The frequency of this circuit can be controlled by a voltage applied to the Vin input. The output signal is rectangular, and the main frequency depends on R and C which can assume values in the indicated range. The control voltage can vary between 0 and the voltage used in the supply. NAND and NOR CMOS gates connected as inverters can be used on this circuit. The circuit is from Newton C. Braga's CMOS Sourcebook, published in the United States.
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