Patent ID: 6133949
Filing Date: 2000-10-17
Classification: G01R

Abstract:
A measuring circuit for determining a frequency bandwidth of a signal-processing circuit, arranged on an integrated circuit, for processing at least a picture signal, characterized in that the measuring circuit comprises:means for applying measuring pulses to the signal-processing circuit during a measuring process;means for measuring a time shift of said measuring pulses through the signal-processing circuit during said measuring process;a measuring capacitance;means for changing a charge on said measuring capacitance dependent on said measured time shift experienced by the measuring pulses in the signal-processing circuit;means for generating a measuring signal based on the charge on said capacitance, said measuring signal being indicative of the frequency bandwidth of the signal-processing circuit; andan electronic switch for switching the measuring capacitance before each measuring process to a reference potential for a short time, wherein the measuring circuit is also arranged on said integrated circuit along with the signal-processing circuit, and the measuring circuit is activated only during the measuring process.