Patent ID: 7495591

Claim:
A method for testing a device under test—DUT—comprising: providing a test signal from the DUT to a test probe, taking analog samples from the test signal being present at the test probe at a first sampling rate, taking digital samples from the test signal being present at the test probe at a second sampling rate, providing a control signal indicative of sampling times of the analog samples, the control signal being sent by a control circuit, performing an analysis of the digital samples in conjunction with the control signal, and wherein taking the analog samples is done by an analog sampling circuitry, the analog sampling circuitry comprising a series connection of two diodes, wherein each diode is connected to a controllable current source, the control circuit is controlling the switching of the controllable current sources of the analog sampling circuitry in order to capture the analog samples of the test signal from the DUT, and wherein a capacitance is provided for storing the analog samples.