modified 19 hours ago

Sawtooth from a R-2R DAC

00:11:28

An unusual way to generate a sawtooth signal.

1) The counter ramps up from 0000 to 1111 providing 16 digital levels.
2) The operational Amplifier is driven by a R-2R ladder thus, the inverting input varies from a minimum voltage to the maximum generated by the ladder.
3) The OPAMP gain is set by Rf/Ri.
4) At the output, the filter composed by the 3.3 Kohm resistor and 1 uF capacitor smooths the opamp Vout and the diode suddenly discharge the capacitor when the digital code is "0000".

Note: Rf is the reaction resistor (50K) and Ri is the one connected to invering pin.<br>

published 20 hours ago

jpoulin0901

16 hours ago

You can get an exta bit of resolution by taking your LSB from the clock input (Assuming it has a 50% duty cycle).

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