Abstract
An improved analogue front-end for measuring the high state of trapezoidal voltage pulses with transition duration of 3 μs is presented. A new measurement system, composed by a front-end and the state-of-the-art acquisition board NI PXI-5922, has been realized with improved Common Mode Rejection Ratio (CMRR) of more than 87 dB at DC and 3-sigma stability of ±0.65 ppm over 1 day. After highlighting the main design enhancements with respect to state-of-the-art solutions, the CMRR measurement is reported. The output drift due to temperature and humidity is assessed to be negligible. Finally, the worst-case repeatability is measured both with shorted-to-ground inputs and with an applied common-mode voltage of 10 V, which represents the nominal working condition.
Highlights
Pulsed power supplies are widely used in applications where energy consumption is important,1 such as pulsed lasers, electromagnetic pulse generators, and particle accelerators.2 In this framework, a full characterization of the power pulses is needed, for instance, to determine the exact amount of energy delivered to the load.In this paper, an analogue front-end with improved Common Mode Rejection Ratio (CMRR) and thermal stability for characterizing the high states of trapezoidal voltage pulses with transition durations of 3 μs is presented
The acquisition system is composed of an improved analogue front-end (Fig. 1) and the state-of-the-art acquisition board N I PX I − 5922.15 For this measurement, the purpose of the front-end is to subtract the nominal DC value of the pulse’s high state from the pulse and amplify the result to adapt the full-scale of the acquisition board to the high state measurement
The main feature of the measurement system presented in Ref. 10 was a√very-low Power Spectral Density (PSD) of roughly 14 nV/ Hz resulting in an ultra-low noise measurement capability of 3.12 ppm RMS of full-scale even at the required high-bandwidth of 5 MHz
Summary
Pulsed power supplies are widely used in applications where energy consumption is important, such as pulsed lasers, electromagnetic pulse generators, and particle accelerators. In this framework, a full characterization of the power pulses is needed, for instance, to determine the exact amount of energy delivered to the load. Pulsed power supplies are widely used in applications where energy consumption is important, such as pulsed lasers, electromagnetic pulse generators, and particle accelerators.. Pulsed power supplies are widely used in applications where energy consumption is important, such as pulsed lasers, electromagnetic pulse generators, and particle accelerators.2 In this framework, a full characterization of the power pulses is needed, for instance, to determine the exact amount of energy delivered to the load. An analogue front-end with improved CMRR and thermal stability for characterizing the high states (nominally constant valued levels) of trapezoidal voltage pulses with transition durations of 3 μs is presented.
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