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Evaluating oscilloscopes to debug mixed-signal designs

Posted: 07 Apr 2011     Print Version  Bookmark and Share

Keywords:mixed signal  oscilloscopes 

This paper begins by defining mixed signal oscilloscopes (MSOs), including an overview of the primary applications where MSOs should be used. This paper discusses the number of channels, bandwidth, and sample rates required to effectively monitor various analogue and digital I/O signals in typical MCU/DSP-based designs, as well as covers the various types of mixed-signal triggering you should look for in an MSO in order to effectively test and debug embedded designs. Using an example of a mixed-signal embedded design based on a 16bitwide instruction-set microcontroller (Microchip PIC18), this paper also provides a typical turn-on and debugging methodology using an MSO to verify proper signal quality of a pulsed analogue "chirp" output signal generated by the MCU and its associated peripheral hardware based on a variety of analogue, digital, and serial I/O (I2C) input conditions.

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