met. Finally, the circuit can flexibly adjust the logarithmic base number relation between the output signal and the input signal, so that the logarithmic amplifier can meet the requirements of different application scenes for base number changes, and the practicability and the application range of the logarithmic amplifier are remarkably improved.

The utility model provides a high-frequency photoelectric detector monitoring drive circuit, and relates to the technical field of high-speed optical fiber communication. The utility model provides a high frequency photoelectric detector monitoring drive circuit comprising a light splitting detection and signal processing unit which is composed of a light splitting detector, a logarithmic amplifier and a corresponding circuit; the signal transmission and indication unit is composed of an analog-to-digital converter (ADC), a single chip microcomputer, a corresponding accessory circuit and a corresponding interface; the power supply voltage stabilization and power supply filtering unit is composed of an input filtering circuit, a voltage stabilization module and an output filtering circuit; the anti-reverse connection and electrostatic protection unit is composed of an input filter circuit and an output filter circuit, wide-range power supply driving is achieved, adaptability is enhanced, input optical power monitoring of the 110 GHz high-frequency photoelectric detector is achieved, and a user can conveniently read the input optical power in real time.

The utility model belongs to the technical field of ultrasonic anemometers, particularly relates to a signal detection circuit based on environment feedback for an ultrasonic anemometer, and solves the technical problem that the conventional signal detection circuit cannot perform targeted compensation according to different degrees of attenuation generated by ultrasonic waves in air in different environments. Wherein the model of the program control logarithmic amplifier U1 is AD8310, a programmable resistor U2 used for adjusting slope change is additionally arranged between a pin 4 VOUT and a pin 6 BFIN of the program control logarithmic amplifier U1, and the MCU can change the resistance value of the programmable resistor U2 through I2C protocol communication; the programmable resistor U2 is used as a resistor with a changeable resistance value and is used for adjusting the gain of the amplification link; the signal detection circuit further comprises a temperature and humidity sensor U7 which is used for monitoring temperature and humidity changes in the environment in real time. According to the utility model, the ultrasonic attenuation degree difference caused by different environmental conditions is compensated, so that the wind speed measurement precision of the whole set of system under the time difference method is improved.

A digital microphone includes a log amplifier having an input for receiving an analog signal; an analog-to-digital converter (ADC) coupled to the log amplifier; a digital low-pass filter coupled to the ADC; a digital decompression component coupled to the digital low-pass filter; and a predictor filter coupled to the digital decompression component, the predictor filter having an output for generating a digital signal. The digital low-pass filter is a positive group delay filter and the predictor filter is a negative group delay filter. The digital microphone has an improved Signal-to-Noise Ratio (SNR) due to filtering, but without increasing overall group delay.

The invention provides a signal optimization method of an ADAM algorithm assisted multistage logarithmic amplifier, which comprises the following steps of: training an initialized optimal parameter group, and obtaining optimal parameters of the multistage logarithmic amplifier in an iterative updating mode. The iterative updating process comprises the following steps: setting a scale factor and a range of a pole number; the optimal score is initialized to be infinite, and the optimal parameter is set to be 0; traversing the cyclic scale factor and each parameter combination in the pole number range, and generating a test data set according to each combination; predicting the test data set by using a deep learning model, and obtaining a current score according to a mean absolute error between the test data set and a real result; updating the current score as the optimal score, and updating the scale factor and the pole number; and obtaining an optimal parameter after the traversal is finished. According to the method, the recovery of the multi-stage logarithmic amplifier to the original signal can be optimized, and the parameter combination with the optimal compensation effect can be found.

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.

The invention discloses an ultra-high turbidity online monitoring device based on infrared transmission and signal logarithmic processing, and belongs to the technical field of water quality monitoring. Comprising a single-chip microcomputer minimum system circuit, a power supply circuit, a turbidity signal conditioning circuit, a PWM drive circuit, an ADC conversion circuit and a serial port communication circuit. The turbidity signal conditioning circuit comprises a photoelectric conversion circuit, a pre-amplification circuit, a band-pass filter circuit, an effective value calculation circuit and a logarithmic amplification circuit. The PWM drive circuit comprises a PWM generation circuit and an LED drive circuit. A logarithmic amplifier is adopted to linearize a photoelectric signal subjected to exponential law attenuation; pWM modulation is carried out on an LED light source, a sampling end extracts a signal with a specific frequency, and ambient light noise is inhibited in cooperation with an 850 nm narrow-band optical filter. According to the completed experiment verification, the turbidity value and the sampling signal present a good linear relationship.

The present invention discloses a current logarithmic measuring instrument, which comprises at least two parts: a current mirror hybrid array circuit and a logarithmic measurement circuit. The current mirror array circuit is composed of a set of main loop current mirrors and multiple sets of sub-loop current mirrors in hybrid connection. The logarithmic measurement circuit is composed of a logarithmic amplifier and its peripheral circuits. The present invention is suitable for high-precision current measurement over an ultra-wide range and can continuously measure no less than 7 orders of magnitude (for example, 10 ‑7 ~10 ‑1 A) current range, filling the gap in the demand for precise current measurement in high-precision and cutting-edge industries.

The application discloses a fruit moisture content measuring circuit, a measuring method and a measuring instrument, wherein a central processing unit controls positive and negative voltage switching of a moisture sensor through a decap effect circuit; a fruit moisture content signal to be measured is sent to the central processing unit after being amplified by a logarithmic amplifier measuring unit; an environmental temperature signal of the fruit is sent to the central processing unit after being processed by a temperature measuring unit; the central processing unit corrects the resistivity of the fruit to be measured according to environmental temperature data of the fruit, calculates the moisture content of the fruit according to the corrected resistivity and outputs the moisture content. The application can intuitively view the moisture reduction process, timely correct drying process parameters according to the moisture content and target value, and on the other hand, based on the adjustment and control of the accurate process parameters of the moisture content target and process, the drying cycle can be shortened to the maximum, the energy consumption of the drying process is reduced, the sensory, physical and chemical indexes of the product are improved, and thus the product quality is improved.

An optical processing unit for performing tensor multiplication including: a first unit to emit a first light beam based on a value of a first tensor, said first unit including a first logarithmic amplifier to produce a first unit electric signal representing the log of said value of the first tensor, and a first modulator and a first light source to emit said first light beam based on said first unit electric signal; a second unit to emit a second light beam based on a value of a second tensor, said second unit including a second logarithmic amplifier to produce a second unit electric signal representing the log of said value of the second tensor, and a second modulator and a second light source to emit said second light beam based on said second unit electric signal; an optical combiner to add the first light beam with the second light beam to obtain a resulting light beam representing the log of the value of the first tensor multiplied by the value of the second tensor or the log of the value of the first tensor added to the log of the value of the second tensor; a transducer to convert said resulting light beam into a resulting electric signal, and an antilogarithmic amplifier to determine a result signal representing the antilog or exponential of said resulting electric signal.

A logarithmic amplifier includes programmable gain amplifiers each having a different gain, wherein an input of each of the programmable gain amplifiers is coupled to an input of the logarithmic amplifier; and a summing circuit having inputs coupled to a corresponding output of each of the programmable gain amplifiers and an output coupled to an output of the logarithmic amplifier, wherein the summing circuit generates a logarithmic transfer function having piecewise linear segments.

An example apparatus includes: current measurement circuitry having an output, log amplifier circuitry having an input coupled to the output of current measurement circuitry and having an output, analog to digital conversion (ADC) circuitry having an input coupled to the output of the log amplifier circuitry and an output, and programmable circuitry having an input coupled to the output of the ADC circuitry and having an output, wherein the programmable circuitry is configured to detect an arc within an Alternating Current (AC) signal provided to the current measurement circuitry.