Patent ID: 8491759

Claim:
A matching network for physical vapor deposition, comprising: a first RF generator coupled to a deposition chamber target through a first impedance matching network having a first tuning circuit comprising a Voltage/Current probe, wherein the first RF generator is configured to introduce a first AC signal to the deposition chamber target; and a second RF generator coupled to a deposition chamber pedestal through a second impedance matching network and configured to introduce a second AC signal to the deposition chamber pedestal, wherein the first tuning circuit is configured to modify an effect of the second AC signal on plasma formed between the deposition chamber target and the deposition chamber pedestal, and wherein the Voltage/Current probe comprises: a voltage sensor configured to sense a voltage of an AC signal through an RF rod disposed at the output of the first impedance matching network; a Root Mean Square to DC voltage converter coupled to the voltage sensor via a low pass filter, an attenuator, and an overshoot clamp, wherein the Root Mean Square to DC voltage converter is configured to convert a filtered, attenuated, and clamped AC voltage to a DC voltage; and a buffer voltage amplifier coupled to the voltage converter via a DC scaling circuit and an offset adjustment circuit, wherein the buffer voltage amplifier is configured to output a voltage magnitude signal.