Using a Function Generator for Logic Pulses and Triggers
Instructions below will help to configure SDG Series function generators to produce pulses/signals with positive-only voltages for circuits and systems in which positive voltages are required, e.g., CMOS and TTL.
Jim Wilson
Last Update 9 months ago
Models: SDG1000X, SDG1000X Plus, SDG2000X, SDG6000X
SDG series Function and Arbitrary Waveform generators produce bipolar waveforms that are symmetric about a 0V offset, by default.
The offset can be raised or lowered to move the waveform entirely above or below 0V. A waveform may be inverted by changing the Polarity setting.
POSITIVE-GOING PULSE
- To produce positive-going logic pulses referenced to 0V, choose Pulse waveform, set the Amplitude (e.g., +5V) and adjust the Offset to ½ the amplitude (+2.5V).
- Another way to do this is to set the values as HighLevel and LowLevel, where HighLevel is the logic high level (+5V) and LowLevel is the low logic level (e.g., 0V).
NEGATIVE-GOING PULSE
- To produce negative-going logic pulses referenced to the high logic level, choose Pulse waveform, set the Amplitude as a positive value (e.g., +5V) and set the Offset to negative ½ Amplitude (e.g., -2.5V)
- Then change the Polarity to Invert (under the Utility/Output Setup menu).
- Another way to do this is to first change Polarity to Invert and then set HighLevel and LowLevel, where HighLevel is the logic low level (e.g., 0V) and LowLevel is the inverse of the high logic level (e.g., -5V).
