Power Amplifier
The Power Amplifier Manufacturer!
Dexing Magnet is a large enterprise with excellent quality and perfect service in the international magnetometer and machinery industry.
Why choose us
Professional Team
It has a group of experienced technicians and managers in the magnetometer and magnetic industries.
Our Product
Vibrating Sample Magnetometer, Hall Effect System, Gauss Meter, Flux Meter, Electromagnets, Helmholtz Coils, Magnetizers, Magnetic Material Property Testing Systems
Production Market
At present, the Dexinmag company has established cooperative relations with many schools and institutions at home and abroad for more than 30 years, such as Singapore Polytechnic University, Caltech, University of Hong Kong, etc.
Customized service
Equipment quality Reliable, electrical components and hydraulic transmission components are imported from Japan's Mitsubishi and Italy, and can provide qualified products and good after-sales service.
Characteristics of Power Amplifiers
Gain: It is the most important feature of a power amplifier. Power amplifiers are used where high gain is needed. This ensures that small signals are boosted to large levels. The gain of the amplifier is measured as a ratio of output voltage (or current) to the input voltage (or current). It is usually measured in decibels (dB). The higher this value the better.
Bandwidth: It is the range of input signal frequencies which can be amplified by the power amplifier. For a signal within the bandwidth of the power amplifier, the power amplifier magnifies it. For other signals, the signal is not amplified or is attenuated. Bandwidth is measured in Hertz (usually in kHz or MHz).
Efficiency: It is the ratio of output power to the total power consumed. It is an important feature of power amplifiers as designers want maximum power to be available at the output of the device. The remaining power is wasted as heat, humming noise etc. Efficiency is measured in percentage; the higher this value, the better.
Linearity: In simple terms, it is the ability of the power amplifier to preserve the signal properties at various time points. Specifically, it is the ability of the amplifier to maintain the same input signal to output signal ratio at all time points. For eg. if the input is 1mV DC and the gain of the amplifier is 1000, then for a linear power amplifier, at all time points, the output should be 1V.
Stability: Power amplifiers, if not well designed, can produce oscillations at the output. This can make it unstable. For the specified range of input signal, the output of a power amplifier should be non oscillatory. This is especially important when the power amplifiers incorporate feedback mechanisms. One technique to stabilise power amplifiers is to use negative feedback. Here a sample of the output is subtracted from the input signal (instead of adding it to the input signal).
Slew rate: It represents the rate of change of the output voltage over time. It indicates how quickly the output charges up. Since a power amplifier drives another circuit, it needs to first charge its input parasitic capacitance before the effect of the output of the power amplifier is visible in the next stage. Slew rate shows how quickly this output parasitic capacitance gets charged up. It is measured in V/ sec. The higher this value, the better it is for the power amplifiers.
Classes A-C
A Class A amplifier has a 360o conduction angle (100% of the input signal is used). It is the most linear, meaning the output signal is the best representation of the input.
Class D
Class D amplifiers use pulse-width modulation (PWM) to produce rail-to-rail digital output signal with a variable duty cycle to approximate the analog input signal. They are highly efficient because the output transistors are always either fully turned on or fully turned off.
Classes G and H
Class G amplifiers are similar to Class AB amps, except that they use two or more supply voltages and are more efficient because they use the maximum supply voltage only when required. Class H power amps are similar to Class G, but the Class H topology does not require multiple power supplies.
Selection WorkflowCompetitive advantage
Load Characterization
Identify capacitive/inductive/resistive properties.
01
Frequency Analysis
Determine static/low-frequency (<10kHz) or high-frequency (>50kHz) requirements.
02
Power Calculation
Apply P=V2/RP=V2/R or P=I2RP=I2R for load matching.
03
Distortion Tolerance
Opt for <0.5% THD in metrology-grade applications.
04
Power Compatibility
Verify 220V/380V infrastructure availability.
05
Stages of Power Amplifiers
Stage 1: Voltage amplification stage: As the input signal developed by the transducer is of very low value and a higher value signal is needed at the output so input signal is amplified at the very first stage of power amplifiers.
Stage 2: Driver stage: The amplified voltage obtained from the voltage amplifier is fed to the driver stage to provide maximum power gain and to facilitate impedance matching.
Stage 3: Output stage: This stage essentially consists of power amplifiers and is responsible to transfer maximum power to the output device.
Working principle of high voltage amplifier
Deliver, Shipping And Serving
Delivery Time
We promise to complete production and shipment within 7 working days after receiving the order.
Transportation
Professional packaging and safe transportation methods are used to ensure the safety of the equipment during transportation.
After-sales service
We provide comprehensive after-sales service, including equipment installation guidance, operation training, maintenance and so on. Meanwhile, we have a 24-hour customer service hotline to answer your questions at any time.
FAQ
As one of the leading power amplifier manufacturers and suppliers in China, we warmly welcome you to buy customized power amplifier from our factory. All equipment are with high quality and competitive price.
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