PWM Benchmark Voltage Generating Circuit

Published:2011/7/22 21:41:00 Author:Michel | Keyword: Benchmark Voltage, Generating Circuit | From:SeekIC

The picture is PWM benchmark voltage generating circuit.In the ciruit,74HC161(1) and 74HC161(2) are four binary counters.Once the clock signal CLK inputs 256 pulses and it outputs、 instructions and trigger 74H04 are set in advance.74 HC191 (1) and 74 HC191 (2) are the subtraction counters.74 HC161 (1) carry instruction makes voltage data load and decreasingly count.4 HC191(1) carry instruction makes the trigger 74HC74 reset and setting and resetting time become relative to their data. Step voltage is lOmV, R2 short-circuits.



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