62 results about "Noise matching" patented technology

Provided are a receiving apparatus and method for a wireless communication system using multiple antennas. A receiving method for a wireless communication system using multiple paths, the receiving method comprising: receiving signals through a predetermined number of multiple paths; sensing a carrier according to saturation state degrees of the signals, and providing saturation state information; calculating automatic gain components of the received signals by using the received signals and the saturation state information of the received signals; and performing a noise matching process to amplify noises on the predetermined multiple paths according to the automatic gain components during a predetermined period.

The invention discloses a single-ended input and differential output parallel dual-frequency low noise amplifier (LNA) and a design method thereof. The LNA can be applied to a digital TV, wireless communication and a navigation receiver and mainly comprises an input matching network, a main amplification circuit, an output network and a single-ended to differential circuit. The main amplification circuit adopts a cascode structure and has favorable reverse isolation degree; the input matching network enables the LNA to realize impedance matching and noise matching simultaneously in input stage and dual frequency ranges, and thus the noise performance of the circuit is improved at the same time of ensuring the maximum power transmission; and the singled-ended to differential circuit ensures that the LNA can be directly cascaded with a front-end antenna and a rear-end mixer circuit and easy to integrate. The LNA disclosed by the invention not only has a simple design, but also ensures that the system power consumption and area are reduced due to parallel dual-frequency receiving.

The invention discloses a monolithic integrated radio frequency high-gain low-noise amplifier which comprises an input match circuit, a first level amplifying circuit, a second level amplifying circuit and an output match circuit. A typical cascode structure with source electrode inductance negative feedback is adopted by the first level amplifying circuit. The second level amplifying circuit is of a common source electrode structure with resistance feedback. Due to the fact that the Chart 0.18-micrometer radio frequency complementary metal oxide semiconductor (RFCMOS) technology is adopted by the second level amplifying circuit, the circuit design of complete integration of all active devices and passive devices on a monolithic is finished. The monolithic integrated radio frequency high-gain low-noise amplifier achieves optimal noise matching and input impedance matching at the same time, not only enables a circuit to have optimal noise performance, but also enables the circuit to achieve power transfer better. Besides, the monolithic integrated radio frequency high-gain low-noise amplifier is high in gain, good in stability and capable of enabling the circuit structure to be high in practical value. Through validating, input and output matching of the circuit is good, and the circuit has gain of more than 27dbs and noise of 2dbs.

The invention relates to a millimeter-wave single-chip integrated low-noise amplifier (LNA) which belongs to the electronic technical field and comprises two Runge bridges and a two-way (balanced-type) five-stage amplification structure connected between the Runge bridges in a circuit structure. The whole amplifier circuit is integrated on a single gallium arsenide chip or a silicon chip. The invention adopts a PHMET process, has excellent noise performance and adopts input conjugation match and noise match to simultaneously realize high gain and low noise. In a bias aspect, the invention removes a one-fourth wavelength line used in a traditional LNA for direct current bias to greatly reduce the chip area, adopts a self-supply bias mode to reduce the numbers of power supplies and devices, and adopts the two Runge bridges to form a balanced-type structure so as to improve the stability, the maximum output power, the standing wave performance and the noise performance of the LNA. The invention can be applied in a radar system, a communication system, and the like.

This invention discloses a low noise amplifier used in radio communication and pilot receivers and a realization method, which offsets transistors of common-source and common-grating on a middle inversion region, in which, the supply used is a low-voltage one, a capacitance parallel series array is parallel between the grating and the source of a common-source transistor, and power loss of the noise amplifier is reduced greatly, the ratio of gain-power loss is increased reaching to 20dB/mW to realize match of noise and power gain and reduce requirement to cell volumes by receivers of the radio communication system and pilot system by adjusting set values of the low voltage source and the capacitance parallel-series array and selection of parallel and serial inductors.

Provided are apparatus and method for receiving signals in a wireless communication system. A receiving apparatus including a plurality of variable gain amplifier units configured to respectively control the gains of radio frequency (RF) signals received respectively through a plurality of antennas, and a plurality of analog-to-digital converters configured to respectively convert the output signals of the respective variable gain amplifiers into digital signals, includes: an automatic gain controller configured to calculate the gain values of the respective gain control amplifier units by receiving the digital signals outputted from the respective analog-to-digital converters, select the minimum gain value among the calculated gain control values, and calculate the differences between the minimum gain value and the other gain values; and a noise matching amplifier configured to attenuate the digital signals outputted from the respective analog-to-digital converters according to the calculated difference values.

The invention relates to a capacitance negative feedback type low noise amplifier. The existing low noise amplifier is complex in circuit structure and is existed with outside noise. The invention provides a capacitance feedback type low noise amplifier with simple structure, the low noise amplifier can balance and amplify conflict between noise matching and power matching of circuit without introducing extra outside noise. In the invention, an appropriate capacitance value is added between the source electrode and drain electrode of a field effect tube on the basis of low noise amplifier circuit after initial design, thus optimal input matching point of the low noise amplifier circuit can be close to the optimal noise matching point. The essence thereof is that the real part of optimal input matching impedance of the original amplifying circuit is changed and is caused to be closer to the real part of optimal noise matching impedance of amplifying circuit. The invention is simple in circuit structure and is convenient to implement; and conflict between noise matching and input matching of low noise amplifier can be balanced.

The invention relates to the technical field of radio frequency, and discloses a tunable broadband low-noise amplifier. The tunable broadband low-noise amplifier comprises a matching network, a switched capacitor output frequency selection network and an amplifying circuit; a signal input end is connected with the matching network for noise matching; the amplifying circuit is of a common-source common-gate structure. The grid of the first transistor is connected with the matching network; the grid electrode of the second transistor is grounded after being connected with a third capacitor, thesource electrode of the first transistor is grounded after being connected with a third inductor, the drain electrode of the second transistor is grounded after being connected with a fifth inductor and a fourth capacitor, the drain electrode of the second transistor is further connected with a switched capacitor output frequency-selecting network and a fourth inductor, and the fourth inductor isconnected with a signal output end. According to the structure, the switched capacitor can be adjusted to output the frequency-selecting network, and the conversion of the working frequency is realized, so that the performance of the low-noise amplifier on each frequency band is improved, the gain and noise indexes are improved, and the receiver sensitivity is improved. The input network with thestructure has broadband characteristics, and the output network has narrowband and tunable characteristics.

The invention relates to the technical field of microwave communication equipment, and particularly discloses a single-end-structure low noise amplifier. The single-end-structure low noise amplifier comprises an amplifying tube, an input matching circuit, an output matching circuit, a direct-current bias circuit and a grounded micro-strip line, wherein a grid electrode of the amplifying tube is connected with the input matching circuit; a source electrode of the amplifying tube is connected in series with the grounded micro-strip line, and grounded; a drain electrode of the amplifying tube is connected with the output matching circuit; the direct-current bias circuit is connected between the input matching circuit and the output matching circuit; the input matching circuit performs minimum noise matching with a Smith circle diagram, and uses a T type micro-strip line structure; the output matching circuit performs maximum gain matching with the Smith circle diagram, and uses the T type micro-strip structure; and the direct-current bias circuit is supplied with power by a resistance self-bias single power supply. Smith circle diagram matching and the T type micro-strip structures are adopted in the input and output circuits, so that good performance parameters are achieved at the same time, and input and output standing-wave ratios, a noise coefficient and a gain are taken into account at the same time.

The invention provides an underwater AUV detection method for adaptive matching stochastic resonance, comprising the following steps: whitening a received time domain signal, establishing a second-order nonlinear bistable stochastic resonance system, and implementing the noise matching and frequency matching by optimizing a output signal-to-noise ratio gain measure and synchronous gramer escape rate; according to a set step size, selecting a maximum signal-to-noise ratio as an optimal matching value, and extracting a corresponding signal frequency as a target characteristic line spectrum frequency; and using the work kurtosis as a test statistic to determine whether the signal is present or not. According to the underwater AUV detection method for the adaptive matching stochastic resonance, signal energy and a local signal-to-noise ratio at a target characteristic line spectrum can be greatly improved, and an output of a characteristic signal in completely submerged noise can be obviously enhanced.

According to one embodiment, a concurrent impedance and noise matching transconductance amplifier designed for implementation in a receiver comprises an input device configured to couple to a matching network of the receiver, and a boost capacitor connected to the input device to increase an input capacitance of the transconductance amplifier. The boost capacitor is selected to substantially minimize the receiver noise and to enable the concurrent impedance and noise matching of the receiver and the matching network. In one embodiment, the receiver comprises the transconductance amplifier to provide an amplified receive signal, and a mixer to produce a down-converted signal corresponding to the amplified receive signal, wherein the mixer is coupled to the transconductance amplifier by a blocking capacitor. The blocking capacitor is selected to substantially increase an amplitude ratio of the down-converted signal to the amplified receive signal to substantially increase the front-end gain of the receiver.

The invention discloses an imaging coordinate correction method based on matching error inhibition. The measurement image background area is manually marked, and matching point pairs are acquired; based on the matching point pairs, the iterative error method is utilized to model a geometric correction mapping matrix, and accuracy of the experimental result is improved; on the basis, the Euclideandistance and the threshold are utilized to detect and inhibit noise matching points; iterative error is reused to fit a new mapping matrix, and reference images are corrected; a measurement image is fused with an edge binary mask to acquire foot coordinates; the edge of a measurement image is fused with the reference images after geometric correction, and a foot-aligned reference image is acquiredthrough horizontal translation according to the foot point error. The method is advantaged in that the method is visual and effective, strong robustness is realized, the scene fitness is high, not only can a problem that imaging coordinates are affected by the background information, the complex structure miscellaneous information and the foot neighbor structure information in alignment calibration be solved, but also a problem of inconsistency of the fitting results of the multiple reference images can be solved.

The invention discloses a sound processing device capable of intelligently suppressing noise, and the device comprises a sound input module, a noise parameter set module, a noise processing module anda sound output module. The sound input module is used for receiving a total signal in a current environment, and the total signal comprises a useful signal, steady-state noise and transient noise. The noise parameter set module is used for storing specific types of noise parameters. The noise processing module is used for matching the transient noise with a specific type of noise and suppressingthe transient noise and the steady-state noise to obtain a suppressed useful signal; and the sound output module is used for outputting the suppressed useful signal. The transient noise is matched with the specific type of noise in real time through the noise processing module. The transient noise is suppressed; meanwhile, the suppressed useful signal can be obtained by suppressing the steady-state noise, the noise reduction function of the transient noise and the steady-state noise is achieved, the sound processing device for intelligently suppressing the noise is applied to different systems, and suppression of a certain kind of transient noise or suppression of several kinds of transient noise can be started or stopped through system setting.

The invention discloses an ultra-wideband low-noise amplifier, which comprises a first bipolar transistor Q1, a second bipolar transistor Q2, a third bipolar transistor Q3 and a fourth bipolar transistor Q4. A negative feedback loop is formed by a first inductor L2 and a second resistor R2; ultra-wideband power matching and noise matching are performed on the first bipolar transistor Q1 so that 50Ohm input impedance matching and output impedance matching in an ultra-wideband frequency range of 0.5 GHz-20 GHz can be achieved; and also, it can be achieved that the noise coefficient in the ultra-wideband frequency range of 0.5 GHz-20GHz is lower than 4dB. In addition, the circuit in the invention is simple in structure and small in overall area.

The invention discloses an ultra-wideband bidirectional amplifier based on a 500nm GaAs pHEMT process, which comprises a low-noise amplifier for realizing wideband and low-noise matching, a power amplifier for realizing wideband and maximum power matching, a single-pole double-throw switch A and a single-pole double-throw switch B, and two ends of a switch tube of the ultra-wideband bidirectional amplifier are respectively provided with the same 5V positive voltage control switch unit. The ultra-wideband bidirectional amplifier based on the 500nm GaAs pHEMT process can realize ultra-wideband and high-frequency coverage to 10.6 GHz at the same time, and has excellent performance of an Rx-path LNA amplifier and a Tx-path PA amplifier. In addition, the 5V positive pressure control switch units arranged at the two ends change a negative pressure control switch tube into positive pressure control, and use is more convenient.

The invention relates to a low-frequency and low-noise measurement amplifier. The low-frequency and low-noise measurement amplifier is characterized by comprising a noise matching transformer, a front-stage amplification circuit, a band-pass filter and a post-stage amplification circuit. The noise coefficient and the common-mode rejection ratio of the noise measurement amplifier disclosed by the invention are far greater than numerical values of most of low-frequency and low-noise amplifiers on the market; and furthermore, a design circuit satisfies requirements on low-frequency noise measurement in a 0.90-80.20 kHz range.

The invention discloses a circuit and a method for cancelling the preceding stage thermal noise of low noise amplifier. By the traditional method, noise matching and conjugation matching are difficultly achieved at the same time, and particularly the compromise relationship of bandwidth and noise has certain limit. The circuit comprises a direct current power supply Vcc, a first inductor L1, a second inductor L2, a first resistor R1, a second resistor R2, a third resistor R3, a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a first capacitor C1, a second capacitor C2 and a third capacitor C3. By the method, the preceding state thermal noise of the amplifier is detected through a thermal noise cancelling technology, and is added and cancelled by two signal paths which have opposite gains after being finely adjusted. By the circuit and the method, the preceding stage thermal noise is completely cancelled, the compromise relationship of the noise matching and the conjugation matching is not required to be considered in the circuit, and the wideband low noise performance is relatively easily obtained.

The invention discloses a variable-gain low-noise amplifier with broadband flat gain. The amplifier comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a first bias resistor, a second bias resistor, a first NMOS transistor, a second NMOS transistor, a first group of switching transistors, a second group of switching transistors, n resistors, n control voltages, a DC bias and a power supply, wherein each of the first group of switching transistors and the second group of switching transistors comprises n switching transistors. According to the invention, better compromise between noise matching and broadband input matching is realized by adoptinga transformer through gate drain of the input transistor, and broadband flat gain response is realized by adopting a double-gate inductance peaking technology; and the digital switch controls the voltage flatness gain.

The invention discloses a noise isolation decorative material, which comprises a wall brick body, the wall brick body is a cuboid, and several horizontal noise reduction holes are arranged on the wall surface brick body, and one side of the wall surface brick body is attached to the On the inner side of the building wall, the other side is provided with a decorative board. The side of the decorative board facing the brick body of the wall is provided with a number of bosses matching the noise reduction holes. The middle part of the boss is provided with a fixed shaft perpendicular to the decorative board. A number of sound-absorbing sheets are connected to the top, and the decorative plate and the wall brick body are connected to the boss through noise-reducing holes. It has excellent noise prevention and sound insulation functions, which can improve the sound insulation performance of the house and improve the comfort of residents.

The invention discloses an electronic device with calibration function and a method for calibrating an electronic device. The device includes an internal signal generator for generating a correction signal; a front-end input stage for receiving a radio frequency signal from an input node; an electrostatic discharge protection unit for protecting against electrostatic discharge; a switch unit coupled to The ESD protection unit is used to selectively transmit a correction signal to the front-end input stage, wherein due to the connection of the switch unit and the ESD protection unit, the noise performance of the direct down-converting receiver in the normal mode can be different from the matching condition Influenced by the switching unit. The advantage of the present invention is that the switching unit does not affect the performance of the receiver operating in the normal mode, and another advantage is that the correction can be generated internally through the connection of the switching unit and the electrostatic discharge protection circuit without complicated circuits Signal.