293results about "Amplifier protection circuit arrangements" patented technology

The invention discloses a high-voltage power amplifier with an over-temperature and over-current protection circuit, and relates to the technical field of integrated circuits. The high-voltage operational amplifier comprises a high-voltage operational amplifier core unit and a self-adaptive protection circuit unit, the high-voltage operational amplifier core unit comprises a rail-to-rail input stage, a gain amplification stage and an AB type push-pull output stage which are sequentially cascaded, and the AB type push-pull output stage comprises a PMOS upper power tube and an NMOS lower power tube; the self-adaptive protection circuit unit comprises a PMOS (P-channel Metal Oxide Semiconductor) current-limiting protection circuit, an NMOS (N-channel Metal Oxide Semiconductor) current-limiting protection circuit and an over-temperature protection circuit; the PMOS current-limiting protection circuit is used for generating a high-voltage domain over-current control signal when the power tube on the PMOS is over-current; the NMOS current-limiting protection circuit is used for generating a low-voltage domain overcurrent control signal when the NMOS lower power tube is in overcurrent; the over-temperature protection circuit is used for generating high-voltage domain over-temperature turn-off signals and low-voltage domain over-temperature turn-off signals when the amplifier is over-temperature; and finally, carrying out logic synthesis on the corresponding over-current control signal and the over-temperature turn-off signal to generate a gate clamping signal.

The utility model relates to a static working parameter automatic adjusting circuit of a GaN power amplifier and a road side unit. The static working parameter automatic adjusting circuit comprises a control module, an adjustable voltage generation module, a static adjusting module, a current detection module and a power amplifier. The current detection module detects the real-time working current of the power amplifier and outputs a current feedback signal; the control module outputs a corresponding control signal according to the current feedback signal; the adjustable voltage generation module generates a variable voltage according to the control signal; the static adjusting module generates an adjusting signal according to the variable voltage so as to adjust static working parameters of the power amplifier. According to the utility model, the static working parameters of the GaN power amplifier can be accurately and automatically adjusted according to the real-time working current of the GaN power amplifier, the accuracy and reliability of adjustment can be ensured, error factors caused by circuit devices can be avoided, and the problem that the grid voltage of the GaN power amplifier needs to be independently adjusted can be solved.

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 invention discloses a Ka-band 2000W solid-state power amplifier, which relates to the field of power amplifiers, and comprises a Ka monitoring and pre-stage power amplifier, a Ka final-stage power amplifier and a Ka high-power synthesis network, the Ka monitoring and pre-stage output end is in flexible connection with the eight Ka last-stage power amplifiers, and the Ka last-stage power amplifiers are in hard connection with the Ka high-power synthesis network through waveguides. A solid-state system is adopted for design, a domestic GaN solid-state power amplifier chip is utilized for synthesis, the power amplifier adopts a low-voltage working mode, the power chip is long in service life, the linear index of the power amplifier is good, and the power amplifier is different from the defects that a vacuum tube power amplifier is large in size and weight, has breakdown risks during high-voltage working and cannot respond to emergency scenes immediately. The Ka-band high-power amplifier is a development trend of a Ka-band high-power amplifier, and has the advantages of high output power and convenience in maintenance.

The invention relates to the technical field of radio frequency circuits, and provides a protection circuit, method and module of a radio frequency front-end circuit and a radio frequency device.The protection circuit comprises a bidirectional power detection module which is connected in series in a link from a power amplifier of the radio frequency front-end circuit to a radio frequency output end; the comparison trigger module is connected with the bidirectional power detection module; and the power control module is connected with the comparison trigger module and the power amplifier. The bidirectional power detection module detects forward power and reverse power of a link to form a first signal and a second signal, and the comparison trigger module performs comparison processing according to the first signal and the second signal and generates a trigger signal when the output power is too large or the standing-wave ratio is too large. And the power control module adjusts the output power of the power amplifier according to the trigger signal, so that negative effects on circuit elements caused by overlarge output power or overlarge standing-wave ratio are avoided, the circuit elements are protected from being damaged, high-precision protection on the radio frequency front-end circuit is realized, and the safety and the reliability are improved.

Apparatus and methods for power amplifier signal limiting are disclosed. In certain embodiments, a front-end system includes a low noise amplifier that amplifies a radio frequency receive signal during a receive frame, a power amplifier that amplifies a radio frequency transmit signal during a transmit frame, and a signal limiter operable to limit a signal power of the power amplifier in an attenuating mode. The signal limiter includes a radio frequency detector configured to generate a detection signal based on detecting a power level of the radio frequency transmit signal, and a latch that locks the signal limiter in the attenuating mode in response to activation of the detection signal. The latch is reset by a bias signal of the power amplifier that is activated during the transmit frame and deactivated during the receive frame.

A semiconductor device package includes an interconnect structure with a first surface having at least one die thereon and a second surface that is opposite the first surface and is configured to be coupled to an external device. A protective structure on the first surface of the interconnect structure exposes a heat dissipating surface facing away from the interconnect structure in one or more directions. Related devices and fabrication methods are also discussed.

Certain aspects of the present disclosure generally relate to electronic circuits and, more particularly, to techniques and apparatus for signal amplification. One example apparatus generally includes: a current sensor configured to sense a current associated with an amplifier; and a voltage sensor configured to sense a voltage associated with the amplifier. The apparatus may also include a logic circuit configured to: detect a first over-current condition associated with the amplifier based on the current; detect a first over-voltage condition associated with the amplifier based on the voltage; and adjust an amplification gain to yield a first adjusted gain level for an input signal based on detection of the first over-current condition and the first over-voltage condition, wherein the amplifier is configured to amplify the input signal based on the first adjusted gain level.

The invention discloses a clamping circuit of an error amplifier, which belongs to the field of analog integrated circuits and comprises an error amplifier EA, a low-voltage clamping circuit and a high-voltage clamping circuit. The error amplifier EA comprises a first-stage operational amplifier, the non-inverting input end of the first-stage operational amplifier is connected with feedback voltage VFB, the inverting input end of the first-stage operational amplifier is connected with reference voltage VREF, and the first-stage operational amplifier outputs VC voltage; the error amplifier EA is used for amplifying the change of the feedback voltage VFB; when the VFB is reduced or increased, the corresponding low-voltage clamping circuit or the high-voltage clamping circuit works, the output VC of the first-stage operational amplifier is clamped to the low-voltage clamping limit VclampL or the high-voltage clamping limit VclampH, the VC is controlled to be within a certain range, then clamping of the output current IEA of the error amplifier EA is achieved, quick response and stable adjustment of a loop are achieved, and meanwhile the function of protecting the circuit is achieved.

The invention discloses a high-power modular radio frequency power amplifier capable of realizing wide-range power regulation. The high-power modular radio frequency power amplifier comprises a radio frequency load RL and m power amplification modules, the m power amplification modules are connected in parallel at a direct current side and are connected with an adjustable direct current bus voltage source; and the m power amplification modules are connected in parallel at the alternating current side and are superposed at the alternating current side. The output current of all the power amplification modules is transmitted to the radio frequency load RL; each power amplification module comprises a high-frequency switch power amplification unit, an LCL resonance network and an isolation transformer. According to the invention, through the configuration of the number of the power amplification modules and the adjustable cooperative control of the DC bus voltage source, the continuous adjustment of the output power is realized, meanwhile, the stable operation of each power amplification module under the resonance condition is ensured, the zero-voltage switching state is maintained, and the overall operation efficiency of the architecture and the adaptability of the radio frequency load are effectively improved.

The present disclosure relates to a radio frequency (RF) module with a protection structure for enhanced ruggedness and reliability. The disclosed RF module includes a power amplifier (PA), a bias circuit configured to provide a direct current (DC) supply to the PA, and a protection structure coupled between the PA and the bias circuit. Herein, the protection structure is configured to generate a detector voltage by sensing reverse power reflected from an antenna back to at least the PA. The protection structure is configured to control the bias circuit to reduce the DC supply to the PA based on a comparison result between the detector voltage and a threshold voltage.

The invention discloses an overload protection method for an audio power amplifier, and relates to the field of audio power amplifiers. According to the invention, the instantaneous output amplitude signal of the power amplifier is divided by the preset overload threshold impedance to obtain the reference current dynamically changing along with the signal, and the actual output current is compared with the reference current in real time, so that the protection criterion is converted from a fixed current threshold to an adaptive impedance threshold; therefore, real-time identification and turn-off of a low-impedance abnormal load are realized, and normal output of a high-peak-factor audio signal is compatible.

The present disclosure relates to power amplifier circuitry with temperature-controlled biasing and protective shutdown based on die temperature. A first amplifier die and second amplifier die each have their own power amplifiers and temperature-sensing elements. An amplifier controller die controls both power amplifier dice, generating a bias current that can be coupled to either power amplifier die to activate the power amplifier of one or the other die. The bias current magnitude is updated in response to decreased temperature-dependent voltage from the inactive die which is at an average temperature of both dice. A switch control logic also selects the temperature-dependent voltage of the temperature-sensing element of the active die to input to a comparator that outputs a thermal shutdown signal if the temperature of the active die approaches a damaging level, and the switch control logic controls opening of switches connected to the bias output terminal to prevent damage.

The invention discloses a protection circuit of a power amplifier, the power amplifier and a power amplification system, and relates to the field of circuits, a detection module can judge whether the power of an input port of the power amplifier is larger than or equal to a preset value or not, and when the power of the input port of the power amplifier is larger than or equal to the preset value, a preset signal is output; therefore, the bias adjusting module can control the power tube to be turned off by controlling the bias current output by the bias circuit to be reduced, and over-input power protection of the power amplifier is achieved. The preset value which is a judgment reference of the detection module can be flexibly adjusted in a small-step mode according to requirements, the flexibility and the application range of the whole protection circuit are improved, and flexible adjustment of a critical protection point during over-input power protection is achieved.

A method for use with an acoustic system (referred to as a plant in control theory) (125) including a loudspeaker set (120), the method comprising obtaining an input audio sample (r n ) and a measured current (m n-d ) drawn by the loudspeaker set, and for a current time step, using a state space model of the loudspeaker set to generate a state vector (x n ) and a model-based estimated current (y n ), generating a predicted current (y n ) for a next time step based on the state vector (x e,n+1 ), generating a replacement audio sample (u n ) based on the state vector (x L,n ) for the current time step, generating a feedback signal (f n-d ) that contributes to the generation of the state vector (x n-d ) for a next time step based on the measured current (m n+1 ) and a time-aligned model-based estimated current (y n ), and generating an output audio sample (u n ) for the current time step, wherein when the predicted current (y e,n+1 ) is higher in amplitude than a threshold (I max ), the output audio sample (u n ) is either the input audio sample (r n ) or the replacement audio sample (u L,n ) for the current time step.

Methods and apparatus are provided. In an example aspect, an amplifier protection circuit is provided. The amplifier protection circuit comprises an input for receiving a signal from a first amplifier, and an isolation circuit between the input and an output of the amplifier protection circuit. The isolation circuit is configured to sense a backward signal propagating from the output of the amplifier protection circuit towards the input to provide a sensed signal, and to provide at least one cancellation signal based on the sensed signal to at least partially cancel the backward signal.

A power amplifier (100) includes an input end (RFIN), an output end (RFOUT), a first amplification circuit (PA1), a second amplification circuit (PA3), a bias circuit (BIAS3), a current detection circuit (110), and a first protection circuit (120). The first amplification circuit (PA1) includes a first signal input end (IN1) coupled to the input end (RFIN) and a first signal output end (OUT1). The bias circuit (BIAS3) outputs a bias current (IBIAS3) to the second amplification circuit (PA3). The current detection circuit (110) generates a digital control signal (VOCP) according to the bias current (IBIAS3). The first protection circuit (120) selectively reduces the radio frequency signal (RF) input to the first signal input end (IN1) according to the digital control signal (VOCP).

An integrated resistive element adapted to be configured as an integrated sensing unit and electronic apparatus including the same. The integrated resistive element in an embodiment may include a plurality of resistive segments including a first portion disposed in or on a first well formed in a substrate and a second portion disposed in or on a second well formed in the substrate. The second portion is for being electrically coupled between a first terminal and a sensing terminal of the integrated resistive element. The first portion is for being electrically coupled between the sensing terminal and a second terminal of the integrated resistive element. In an embodiment, the first well is configured to be biased from a first well bias circuit. In an embodiment, the second well is configured to be biased from a second well bias circuit.

An apparatus comprising; an amplifier (308) having an amplifier input and an amplifier output; a power stage (PSI) having a power stage input and a power stage output, the power stage input coupled to the amplifier output; and an overcurrent protection circuit (402, 404) coupled to the power stage, the overcurrent protection circuit having an overcurrent threshold control input coupled to the amplifier.

An output control circuit (1), a controller (110), and an air conditioner (120). The output control circuit (1) comprises: a signal input end (in); a first amplification module (10), a first input end of which is connected to the signal input end (in); a first power module (40), a first input end of which is connected to an output end of the first amplification module (10), and a second input end of which is connected to a first direct-current voltage source (VDD1); a first resistor (R1), a first end of which is connected to an output end of the first power module (40); a second amplification module (20), a first input end of which is connected to the first end of the first resistor (R1), and a second input end of which is connected to a second end of the first resistor (R1); a switch module (30), which is respectively connected to the second end of the first resistor (R1), an output end of the second amplification module (20), and a second input end of the first amplification module (10); and a signal output end (out), which is connected to the second end of the first resistor (R1), and is used for outputting various types of output signals. The output control circuit can be controlled by means of software, so as to further realize intelligent and remote configuration thereof, and thereby realizing the switching of a signal output function of a controller, and improving the universality, safety and reliability of the output control circuit.

The invention provides a radio frequency microwave power amplifier over-standing wave protection system and a protection method thereof. The system comprises a bidirectional coupling module, a dual-path detection module, a signal processing module and a protection execution module, wherein the bidirectional coupling module is used for collecting a forward radio frequency power analog signal and a reverse radio frequency power analog signal; the dual-path detection module is used for generating a forward detection voltage analog signal based on the forward radio frequency power analog signal and generating a reverse detection voltage analog signal based on the reverse radio frequency power analog signal; the signal processing module is used for generating an actual standing-wave ratio based on the forward detection voltage analog signal and the reverse detection voltage analog signal, and generating a control protection signal according to the actual standing-wave ratio; and the protection execution module is used for performing power-off protection on the to-be-protected radio frequency microwave power amplifier based on the control protection signal. The problem that an existing radio frequency microwave power amplifier over standing wave protection scheme cannot be suitable for complex application scenes can be solved.

The application relates to the technical field of wireless communication, in particular to an AI-based radio frequency amplifier protection control method and device and a storage medium. The method comprises the following steps: identifying a heat dissipation state according to the temperature and humidity in a cabinet and the power amplifier junction temperature, extracting equipment performance degradation features according to the power amplifier nonlinear distortion coefficient and the DPD iteration convergence number, and comprehensively determining a basic risk level; determining a dynamic reflected power tolerance threshold based on a historical reflected power sequence and a service type mixed entropy; determining a dynamic power backoff amount according to the output power fluctuation feature, the carrier aggregation imbalance degree and the basic risk level in an analysis period; fusing the dynamic reflected power tolerance threshold, the dynamic power backoff amount and the reflected power, and performing reflected power anomaly prediction and power suppression control; extracting resource allocation features in the analysis period, and optimizing the power suppression control process. The application significantly improves the working reliability, service life and network service quality in a harsh environment.

The invention provides an amplifier circuit, a radio frequency chip and electronic equipment. The amplifier circuit comprises a multi-stage power amplifier and a protection circuit, wherein the multi-stage power amplifier is configured to receive a radio frequency input signal, perform multi-stage amplification on the radio frequency input signal and then output the radio frequency input signal; and the protection circuit is connected with the multi-stage power amplifier and is configured to receive and compare the power supply voltage and the reference voltage, and adjust the power supply voltage of at least one driving stage in the multi-stage power amplifier based on the comparison result of the power supply voltage and the reference voltage, so as to improve the reliability and the service life of the amplifier circuit.

The application provides a limiter circuit, which comprises a plurality of transmission lines connected in series, one end of the transmission lines is used as an input end of a radio frequency signal, the other end of the transmission lines is connected with an input end of an amplifier, and an output end of the amplifier is used as an output end of the radio frequency signal; a limiter branch is connected between adjacent transmission lines and the amplifier in sequence, and the parasitic capacitance of each limiter branch is equal; a limiter bias circuit is electrically connected with each limiter branch, and is used for making the opening power voltage of each limiter branch equal. According to the application, the size of each limiter branch is adjusted according to the uneven distribution of current, so that the current density of each limiter branch is balanced, and the insertion loss and impedance matching can be effectively improved, and the bandwidth is improved under the premise of realizing the current density balance and improving the power protection ability.

A power amplifier capable of appropriately suppressing an output voltage according to a temperature is provided. A first member including a semiconductor region is joined to a second member including a semiconductor region of a compound semiconductor system on a first surface of the first member. The second member includes an amplification circuit including a semiconductor element of a compound semiconductor system, and a plurality of clamp diodes connected in multiple stages and inserted between an output port of the amplification circuit and a ground line. The first member includes a switch connected between a lead-out point that is a point halfway through the plurality of clamp diodes connected in multiple stages and the ground line, a temperature sensor, and a switch control circuit that performs on-off control of the switch based on a measurement result of the temperature sensor. The lead-out point is connected to the switch via a path including an inter-member connection wiring composed of a metal pattern disposed on an interlayer insulating film from the first surface of the first member to a surface of the second member, or a path crossing an interface at which the first member and the second member are joined.

In the present invention, a high-frequency signal is input into a first transistor. A plurality of second transistors are cascode-connected to the first transistor. A bias circuit supplies a bias to each of the plurality of second transistors. A power supply wiring applies a voltage-variable power supply voltage to a cascode connection circuit including the first transistor and the plurality of second transistors. The bias circuit includes at least one voltage regulator, and supplies a bias voltage, which is generated on the basis of the voltage of the power supply wiring and the voltage of a voltage control node of which the voltage is controlled by the voltage regulator, to at least one of the plurality of second transistors.

A transmitter includes an analog transmission circuit, a power amplifier, a voltage detector, a comparator, and a control circuit. The analog transmission circuit is configured to provide a first gain to a first analog signal, so as to generate a second analog signal. The power amplifier is configured to provide a second gain to the second analog signal, so as to generate an output signal to an antenna. The voltage detector is configured to detect a voltage level of the second analog signal. The comparator is configured to generate an indication signal according to the voltage level and a reference level. The control circuit is configured to adjust the first gain of the analog transmission circuit according to the indication signal.

The invention relates to the technical field of audio amplifiers, in particular to an audio amplifier circuit safety protection method and system.The circuit safety protection method and system comprise the steps that an audio input source and system power-on are included, and after the audio input source receives audio, the audio is transmitted to an audio power amplification module; the audio power amplification module amplifies the audio power and then the audio power passes through the over-current detection module. According to the audio amplifier circuit safety protection method and system, an integrated and intelligent audio amplifier safety protection solution is provided, and compared with a traditional scheme only adopting a disposable fuse, the audio amplifier circuit safety protection method and system have the double functions of over-temperature protection and over-current protection, can cope with more comprehensive fault scenes, are more comprehensive in protection, and are more reliable in protection. An electronic circuit is adopted for real-time monitoring, the response speed reaches the millisecond level and is far higher than that of a traditional fuse, faults can be cut off rapidly, and expensive core power devices are prevented from being burnt out fundamentally.

Embodiments of a re-driver and a resistance unit for a re-driver are disclosed. In an embodiment, a resistance unit for a re-driver comprises at least one resistor connected to an input / output of the re-driver, at least one switch connected in series to the at least one resistor, and a voltage regulator connected to the at least one switch and configured to generate a termination voltage for the at least one switch. Using the voltage regulator can avoid large voltage jumps at the input / output to keep the connected device safe, instead of grounding the at least one resistor.