Abstract: A DAC deglitch circuit comprising a switch circuit for grounding the DAC output during the DAC's transitional period. The DAC is preferably a current type, although a voltage type is also contemplated. The switch circuit preferably includes a biased transistor circuit receiving the update or hold signal for grounding the output of the DAC during the hold period. The deglitch circuit generally causes a consistent glitch at every transition, which is easily filtered out by a filter circuit. The deglitch circuit is very simple inexpensive and consumes very little space and power.

Abstract: A system and method for enabling applications written for NI-VXI driver level software to operate with a session-based VISA system. The present invention receives driver level function calls from applications developed for the NI-VXI driver level library, opens sessions to the appropriate VISA resources and performs the necessary operations on these resources. This enables a VISA system to operate in conjunction with applications written for the NI-VXI driver level library. When a call to the NI-VXI function InitVXIlibrary is received, the method allocates one or more arrays which are used later for storing session identifiers to sessions created to corresponding VISA resources. When the system later receives a call to a function in the NI-VXI driver level library, the method first determines which VISA resources correspond to this function. The method either opens sessions to these resources or retrieves the session parameters from the respective arrays if sessions have already been created.