14 results about "Gain compression" patented technology

The invention belongs to the technical field of semiconductors and packaging of the semiconductors, and particularly relates to a directional liquid cooling-graded rollback dual-band radio frequency receiving and transmitting integrated component, which realizes integrated integration of devices, heat dissipation and wiring through a multi-layer glass-based packaging substrate and is matched with a closed grounding TGV fence to improve dual-band electromagnetic compatibility. The first temperature-sensitive TGV, the second temperature-sensitive TGV and the first power supply branch current sampling resistor are utilized to form a combined heat and power monitoring system, and a directional gradient type copper-filled heat-conducting TGV is combined to realize directional dredging of heat flow. The double-acting-element micro-jet liquid cooling structure controls the main jet impact cavity and the offset auxiliary jet cavity through the adjustable micro throttle valve, and targeted cooling and thermal migration interception are achieved. And the controller is used for judging the over-drive thermal migration of the driving stage, the overheating of the final stage and the overload working condition of the full link based on the temperature, the current and the gain compression amount, adjusting the cooling flow in a linkage manner, and executing graded power back-off and smooth recovery on the first power supply branch and the second power supply branch, so that the radio frequency performance is ensured, and the reliability and the working condition adaptability of the high-power component are improved at the same time.

The invention relates to a manufacturing method of a power amplifier for improving power back-off efficiency, which belongs to the technical field of radio frequency microwave circuits, and comprises the following steps: step 1, based on load characteristics of an active device, determining an optimal efficiency impedance point under linear output power as optimal impedance of amplifier design; step 2, pulling out the determined optimal impedance by using a load pulling technology or LOADPULL, and drawing the optimal impedance on an SMITH original drawing; 3, based on the optimal impedance obtained through traction, low-loss impedance matching is achieved through the equal Q matching technology, loss and bandwidth are compatible, and impedance change and frequency band shaping are completed; 4, a two-stage or multi-stage amplification structure is adopted, and nonlinear compensation is realized by controlling grid voltages of front-stage and back-stage active devices and utilizing front-stage and back-stage gain compression and expansion characteristics; the method has the beneficial effects that the linear output power optimal efficiency impedance point is selected as the optimal impedance of the amplifier design, and the amplifier maintains higher linear output power and has higher rollback efficiency.

The embodiment of the utility model provides a low-noise amplifier, a radio frequency front-end module and electronic equipment. The low-noise amplifier comprises a signal input end, a signal output end, an amplifying circuit, a first switching circuit and a first adjusting circuit, the first end of the amplifying circuit is connected with the signal input end, and the second end is connected with the signal output end; the first switching circuit and the first adjusting circuit are connected in series and connected with the first end of the amplifying circuit. When the first switching circuit is switched to the connected state, part of power of a radio frequency signal input by the signal input end is discharged through the first adjusting circuit, and the low-noise amplifier can be prevented from generating gain compression; when the first switching circuit is switched to the off state, noise introduced by the first adjusting circuit can be prevented from entering the amplifying circuit to be amplified, and it is guaranteed that the output signal has the high signal-to-noise ratio.

The invention discloses a high-linearity current multiplexing two-stage low noise amplifier, belongs to the field of radio frequency integrated circuits, and aims to solve the problem of gain compression distortion caused by grid voltage instability of a second-stage amplifier tube under high-voltage and large-current working conditions. An auxiliary transistor M3 is additionally arranged beside a main amplification transistor M2, and a cross coupling connection structure is adopted, so that a dynamic voltage balance mechanism is constructed. When a large signal is input to cause grid voltage fluctuation, the structure automatically regulates and controls the conduction state of the M3 based on a voltage difference threshold value, and a passive real-time voltage stabilizing loop is formed. The inter-stage resonance network suppresses the parasitic effect through a shunt capacitor dominant capacitance design, a source negative feedback inductor is accurately matched with input impedance, and the integrity of broadband signals is cooperatively guaranteed. The cross coupling topology breaks through the contradiction between high gain and high linearity on the premise that power consumption is not increased, and a low-noise and high-stability signal amplification solution is provided for satellite navigation and a base station radio frequency system.

The invention relates to the technical field of differential amplifiers, in particular to a high-linearity differential low-noise amplifier. Comprising a positive half main branch, a negative half main branch, a positive half auxiliary branch, a negative half auxiliary branch, a positive input matching module, a negative input matching module, a positive output matching module and a negative output matching module. The positive output matching module is connected with the negative half auxiliary branch; the positive output matching module is connected with the positive half main branch; the front half main branch is connected with the front half auxiliary branch; the positive input matching module is connected with the positive half main branch; the negative output matching module is connected with the negative half auxiliary branch; the negative output matching module is connected with the positive half main branch; the negative half main branch is connected with the negative half auxiliary branch; and the negative input matching module is connected with the negative half main branch. According to the invention, the third-order intermodulation amount is eliminated through the derivative superposition technology, so that additional noise brought by the auxiliary branch is compressed by the gain of the main branch, and noise deterioration is effectively slowed down.

This application relates to an optimization method for the output matching network of a power amplifier. The method includes: performing load-pull simulations on the target power amplifier transistors at multiple frequencies within the design bandwidth based on a preset gain compression point, obtaining isopleth curves of various performance indicators; obtaining the optimal load impedance and the optimal impedance domain related to the target performance indicators based on the isopleth curves of various performance indicators; evaluating the performance of the current output matching network based on the optimal load impedance and the optimal impedance domain, obtaining an error value based on the output matching impedance; and iteratively optimizing the component parameters of the output matching network using an optimization algorithm based on the optimization objective of the output matching network until the error value meets a preset termination condition, obtaining the optimized result of the output matching network. This method can eliminate the need for repeated harmonic balance simulations during the optimization process, improving the optimization efficiency of the power amplifier output matching network.

The application belongs to the technical field of semiconductor and its packaging, and particularly relates to a directional liquid cooling-grading back-off dual-frequency-band radio frequency receiving and transmitting integrated assembly. The device, heat dissipation and wiring are integrated through a multilayer glass-based packaging substrate, and the dual-frequency-band electromagnetic compatibility is improved by cooperating with a closed ground TGV fence. A thermoelectric combined monitoring system is formed by using a first temperature-sensitive TGV, a second temperature-sensitive TGV and a first power supply branch current sampling resistor, and heat flow is directionally dredged by combining a directional gradient copper-filled heat-conducting TGV. A double-acting sub-micro liquid cooling structure controls a main jet impact cavity and a biased auxiliary jet cavity through an adjustable micro throttle valve, so that targeted cooling and heat migration interception are realized. A controller discriminates drive stage overheat migration, end stage self-overheating and full-link overload working conditions based on temperature, current and gain compression amount, and links and adjusts cooling flow and executes grading power back-off and smooth recovery on the first and second power supply branches, so that the radio frequency performance is ensured, and the reliability and working condition adaptability of the high-power assembly are improved.

The application discloses a kind of radio frequency device digital twin modeling methods based on transfer function. Cubic spline interpolation algorithm is used to obtain the characteristic curve of radio frequency device with continuous change of working frequency of radio frequency signal, and AM-AM curve and AM-PM curve with continuous change of input power of radio frequency signal at each discrete frequency point. Linear transfer function and nonlinear transfer function of radio frequency device are constructed according to the above curves. According to the input signal power of radio frequency device, the working area of radio frequency device is judged, and different transfer functions or fixed parameters are called to obtain intermediate signals. Complex noise is generated, and the same processing method as the input signal of radio frequency device is used for complex noise. Finally, the output signal is obtained. The application realizes the coupling correlation of noise figure and gain compression of radio frequency device.

This invention discloses a method, apparatus, device, and storage medium for suppressing wind noise in audio devices, relating to the field of audio signal processing technology. The method includes: acquiring an input audio signal and performing frequency division processing to separate multiple frequency band signals, including at least low-frequency and high-frequency signals; performing independent dynamic range control processing on different frequency band signals; extracting wind noise characterization features of the high-frequency signals, determining the wind noise scenario based on device drive strength information, and adaptively updating the dynamic range control parameters corresponding to the high-frequency signals based on the determination results; monitoring the gain compression state of each frequency band signal after dynamic range control processing and determining the gain differences between frequency bands; and recombining the frequency band signals after dynamic range control processing and gain coordination processing into a full-band output signal, effectively suppressing high-frequency wind noise while preserving the dynamic integrity and overall naturalness of the mid-to-low frequency music content as much as possible.

The application relates to a power amplifier manufacturing method for improving power backoff efficiency, and belongs to the technical field of radio frequency microwave circuits, and comprises the following steps: step 1: based on the load characteristics of an active device, the optimal efficiency impedance point under linear output power is determined as the optimal impedance of amplifier design; step 2: the determined optimal impedance is pulled out by using a load pulling technology or LOADPULL, and is drawn on a SMITH chart; step 3: based on the optimal impedance obtained by pulling, an equal Q matching technology is adopted to realize low-loss impedance matching, compatibility of loss and bandwidth, impedance variation and frequency band shaping are completed; step 4: a two-stage or multi-stage cascade amplification structure is adopted, the gate voltages of front and rear active devices are controlled, and nonlinear compensation is realized by using gain compression and expansion characteristics of the front and rear stages; the application has the beneficial effects that the optimal efficiency impedance point under linear output power is selected as the optimal impedance of amplifier design, the amplifier maintains higher linear output power, and has higher backoff efficiency.

The application relates to an adjustable adaptive bias circuit for a power amplifier, which comprises a bias voltage generating circuit and a positive feedback voltage dividing circuit; the bias voltage generating circuit generates a bias voltage input to the positive feedback voltage dividing circuit, and the bias voltage input to the positive feedback voltage dividing circuit is adjusted through an adjustable current source in the bias voltage generating circuit; the positive feedback voltage dividing circuit forms a positive feedback mechanism through voltage division on a gate bias voltage Vcs input to the power amplifier, which automatically increases with the increase of input power, so that the power amplifier maintains high transconductance and gain at large power output, thereby inhibiting the gain compression phenomenon and realizing adaptive bias control. The circuit structure is simple, can realize real-time sensing of output power change and adaptive adjustment of the size of the bias voltage, dynamically enhances the bias voltage with the increase of the output power, thereby effectively offsets the gain compression effect, and maintains high and stable gain output in a wide power range.

The invention discloses an anti-interference receiving front-end circuit, which comprises a current mode anti-interference transconductance amplifier, a down-conversion switching network and a first-order RC (Resistance-Capacitance) filtering transimpedance amplification network, the current mode anti-interference transconductance amplifier is used for converting a radio frequency input voltage signal into a radio frequency current; the down-conversion switching network is used for converting the radio-frequency current into an intermediate-frequency current; the first-order RC filtering transimpedance amplification network is used for filtering high-frequency clutter components in the intermediate-frequency current, converting the intermediate-frequency current into intermediate-frequency voltage and outputting the intermediate-frequency voltage; the current mode anti-interference transconductance amplifier adopts a current multiplexing active negative feedback amplifier structure, the down-conversion switch network adopts a passive double-balance frequency conversion switch circuit, and the first-order RC filtering transresistance amplification network comprises a differential operational amplifier and a first-order RC low-pass filter. According to the invention, when the adjacent channel interference power reaches 0dBm, the receiving front end can obtain gain compression less than 3dB and a noise coefficient superior to 10dB, so that the anti-interference capability is greatly improved.

The invention discloses a radio frequency device digital twin modeling method based on a transfer function. A cubic spline interpolation algorithm is adopted to obtain a characteristic curve of a radio frequency device which continuously changes along with the working frequency of the radio frequency signal, and an AM-AM curve and an AM-PM curve which continuously change along with the input power of the radio frequency signal at each discrete frequency point. And constructing a linear transfer function and a nonlinear transfer function of the radio frequency device according to the curves. Judging a working area of the radio frequency device according to the input signal power of the radio frequency device, and calling different transfer functions or fixed parameters to obtain an intermediate signal; generating complex noise, and processing the complex noise in the same processing mode as the input signal of the radio frequency device; and finally obtaining an output signal. According to the invention, coupling correlation of the noise coefficient and gain compression of the radio frequency device is realized.

This invention discloses an electromagnetic environment disturbance immunity control method for an airborne distributed electronic countermeasures system, belonging to the field of airborne information system control technology. The method includes: distributed electronic countermeasures node synchronization, environmental anomaly disturbance determination, node observation anomaly correction, disturbance immunity control parameter generation, and environmental disturbance immunity control. It involves reversibly correcting observation data affected by gain compression or limiting to generate effective node observation data; further, it generates collaborative disturbance immunity control parameters based on the effective observation data and node operating constraints, and achieves closed-loop management of disturbance immunity control through control execution state retrieval and consistency verification. This invention can effectively distinguish between external suppression disturbances, local mutual interference, and node anomaly disturbances, improving the authenticity of observation data and the targeting of disturbance immunity control, and realizing stable operation and collaborative disturbance immunity capabilities of the airborne distributed electronic countermeasures system in complex electromagnetic environments.