Patent ID: 7550962

Claim:
A wideband input attenuation circuit for an active voltage measurement probe receiving an input signal from a device under test comprising: a compensated RC attenuator having a first resistive element coupled in parallel with a first capacitive element that are coupled in series with a second resistive element coupled in parallel with a second capacitive element; a Z 0 attenuator having a first resistive element coupled in series with a second resistive element, the first resistive element of the Z 0 attenuator being coupled to the first resistive element coupled in parallel with the first capacitive element of the compensated RC attenuator and the second resistive element of the Z 0 attenuator being coupled to the second resistive element coupled in parallel with the second capacitive element of the compensated RC attenuator; a transmission line coupling the first resistive element coupled in parallel with the first capacitive element of the compensated RC attenuator to the second resistive element of the Z 0 attenuator; and a buffer amplifier coupled to the junction of the transmission line with the second resistive element of the Z 0 attenuator.