DVI-300/2000 Load Step Response

Posted on Feb 5, 2014

Channel 0 of the Dual Voltage/Current Source (DVI) was used as the input. Input levels of +3V and +5V were used. Load current was the variable of interest we wanted to relate to the performance of the DVI. One DVI with a maximum of 300 mA and another with a maximum of 2000 mA were tested. The NDP7060 n-channel FET was used to switch in the low res

DVI-300/2000 Load Step Response
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istor, and thus introduced high load current. When the gate voltage is sufficiently greater than the source voltage (minimum of 2 V as specified on the data sheet), the FET turns on and allows current to flow from the drain to the source. Intuitively, when the FET is off, no current is allowed to flow, and so the DVI only sees the high resistance, equivalent to having low current load. An external driver operated by a switch relay was used to turn the gate on and off. With load resistance and current changing, a voltage glitch of a given amplitude is expected. To minimize the effect of the glitch, the circuit is rewired to include a bypass capacitor attached in parallel with the load resistors. VisualATE and an ASL1000 were used to operate the DVI on slot 9. A simple C+ script was written to operate the channel and external driver to change the load resistance and current. Glitches were examined at instances were load current changed from low to high and high to low using an AC coupled probe on an oscilloscope. Tests were performed on both DVI boards with and without the bypass capacitor on two load current combinations. Voltage levels of +3V and +5V were used on the DVI-300 board to test input power effects. In the no capacitor tests, A and C along with E and G were given the same testing parameters of load current on different DVI boards, but the results turned out significantly different. The DVI-2000 board had glitches...

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