Solid-state radio frequency generator

Abstract

The invention discloses a power amplifier and an output circuit thereof. The invention comprises the power amplifier, a directional coupler and an impedance matching box, wherein the power output stage of the power amplifier consists of two semiconductor field effect transistors, and performs power amplification on a received pre-high-frequency power signal; the directional coupler acquires an incident power signal of the power amplifier and a reflection power signal in impedance mismatching, performs automatic power control by using the incident power signal and performs circuit protection by using the reflection power signal; and the impedance matching box receives high-frequency power from the power amplifier, outputs stable high-frequency power and adds the stably output high-frequency power to a quartz torque tube load after impedance matching to realize a radio frequency generator manufactured by adopting solid devices in an inductively coupled plasma emission spectrometer. The solid-state radio frequency generator has a simple circuit, is stable, reliable and convenient to debug, and adopts fewer devices.

Description

technical field [0001] The present invention relates to a technique for realizing an excitation light source, in particular to a solid-state radio frequency generator for realizing an inductively coupled plasma atomic emission spectrometer (abbreviated as ICP-AES) in an analytical test instrument. Background technique [0002] At present, the scope of application of analytical testing instruments is gradually expanding, especially ICP-AES has been widely used in various fields of the national economy. Improving the performance and stability of analytical testing instruments has become a common demand of designers, producers and users. In particular, higher requirements are put forward for the excitation light source in ICP-AES, that is, the output power, life, stability, and volume of the RF generator. The stability of the RF generator directly affects the accuracy of the analysis and test results. It can be said that the stability of the RF generator is one of the very imp...

AI Technical Summary

Problems solved by technology

The working principle of the electron tube is that electrons are emitted from the cathode and fly to the anode through the grid. The emission capability of the electron flow is limited by the cathode material, grid material and process, and the stability is poor.

Therefore, it is difficult for the current electronic tube RF generator to produce products with high output power stability

In addition, the radio frequency generator of the electronic tube circuit is bulky and heavy, and the life of the electronic tube itself is only about 1,000 hours

These unfavorable factors greatly limit the improvement of the performance of the RF generator, and even affect the overall performance of the analytical test instrument

With the continuous development of ICP-AES, the stability requirements of RF generators are getting higher and higher, and it is difficult for tube-type RF generators to meet the above requirements.

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