Patent ID: 6374379
Filing Date: 2002-04-16
Classification: G01R

Abstract:
A semiconductor chip adapted for use in an automatic test system, comprising:a modulation circuit, the modulation circuit having a control input and an output connected to an output pad of the semiconductor chip, the modulation circuit producing a stream of digital bits at its output for subsequent conversion into a first DC level, the stream of digital bits being representative of a value at the control input of the modulation circuit; and a programmable digital signal processing device for monitoring and controlling the first DC level, the digital signal processing device including an A-to-D channel connected to an input pad of the semiconductor chip, the A-to-D channel being used to convert a second DC level applied to the input pad into digital data, the second DC level being proportional to the first DC level, wherein the digital signal processing device is programmed for determining deviations of the digital data from desired data stored in memory and for controlling the value at the control input of the modulation circuit to minimize the deviations.