Patent ID: 7619419
Filing Date: 2009-11-17
Classification: G01R

Abstract:
1. A probe for communicating a differential signal of a device under test, said differential signal comprising at least one of a higher frequency component, including at least one of a higher frequency common mode signal and a higher frequency differential mode signal, and a lower frequency component, including at least one of a lower frequency common mode signal and a lower frequency differential mode signal, said probe comprising: (a) a choke attenuating said higher frequency common mode signal of said differential signal and having a choke output comprising at least one of said higher frequency differential mode signal and said lower frequency component of said differential signal; (b) a first filter blocking said higher frequency differential mode signal of said choke output and transmitting said lower frequency component of said choke output; (c) a differential amplifier attenuating said lower frequency common mode signal of said lower frequency component transmitted by said first filter and converting said lower frequency differential mode signal to a single ended, lower frequency signal; (d) a second filter blocking transmission of said lower frequency component of said common mode choke output and transmitting a higher frequency single ended signal corresponding to said higher frequency differential mode signal; and (e) a combiner summing said single ended, lower frequency signal and said single ended, higher frequency signal.