Multiple output supplies must meet TWT demands

Several voltages must be supplied to a traveling-wave tube (TWT) to make it perform its amplification function. A TWT is usually integrated with a power converter (supply) which accepts a single voltage from a power bus and generates various voltages required by the TWT. It is of prime importance that the design of the TWT power supply receives as much attention as the design of the TWT. Unless properly designed, the power supply can introduce noise, lead to improper amplifier operation, or even cause tube damage. A TWT power supply assembly is discussed along with the conduction of power calculations, phase effects on cathode voltage, and the turn-on characteristics.