Solid-state semiconductor circuitry has been utilized for the generation of high-power RF energy. Although these generators are significantly less expensive to manufacture, they are usually less efficient at producing higher power levels. The circuitry for these generators is the solidstate analogue for the crystal-controlled oscillator described previously.
Some solid-state systems can be operated at either 27.1 or 40.6 MHz at the operators discretion, with an impedance-matching tuning network functional for either frequency. These types of generators still require a highpower output amplifier tube to produce the energy required to sustain a plasma.
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