Load connection detection
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United States of America Patent
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Sep 26, 2017
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app pub date -
Nov 25, 2014
filing date -
Nov 25, 2014
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Abstract
An apparatus comprises an output port to be connected to a load; a first input port to receive a first input signal; and a second input port coupled between the first input port and the output port, to receive a second input signal. The apparatus further comprises a coupling circuit to couple the second input signal to the output port and a frequency isolation circuit that has a frequency response to propagate the first input signal to the output port but prevent the second input signal from propagating to the first input port. The apparatus also comprises a detection circuit to determine a voltage of an output signal at the output port, the output signal having a first amplitude range with a load absent at the output port and having a second amplitude range lower than the first amplitude range with the load present at the output port.
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