Long cycle sawtooth wave generator circuit composed of the CD4020A

Published:2011/8/26 3:13:00 Author:TaoXi | Keyword: Long cycle, sawtooth wave, generator | From:SeekIC

The long cycle sawtooth wave generator circuit composed of the CD4020A is as shown in the figure. The CD4O2OA is designed as the 14-level binary counter, the output port of it is connected with the R-2R trapezoidal network, it can output the analog voltage according to the clock pulse in the D/A conversion, at this time, it changes into the D/A converter. The R-2R trapezoidal network has the small resistance value, and the error is large, so we use the 200kΩ resistor. This circuit uses the 11-bit of the Q1~Q14 of CD4020A, the minimum resolution is 5/2048(V), the Q1~Q3 can be used as the frequency divider only. The oscillation period of this circuit is set to 1h, you can change the oscillation period by setting the oscillation frequency.



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