Unusual Frequency Dividers - techlib.com

1/2, k0 - 80 pF2 k2 k5 k0 - 5 V, 24 MHz6 MHz+ 5 VDCThe following circuit uses a 75140 line receiver to form an injection locked circuit is similar to the common op-amp square-wave oscillator with values selectedto keep the voltages within the recommended operating ranges. The Frequency to bedivided is coupled through a 5k resistor to the positive feedback input of the comparatorsuperimposing a volt squarewave. The small squarewave toggles the comparatorwhen the sawtooth voltage on the capacitor comes close to the DC level on the positivefeedback input. The result is that the comparator output Frequency is an integer sub-multiple of the input Frequency . Since the comparators exhibit good temperature stabilityand precision, the division ratio can be quite high. A division factor over 20 is practicaland since the 75140 is a dual line receiver, two Dividers may be cascaded for divisionratios over 400.

3, 1N5711 C NC HC or AC inverters or gates A pulse counter may be implemented by dumping the charge from a small capacitor into a larger capacitor at the input frequency.

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