Frequency Extension Methods and Apparatus for Low-Frequency Electronic Instrumentation

A method of providing selective frequency extension to low-frequency electronic instrumentation, comprising:

• providing an electronic measuring instrument having a permissible input frequency range;
• coupling one or more downconverting frequency extending units (FEU-Ds) between a test signal output of a device under test (DUT) and a measuring input of said electronic measuring instrument, said one or more downconverting FEU-Ds including downconverting circuitry operable to downconvert a test signal from said DUT to a downconverted test signal having a frequency within the permissible input frequency range of said measuring instrument;
• and
• measuring the downconverted test signal using said electronic measuring instrument.

A method of providing selective frequency extension to low-frequency electronic instrumentation, comprising:

• providing an electronic measuring instrument and a signal generator;
• coupling one or more upconverting frequency extending units (FEU-Us) between a stimulus signal output of said signal generator and a stimulus signal input of a device under test (DUT), said one or more upconverting FEU-Us including upconverting circuitry operable to upconvert a stimulus signal from said signal generator to an upconverted stimulus signal;
• and
• measuring a test signal from said DUT in response to said DUT's response to said upconverted stimulus signal.