A 60-finger class-A SiGe linear power amplifer (PA) w ith 22dBm of 1dB compress point output power (P 1dB),11dB of power gain (G p) and 26.1% of power added efficiency (PAE) @900MHz,3.5V/0.2A is demonstrated.
The paper has developed one power amplifier being used for the water treatment drive ultrasonic transducer, it has realized the power amplification being frequency from 18kHz to 30kHz sine waves and the maximum amplitude about 1.5V, maximal adjustable output voltage amplitude is 210V , the maximum power output is 300W.
At first, the nonlinear characteristic of RF power amplification is discussed in this paper, Several typical mathematical model of RF power amplifier is presented in this paper, we analyzed the principle of baseband adaptive predistorter and some typical predistorter architectures;
The paper has analyzed the characteristic of ultrasonic transducer the relationship of electrics resistor and ultrasonic frequency and single stage LC filter and two stage LC filter, it has tracked the power amplification having chosen the two-stage LC wave filter to the switch combining with changer matching and frequency.
A new electron beam (EB) control system was developed in a general vacuum EB machine by equipping it with an industrial control computer, programmable logic control (PLC), deflection coil, data acquisition card, power amplifier, etc.
A Two-Channel Power Amplifier with a Diplexer Output
A Low-Consumption Ultrabroadband Power Amplifier with the Overload Protection
An ultrabroadband power amplifier with automatic control of the consumption current intended for operation into an unmatched load is described.
A power amplifier is described in which, in order to combine the powers of channel amplifiers, directional couplers are used that are based on helical transmission lines placed in a cylindrical shield.