Capacitive coupling probe, signal acquisition method and test system

摘要

PURPOSE: To realize highly accurate noncontact capturing of the signal in a circuit up to a high frequency by constituting a capacitive coupling probe of a probe chip, a probe body coupled mechanically therewith, and an amplifier arranged therein. ;CONSTITUTION: The probe 102 comprises a probe body 108, and a probe chip 104 having inner and outer conductors (or shield) 306, 308 arranged coaxially. At the detection end 310 of the chip 104, the conductor 306 detects an electric signal from an objective trace or a circuit conductor (e.g. an I/O pin 304) through capacitive coupling. The detection signal is amplified by a buffer/ amplifier 106 in a body 108 disposed closely to the chip 104 and can be observed directly on an oscilloscope, a strain gauge or a spectrum analyzer or it can be fed to a reproduction circuit 110.;COPYRIGHT: (C)1993,JPO