Abstract: A portable harmonics measurement instrument performs in-situ self-calibration of its current transducers and their associated measurement channels and of its voltage probes and their associated measurement channels. In-situ self-calibration is performed immediately before making a measurement on the alternating current power distribution grid. In-situ self-calibration is performed by means of a built-in voltage reference source and a built-in current reference source, which generate highly-accurate voltage and current calibration waveforms with harmonic components.

Abstract: A portable harmonics measurement instrument performs in-situ self-calibration of its current transducers and their associated measurement channels and of its voltage probes and their associated measurement channels. In-situ self-calibration is performed immediately before making a measurement on the alternating current power distribution grid. In-situ self-calibration is performed by means of a built-in voltage reference source and a built-in current reference source, which generate highly-accurate voltage and current calibration waveforms with harmonic components.

Abstract: A low power differential signaling technique for reducing power in CMOS circuits. An input signal is provided to the input of a transmitter which uses transitions of the input signal to switch between two complementary resistive paths between upper and lower voltages across a common resistive element to develop a differential signal pair. In particular, during a high transition, a first pair of resistive switches are coupled across the common resistor causing current flow in a first direction and, during a low transition of the input signal, a second pair of resistive switches are coupled across the same common resistive element to cause current to flow in the opposite direction. The switching action converts a single-ended input signal to a differential signal pair across the common resistive element. The voltage swing across the differential signal pair is reduced to less than one half of the voltage differential between the upper and lower voltages which represent the source voltages.