Patent ID: 6963214
Filing Date: 2005-11-08
Classification: G01R

Abstract:
1. A method of reducing noise and power supply instability problems during OBIRCH analysis testing of circuit elements requiring a precise operating or core voltage comprising the steps of: providing an OBIRCH analysis circuit having I/O terminals; connecting a circuit element to be tested to said OBIRCH analysis circuitry; connecting a power source having a positive and a negative output across said I/O terminals for providing a known voltage to said OBIRCH analysis circuit; connecting a diode circuit across said positive and negative outputs of said power source, said diode circuit comprising the steps of connecting the anode of a common or bi-polar diode to said positive output and connecting the cathode of said bi-polar diode to the anode of the first one of a plurality of Schottky diodes serially connected, cathode-to-anode, and coupling said negative output of said power source to the cathode end of said plurality of serially connected Schottky diodes, such that a precise and different voltage selection is available at the anode of each Schottky diode of said series; connecting one of said precise voltage selections to said circuit element to be tested as its core or operating voltage; and running an OBIRCH circuit analysis on said circuit element to be tested.