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专利名称：Method of probing a pulsed signal in a
circuit using a wide bandwidth passive probe
发明人：Zamborelli, Thomas J.申请号：EP92303033.2申请日：19920406公开号：EP0513992B1公开日：19990804
摘要：A passive test probe apparatus 100 is disclosed which provides high impedanceand a relatively flat frequency response over a wide bandwidth. The probe apparatus 100uses standard, non-lossy coaxial cable 130. The probe apparatus 100 employs a lowcapacitance probe tip 102 designed to minimize stray probe tip capacitance. The probeapparatus 100 uses a front-end (tip) resistor Rt in series with a conventional RC tipnetwork 240. The tip resistor Rt provides two functions: First, it establishes a minimuminput impedance for the probe input, and secondly, it provides approximately 80% of thehigh frequency attenuation when working into the cable characteristic impedance. Inaddition, a technique is described for determining an optimum length of coaxial cable 130to be used in the probe apparatus 100. When the cable length is selected in accordancewith the present invention, the crossover dip and other transmission line signal distortioneffects are minimized.
申请人：HEWLETT PACKARD CO
地址：US
国籍：US
代理机构：Colgan, Stephen James
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