Apparatus and method for de-embedding a combiner from a balanced signal

A method of de-embedding a combiner from an acquired signal received from a device under test, comprising:

• receiving, via a first channel of a plurality of channels, a first side of a reference differential signal pair;
• receiving, via a second channel of the plurality of channels, a second side of the reference differential signal pair;
• producing a reference signal based on the first side of the reference differential signal pair and the second side of the reference differential signal pair;
• receiving a combined signal, from a combiner, that is a balanced signal produced from the first side of the reference differential signal pair and the second side of the reference differential signal pair;
• generating a de-embed filter based on the reference signal and the combined signal;
• receiving the acquired signal from the combiner;
• and
• removing an effect of the combiner from the acquired signal by applying the de-embed filter to the acquired signal.

One or more computer readable storage media having instructions stored thereon that, when executed by a processor of a test and measurement instrument, cause the test and measurement instrument to:

• receive, via a first channel of a plurality of channels, a positive side of a reference differential signal pair;
• receive, via a second channel of the plurality of channels, a negative side of the reference differential signal pair;
• produce a reference signal based on the positive side of the reference differential signal pair and the negative side of the reference differential signal pair;
• receive a combined signal, from a combiner, that is a balanced signal produced from the positive side of the reference differential signal pair and the negative side of the reference differential signal pair;
• generate a de-embed filter based on the reference signal and the combined signal;
• receive an additional balanced signal from the combiner when the combiner is connected to a device under test;
• and
• remove an effect of the combiner from the additional balanced signal by applying the de-embed filter to the additional balanced signal.