An active electrical test probe with wideband frequency capability for use on a test probe card, along with other test probes. A small hybrid integrated circuit is mounted on a substrate held on edge, adjacent the probe tip contact element of the probe, by a conductive metal clip. The circuit is provided...http://www.google.com/patents/US4783625?utm_source=gb-gplus-sharePatent US4783625 - Wideband high impedance card mountable probe
