938results about "Amplifier modifications to reduce temperature/voltage variation" patented technology

The invention relates to the technical field of wireless communication, and provides a radio frequency power amplifier and a radio frequency chip, the radio frequency power amplifier comprises an input matching circuit, a first-stage amplifier, a first inter-stage matching circuit, a second-stage amplifier, a second inter-stage matching circuit, a third-stage amplifier and an output matching circuit which are electrically connected in sequence; the radio frequency power amplifier further comprises a control module, a direct current power supply module, a first bias circuit, a second bias circuit and a third bias circuit. The first biasing circuit comprises a power detection network and a switch control circuit; the first input end of the power detection network serves as the first input end of the first bias circuit, the second input end of the power detection network serves as the second input end of the first bias circuit, and the power detection network is used for receiving a radio frequency signal, converting the radio frequency signal into a control voltage in a detection mode and outputting the control voltage to the input end of the switch control circuit. The control switch controls connection or disconnection of the circuit. According to the invention, the robustness of power can be improved.

The invention discloses a slew rate enhancement circuit of an operational amplifier, which comprises a comparison module used for comparing a positive input voltage and a negative input voltage of the operational amplifier and generating a first comparison signal and a second comparison signal according to a comparison result; the slew rate enhancing module is used for enhancing the slew rate of the falling edge of the output voltage of the operational amplifier according to the first comparison signal and enhancing the slew rate of the rising edge of the output voltage of the operational amplifier according to the second comparison signal; the common-mode feedback module is used for clamping the common-mode voltage of the first comparison signal and the common-mode voltage of the second comparison signal to a reference voltage when the operational amplifier is in a steady state, so that the slew rate enhancing module is in a closed state; therefore, the slew rate of the output voltage of the operational amplifier can be quickly enhanced when the operational amplifier has large step signal output, so that the output of the operational amplifier is quickly responded and established.

The invention provides a correlated double-sampling program-controlled gain amplifier for a high-energy particle detection pixel sensor and an implementation method, and solves the technical problem that a large dynamic range and high readout precision cannot be considered at the same time during existing high-energy particle detection. The circuit comprises a correlated double-sampling circuit, a signal polarity conversion circuit, an amplification feedback circuit and a configuration automatic judgment circuit. The correlated double sampling circuit is used for performing double sampling on the output voltage of the pixel signal to obtain twice sampling voltage; the configuration automatic judgment circuit is used for selecting configurations for switching according to the voltage difference between the two sampling voltages to obtain an output signal; and the amplification feedback circuit is used for performing fixed gain voltage amplification on the output signal to obtain an amplified voltage signal. The circuit can be widely applied to the technical field of integrated circuits.

The utility model provides a CP sampling circuit of an automobile alternating current charging pile, and relates to the technical field of CP sampling circuits, the technical scheme provided by the utility model adopts a double-path sampling design, CP signals in two forms of PWM and DC can be processed at the same time, and the signal processing precision is improved through multi-stage amplification and filtering. The overall structure of the circuit enables the circuit to quickly respond to the voltage change of the CP signal in different charging stages and accurately identify different voltage levels, so that the sampling speed and accuracy of the automobile AC charging pile to the CP signal can be improved.

The utility model provides a kind of electrostatic discharge protection circuit and low noise amplification module, the electrostatic discharge protection circuit is applied to low noise amplification circuit, the low noise amplification circuit includes input matching circuit and the low noise amplifier of the output end being connected to the input matching circuit;The electrostatic discharge protection circuit includes inductance and resistance;The first end of the inductance is used to connect to the signal input end of low noise amplifier;The first end of the resistance is connected to the second end of the inductance, and the second end of the resistance is grounded.The electrostatic discharge protection circuit in the utility model is connected to the input end of low noise amplifier, and the noise coefficient of low noise amplifier will not be deteriorated, and the performance of low noise amplifier will not be affected, and the input stability of low noise amplifier will not be affected simultaneously.

The invention discloses a broadband high-precision voltage compensation control method of a power amplifier, relates to the technical field of broadband compensation, and is used for solving the problem of low voltage compensation efficiency caused by cooperative distortion caused by mutual regulation and control when the signal frequencies of different input channels are close. Recording information of the input signal is called to judge the signal type of the input signal, when the multi-frequency signal exists in the analysis database, the signal amplitude and the signal frequency of the multi-frequency signal are collected, the high-order intermodulation distortion degree of the input signal is judged, and the distortion index of the multi-frequency signal is calculated; selecting to start intermodulation distortion processing or enter a frequency coexistence risk test mechanism according to the high-order intermodulation distortion degree of the multi-frequency signals, calculating frequency intermodulation characteristics of different single-frequency signals, and performing effect integration on the frequency intermodulation characteristics of all the single-frequency signals in the analysis database according to the number of the single-frequency signals; and judging whether to carry out intermodulation distortion processing or not by combining the distortion index of the multi-frequency signal.

The invention provides a control system for suppressing peak of output voltage and current of a power amplifier. The system comprises a PS signal processing module, a PL signal processing module and a high-voltage power circuit, wherein the PS is configured to receive a bus signal issued by an upper computer, execute digital Gaussian filtering processing on the bus signal and then transmit the bus signal to the PL signal processing module; meanwhile, relevant data of the power amplifier are collected and uploaded; the PL signal processing module is configured to receive a signal which is issued by the PS and is subjected to digital Gaussian filtering processing, and pre-process the signal; and transmitting the processed signal to a high-voltage power circuit to control the high-voltage power circuit to execute power conversion operation on the load. According to the method provided by the invention, smooth transition is realized at the phase jump position of the signal by adjusting the parameters of the digital Gaussian filter, so that the peak of the output voltage and current of the power amplifier is inhibited, the stress of a post-stage high-voltage power circuit device is reduced, the post-stage output power is effectively improved, and the stability of the power amplifier is improved.

The invention relates to the technical field of amplifiers, and discloses an analog-to-digital converter combination instrument amplifier which comprises a first-stage amplifier, the first-stage amplifier is in signal connection with a second-stage amplifier, the second-stage amplifier is in signal connection with a front-end low-pass filter (LPF), the front-end low-pass filter (LPF) is in signal connection with an analog-to-digital converter (ADC), and the analog-to-digital converter (ADC) is in signal connection with the analog-to-digital converter. And an unbalanced input-to-balanced differential circuit output module is arranged between the second-stage amplifier signal and a front-end low-pass filter (LPF). From the perspective of signal processing and conversion, a precise signal transition bridge is constructed by adding an unbalanced input-to-balanced differential circuit output module, unbalanced signals output by a second-stage amplifier are converted into double-end balanced differential signals, common-mode noise interference is effectively resisted through a differential transmission mode, the signal purity is guaranteed, and the signal quality is improved. The front-end low-pass filter and the analog-to-digital converter are adaptive to differential signals, so that the signal transmission is stable and anti-interference, and the analog-to-digital conversion is more accurate.

A current sense amplifier measures a voltage drop in a drive transistor LS to measure the current flowing through the drive transistor LS. The current sense amplifier includes a preamplifier pre-amp, to which a voltage across the drive transistor LS is inputted, and which obtains a positive output and a negative output corresponding to a voltage difference of the inputted voltage across the drive transistor; and a switch sw, which connects the input end of a common mode voltage vcm and the negative output, the common mode voltage vcm serving as the operation reference of the preamplifier pre-amp. A change of the positive output caused by turning on / off the switch sw can be detected.

A control device (100) for controlling at least one actuator (200) for actuating an optical element (310) of an optical system (300), comprising an amplifier (110) which is configured to receive a provided supply voltage (V1) at an input node (K1) and to provide a control voltage (V2) for the actuator (200) at an output node (K2), wherein the amplifier (110) has a resistive voltage divider (R1, R2) for adjusting the gain of the amplifier (110) with a first resistor (R1) and a second resistor (R2) and a capacitive voltage divider (C1, C2) with a first capacitor (C1) and a second capacitor (C2), wherein the capacitive voltage divider (C1, C2) is connected in parallel to the resistive voltage divider (R1, R2).

The invention discloses an automatic temperature compensation traveling wave low-noise amplifier and a chip, and belongs to the technical field of low-noise amplifiers. The amplifier comprises a plurality of high-frequency attenuation amplification modules which are connected in parallel, a grid electrode absorption load, a grid voltage temperature compensation bias module, a drain electrode absorption load and a drain voltage temperature compensation bias module. According to the low-noise amplifier, automatic temperature compensation at different temperatures is achieved, the change of the gain and the noise coefficient of the amplifier along with temperature fluctuation is reduced, and the stability of the amplifier is improved; according to the low-noise amplifier, an additional temperature compensation circuit module is not needed, the system integration degree is improved, the redundant design of equipment is reduced, and therefore the reliability of the equipment is improved; according to the low-noise amplifier, the high-frequency attenuation module effectively reduces gain fluctuation, and the high-frequency stability of the circuit is improved.

The invention provides a broadband high-efficiency filtering power amplifier and an output matching network design method thereof, and belongs to the technical field of wireless communication. The broadband high-efficiency filtering power amplifier comprises a power amplifier main body and an output matching network connected with the output end of the power amplifier main body; the output matching network structure is based on a three-mode transverse coupling filter; the output matching network comprises a plurality of transmission lines which are directly connected to form a first sub-network, a second sub-network, a third sub-network and a fourth sub-network; the structures of the first and second sub-networks are configured to be equivalent to a [lambda] / 4 transmission line having a harmonic impedance control function. Fundamental wave matching, harmonic control and filtering functions are integrated by adopting an output matching network structure: fundamental wave matching with a steep edge is realized by utilizing a three-mode transverse resonator, secondary harmonic impedance is controlled to a high-efficiency area by adopting an equivalent T-shaped lambda / 4 line, and while wide-bandwidth work is realized, the harmonic control and filtering functions are realized. And high efficiency and excellent harmonic suppression capability are realized.

The utility model discloses a high-power microwave solid-state source module, which comprises an adjustable signal source, an analog electrically controlled attenuation control circuit, a radio frequency switch, a gain power amplifier module, a power divider, a multi-stage power amplifier circuit, a combiner, a power detection circuit and a main control circuit, the input end of the adjustable signal source is connected with an input power supply, and the output end of the adjustable signal source is sequentially connected with the analog electrically-controlled attenuation control circuit, the radio frequency switch, the gain power amplifier module, the power divider, the multi-stage power amplifier circuit and the combiner; the power detection circuit is in coupling connection with the output end of the combiner; the main control circuit is connected with the control end of the adjustable signal source, the control end of the analog electrically controlled attenuation control circuit, the control end of the radio frequency switch, the control end of the gain power amplifier module, the control end of the multi-stage power amplifier circuit and the output end of the power detection circuit. According to the utility model, the problems of low efficiency and inconvenient and unstable frequency and power adjustment of the existing microwave solid-state source are effectively solved.

The invention provides an intelligent audio power amplifier system and a working method thereof. The working method comprises the steps that a dynamic noise suppression module enables an input signal after reverse noise injection to enter a distortion compensation module; a distortion compensation signal is synthesized by using a distortion compensation module; the life cycle parameter self-calibration module calibrates parameters and inputs the parameters to the dynamic noise suppression module and the distortion compensation module; the dynamic noise suppression module is based on an intelligent learning method and adopts a frequency band channel network, a time sequence channel network and a fusion layer; the life cycle parameter self-calibration module provides the temperature and the working time for the dynamic noise suppression module to optimize the time domain channel network and provides the temperature and the working time for the distortion compensation module to update the predistortion coefficient of the dynamic nonlinear distortion model; the output of the dynamic noise suppression module is provided for the distortion compensation module; and the output of the distortion compensation module is fed back to the dynamic noise suppression module. The problems of high-frequency noise interference, nonlinear distortion degradation and insufficient long-term stability are solved at the same time.

The invention is suitable for the technical field of slew rate improvement of operational amplifiers, and provides a slew rate improvement circuit and an operational amplifier. The slew rate increasing circuit comprises a first slew rate triggering module, a first slew rate enhancing module, a second slew rate triggering module and a second slew rate enhancing module, the first slew rate triggering module is electrically connected with the first slew rate enhancing module, and the first slew rate enhancing module is used for being electrically connected with a grid electrode of an upper power tube. The second slew rate triggering module is electrically connected with the second slew rate strengthening module, and the second slew rate strengthening module is used for being electrically connected with the grid electrode of the lower power tube. The first slew rate triggering module and the second slew rate triggering module are additionally arranged, the establishment requirement of the output signal is directly judged according to the difference value between the first voltage and the second voltage, and the corresponding slew rate enhancing module is triggered in real time so as to quickly open the upper power tube or the lower power tube. The loop response delay problem does not exist in the whole process, the establishment time of the output signal can be remarkably shortened, and the output slew rate is more efficiently improved.

The invention relates to the technical field of electronic circuits, in particular to a common-mode rejection circuit which is applied to a differential amplification circuit and comprises a common-mode disturbance rejection circuit and an output common-mode detection circuit. A first input end and a second input end of the output common-mode detection circuit are respectively connected with a first common-mode output end and a second common-mode output end of the differential amplification circuit; the output end of the output common-mode detection circuit is connected with the input end of the common-mode disturbance suppression circuit; a first output end and a second output end of the common-mode disturbance suppression circuit are respectively connected with a first common-mode input end and a second common-mode input end of the differential amplification circuit; the output common-mode detection circuit generates control information according to respective voltages of the first common-mode output end and the second common-mode output end; and the common-mode disturbance suppression circuit adjusts the common-mode voltage of the differential amplification circuit based on the control information, so that common-mode currents flowing in and out of the same common-mode input end are the same, or the common-mode voltage is one half of the voltage of the power supply. Therefore, the voltage disturbance of the common-mode input end is effectively inhibited.

The invention is suitable for the technical field of power electronics, and provides an intelligent management method and system for a power amplifier, and the method comprises the steps: obtaining the output voltage and current of the power amplifier, and determining the real-time load impedance; predicting the junction temperature of the power amplifier according to a coupling thermal model associating the effective thermal resistance with the load mismatch degree; based on the predicted junction temperature and real-time load impedance, stability compensation parameters for maintaining operational stability and pre-distortion parameters for compensating for non-linear distortion are cooperatively determined and adjusted. Through cooperative intelligent management, safety and reliability can be improved, performance maximization is realized, and high fidelity of all working conditions is ensured.

The invention relates to the technical field of power amplifiers, and discloses a GaN broadband radio frequency power amplifier which is applied to a multi-nuclear magnetic resonance system. The GaN broadband radio frequency power amplifier comprises a balance and nonlinear correction module, a preceding stage radio frequency amplification module, a driving stage radio frequency amplification module, a power divider, a radio frequency power amplifier and a power combiner. According to the invention, through the equalization and nonlinear correction module based on frequency identification, the fluctuation of the broadband gain is reduced, through linear correction, the stability of the gain and the stability of the phase are realized when the input power of the working frequency band is changed, and the frequency band coverage, the output power and the efficiency are improved.

The invention discloses a single-power-supply ultra-wideband temperature compensation low-noise amplifier circuit, and belongs to the technical field of radio frequency microwaves. The circuit is mainly composed of a pre-stage low-noise amplifier module, an inter-stage temperature compensation equalization module and a post-stage driving amplifier module. The temperature compensation equalizer module generates differential voltage related to temperature through a three-stage gallium arsenide diode temperature sensing unit, outputs a control signal through an enhanced FET differential amplification circuit, drives a voltage-controlled attenuation equalizer to dynamically adjust the attenuation amount of a radio frequency signal, and achieves gain stability in a frequency band. Through the collaborative design of a blocking capacitor and a divider resistor, the grid bias of an FET switch is strictly limited in a transconductance linear adjustment interval, and the interval covers 80% of the effective range of the threshold voltage of a gallium arsenide FET tube. The circuit is powered by a single power supply + 5V, stable work of each module is ensured through active bias and a power supply filter network, and the circuit is suitable for extreme temperature environments such as high-frequency communication and radar.

The invention discloses a filtering class F power amplifier based on a multimode resonator. The problems of large size and low efficiency caused by common design of a filter and an amplifier are mainly solved. The system comprises an input matching network, a grid electrode direct current feed network, a drain electrode direct current feed network, a transistor, a harmonic suppression network and a filtering matching network, and the input matching network utilizes a pi-shaped circuit to convert standard impedance of an input port into conjugation of optimal source impedance of the transistor; the grid and drain direct-current feed network isolates radio-frequency signals from entering a direct-current power supply and enables the transistor to work at a proper quiescent working point; the harmonic suppression network shapes the drain voltage and current of the transistor; the filtering matching network can control harmonic impedance and participate in matching, so that the drain electrode of the amplifier can reach the optimal load impedance. According to the invention, the loss generated by device connection is obviously reduced, the advantage of low complexity is shown, and the method is suitable for being applied to communication systems such as base stations and radars.

The invention discloses a wide dynamic underwater sound acquisition method suitable for an underwater glider and a hydrophone, and the method comprises the steps: configuring a unique hydrophone into four parallel band-pass filtering and amplifying circuits, each band-pass filtering and amplifying circuit having different acquisition frequency bands; after the underwater glider enters water, underwater sound collection is carried out based on the only installed hydrophone, and underwater sound signals of four collection frequency bands are collected at the same time through four parallel band-pass filtering and amplifying circuits. Through four paths of differentiated gains and frequency segmentation, the wide dynamic full frequency band can be covered, the dynamic range is improved, a single hydrophone integrates four channels, cables and installation space among multiple devices are saved, and the underwater glider compact layout is adapted; the channels are activated on demand, the total power consumption can be reduced, and the endurance time is prolonged. Under the conditions of low power consumption and limited volume of the underwater glider, wide dynamic range signal acquisition can be realized, and signals can be processed in real time.

The invention discloses a temperature compensation circuit, a power amplifier and a radio frequency front-end module. The temperature compensation circuit comprises a temperature compensation module, a current source module and a control module. The temperature compensation module is used for outputting a first temperature compensation voltage under the condition that the environment temperature is smaller than or equal to a first temperature threshold value; the current source module is connected between the temperature compensation module and the output port and is used for converting the temperature compensation voltage output by the temperature compensation module into control current; the current source module is provided with at least two current adjusting gears, and the control module is connected with the current source module. When the first temperature compensation voltage output by the temperature compensation module is in positive correlation with the environment temperature, and the environment temperature is smaller than or equal to a first temperature threshold value (namely, the low-temperature environment), the control current is reduced accordingly, so that the offset signal of the compensated power amplifier is synchronously reduced, and the offset signal of the power amplifier is synchronously reduced. The working gain of the power amplifier in a low-temperature environment can be reduced, so that the durability of the power amplifier is improved.

A push-pull source follower circuit includes a main source follower, a first biasing circuit, and a second biasing circuit. The main source follower includes a first transistor and a second transistor between a first power rail and a second power rail, where the first transistor and the second transistor include an N-type transistor and a P-type transistor. The first biasing circuit programs a bias current of the main source follower through generating a first bias voltage of the first transistor. The second biasing circuit programs an output mean voltage of the push-pull source follower circuit through generating a second bias voltage of the second transistor. The bias current and the output mean voltage are programmed independently.

A bias circuit of a power amplifier includes a first part circuit, a second part circuit and a power supply, in which the power supply is connected with a power supply end of the first part circuit; two ends of the first part circuit are connected in parallel with two ends of the second part circuit, and after parallel connection one end of a parallel circuit is connected with a gate of the first transistor of the power amplifier in a signal amplification circuit; the first part circuit is configured to provide a first bias voltage, and the second part circuit is configured to provide a second bias voltage; the two bias voltages are superimposed to provide a stable bias voltage; and an impedance of the bias circuit is in a preset range of the impedance.

Power amplifier modules (PAMs) having topside cooling interfaces are disclosed, as are methods for fabricating such PAMs. In embodiments, the method includes attaching the RF power die to a die support-surface of a module substrate. The RF power die is attached to the module substrate in an inverted orientation such that a frontside of the RF power die faces the module substrate. When attaching the RF power die to the module substrate, a frontside input / output interface of the RF power die is electrically coupled to corresponding substrate interconnect features of the module substrate. The method further includes providing a primary heat extraction path extending from the transistor channel of the RF power die to a topside cooling interface of the PAM in a direction opposite the module substrate.

A power amplifier comprises a first transistor, a second transistor, a first emitter follower, a first bias resistor, and coupling circuitry configured to couple the first bias resistor to a base of the first transistor, the first bias resistor, the second bias resistor, and an emitter of the first emitter follower at a first node, and a base of the first emitter follower to the second transistor.

The application provides a timing protection power supply device and a power supply method for a gallium nitride power amplifier. The structure of a negative voltage neutralization circuit is arranged as the structure of the application, so that a fixed positive voltage signal can be obtained. The negative voltage generated by a negative voltage generation circuit is neutralized with the fixed positive voltage signal in the negative voltage neutralization circuit. When the negative voltage generation circuit outputs a normal negative voltage, the neutralized signal is at a low level. When the negative voltage generation circuit outputs a positive voltage signal, the neutralized signal is at a high level. The neutralization of the negative voltage signal and the positive voltage signal is used to determine whether the negative voltage signal meets the requirements. Compared with a traditional negative voltage discrimination method, the negative voltage discrimination method of the application has a simpler structure and is not affected by external environment, and has high stability.

The embodiment of the invention discloses a power amplifier circuit, a radio frequency chip and electronic equipment. The power amplifier circuit comprises at least two stages of cascaded power amplifiers, the low-frequency resonance network comprises a first capacitor, a second capacitor and a first inductor; the first capacitor is coupled between a power supply end and a grounding end; the second capacitor is coupled between the first end of the power amplifier and the grounding end; the first inductor is coupled between the first capacitor and the second capacitor; the first capacitor comprises a decoupling capacitor.

The invention discloses a detection and protection circuit system of an amplifier, which is characterized in that a protection circuit system consisting of an over-temperature protection circuit (OTP), an over-current protection circuit (OCP), an over-voltage protection circuit (OVP), an electromagnetic interference (EMI) protection circuit and an ESD protection circuit is used, and a band-gap reference circuit BG and the over-temperature protection circuit are connected in series to form a whole which is connected in parallel with a core of the amplifier; meanwhile, the overcurrent protection circuit is connected to the output end of the amplifier in parallel, the overvoltage protection circuit is connected with the electromagnetic interference protection circuit in series and arranged at the input end of the amplifier, and the ESD protection circuit is connected with the power port in series. The over-temperature protection circuit mainly aims at an output heat source power tube and an input heat source differential pair. The over-current protection is to protect the output power tube, and if the over-temperature protection is triggered, the FLAG outputs an over-temperature protection signal. And the ESD protection is used for protecting electrostatic discharge of IO and POWER ports.

The invention provides a driving circuit of a chopping switch circuit and electronic equipment, the driving circuit of the chopping switch circuit comprises a floating power supply generation circuit and a level shift circuit which are electrically connected with the chopping switch circuit, and the driving circuit provides port voltage bias for the chopping switch circuit through the floating power supply generation circuit. The floating power supply and the floating ground change along with the common-mode change of an input signal, so that the conduction impedance change and the threshold voltage change caused by the common-mode level change can be reduced; meanwhile, a power supply and a reference ground are provided for the level shift circuit, so that the level shift circuit can convert an originally constant high-amplitude clock signal into a clock signal changing along with the input common-mode level, and the amplitude of the clock signal can be kept at a constant and low value; therefore, low noise injection and clock feed-through can be realized under the condition that the conduction impedance and the threshold voltage are relatively stable, so that the precision and the stability of the circuit are improved, and the signal quality is improved.