Patent ID: 7912667

Claim:
An electrical test circuit for testing integrated circuits, particularly dynamic A/D converters, the electrical test circuit comprising: a first input configured for receiving a test signal of an integrated circuit; a second input configured to receive a normalized reference signal, particularly one that is formed to be synchronous with the test signal; a control device configured such that a deviation or an amplitude or a phase of the reference signal or of the test signal is or, respectively, are changed; the control device configured to generate a difference signal by subtracting the reference signal from the test signal; an output for outputting the difference signal; and a measuring device configured to receive the difference signal; wherein the control device comprises a control loop circuit which is provided for adapting the deviation of the test signal, the control loop circuit being configured in such a manner that a deviation-corrected test signal is generated in that the difference values between the deviations of the test signal are added together to obtain an aggregate difference value and in that the test signal is corrected by addition with the aggregate difference value.