Active probe powered through driven coax cable
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United States of America Patent
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Feb 2, 2021
Grant Date -
May 9, 2019
app pub date -
Nov 5, 2018
filing date -
Nov 6, 2017
priority date (Note) -
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Abstract
A novel coupling system may include a head-end circuit for coupling a probe via a cable to an instrument, delivering power to the probe over the cable while the cable carries signal(s) from the probe to the instrument. The head-end circuit may include a first terminal for coupling to the probe via a cable, and may further include a second terminal for coupling to the instrument. The head-end circuit may apply direct-current (DC) power to the cable, and may remove a DC voltage offset resulting from the applied DC power before a signal from the probe reaches the instrument. The head-end circuit may include a common node coupled to the first terminal, a current source coupling the common node to a supply voltage, and a voltage source coupling the common node to a second terminal that couples to the instrument.
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