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DIGITAL_LEVELS_SCOPE_DISPLAYS_2_LOGIC_SIGNALS_ON_1_SCOPE

2016-12-01 08:02  
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DIGITAL_LEVELS_SCOPE_DISPLAYS_2_LOGIC_SIGNALS_ON_1_SCOPE
Using this simple resistor circuit, you can trick your oscilloscope into displaying two logic signals on one channel. If you select R2 to be twice R1, the scope trace will show one of four distinct analog levels for each possible combination of the states of inputs A and B. Of course, the voltage levels that your oscilloscope sees depends heavily on the current-sourcing capability of your digital logic. Because you must use high resistances, this technique has a limited frequency range.