Browse Prior Art Database

Frequency Divider

IP.com Disclosure Number: IPCOM000096668D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Tomczak, JJ: AUTHOR

Abstract

This circuit is a two-to-one frequency divider. It employs diode gates for binary triggering of a bistable flip-flop and controlling the output of a blocking oscillator.

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Frequency Divider

This circuit is a two-to-one frequency divider. It employs diode gates for binary triggering of a bistable flip-flop and controlling the output of a blocking oscillator.

If, in the flip-flop circuit, transistor T2 is initially nonconductive and transistor T1 is conductive, the high collector voltage of T2 at terminal 3 biases diodes D3 and D5 for nonconduction. The relatively low collector voltage of T1, which is made less than its emitter to base potential, biases diodes D2 and D4 through resistor R2 for conduction. When input pulse 10 is applied to the circuit via terminal 1, it performs two functions. It first passes through diode D6 and causes blocking oscillator 11 to produce an output pulse 9 at terminal 2. The second is to cause the state of the flip-flop to change. This is accomplished by pulse 10 passing through capacitor C3 and diode D4 to the base of T2. T2 is thus rendered conductive and flip-flop action occurs with T1 becoming nonconductive and T2 conductive. The potential at terminal 3 is thus caused to fall and to forwardly bias diode D5. To prevent input pulse 10 from overcoming the back bias on diode D1, forwardly biased diode D2 shorts input pulse 10 through collector of T1 to ground. Diode D3 performs the same function when T2 is conductive.

When input pulse 12 is applied to terminal 1, it is shorted through forwardly biased diode D5 and transistor T2 to ground and does not effect blocking oscillator 11. The result is that no...