Patent ID: 8654805
Filing Date: 2014-02-18
Classification: H01S,H03F

Abstract:
1. Radio-frequency (RF) power supply apparatus for supply RF power to discharge electrodes of a gas-discharge laser, comprising: a first plurality of transistor amplifier modules each thereof having an RF output; a power combining arrangement for combining the transistor amplifier module RF outputs into a single combined RF output connected to the discharge electrodes; a DC power supply for supplying a DC voltage to each of the first plurality of transistor amplifier modules, the DC power supply being connectable to or disconnectable from each of the transistor amplifier modules, separately, via a corresponding first plurality of electrical switches; and a first current-sensor located in an electrical path between the DC power supply and the first plurality of electrical switches for monitoring current drawn by any one of the first plurality of transistor amplifier modules when that transistor amplifier module is connected to the DC power supply.