SU518870A1 - Frequency divider - Google Patents

Description

(54) FREQUENCY DIVER

the zero input of the trigger 12, with a single input through which the element OR 13 and the driver of the short pulses 14 are associated 7 and the overflow output of the counter O.

A single trigger output 12 is connected to the input of a matching element 15, the second input of which is connected to the input bus 1. The buses 16 and 17 are the outputs of the device.

Before starting, the frequency divider is initially set up. To do this, a negative impulse must be sent to bus 7, with the clocking trigger 2 and R - & The pulse distributor triggers are set to the zero state. At the same time, this impulse will pass through the element OR 13 and the shaper 14, which will generate a short impulse of the necessary polarity and set trigger 12 to a single state. The coincidence element 15 will open at the input to which the unit output of the trigger 12 is wound.

The frequency divider works as follows.

For each pulse of the input frequency arriving at bus 1, the clock trigger 2 changes its state. Accordingly, at its outputs, potentials corresponding to levels 1 and O appear alternately. Each change in potentials at its outputs corresponds to new states of R-S triggers. These triggers are connected to the Mis by waiting for themselves in a ring so that when the first four counting pulses are received, the ring from the first trigger to the last trigger moves one of them, and when the next four counts arrive, the zero from the first trigger goes to the last trigger. After this, the cycle of operation of the pulse distributor itself is repeated.

Due to cross-prohibitory connections to the inputs of the input valves of each RS trigger with the outputs of the next in the trigger ring at the outputs Q of the input valves 3 and 4 once per counting cycle (at the moment of transferring the corresponding R - S trigger into a single zero state ), a negative potential appears, which is held until the next counting pulse arrives on bus 1.

The presence of a negative potential at the output U j of the corresponding valve corresponds to a well-defined state of the counters, i.e. is a signal for decoding a state of a counter.

If all the keys 8 are open (the keys can be either mechanical, for example toggle switches, or contactless, for example, coincidence elements), then when pulses arrive at bus 1 they will go through output element 15 to output bus 16 and thus the transmission coefficient is realized in the device unit, i.e. Of the eight pulses entering the device, eight pulses will also be sent to its output.

When applying the permitting signal to the control input 9 of the key 8, to which the output is connected, for example, Ug- pulse distributor, i.e. when closing (unlocking) the corresponding key 8, it will work in the usual way.

On the bus bar 16, the input pulses will pass through the coincidence element 15.

Upon receipt of the first five input pulses at the output I, - the distributor has a negative differential (potential), which through the open key 8 and through the element OR 10 enters the driver of short pulses 11, which will generate a short pulse of the desired polarity and set the trigger 12 to zero state. Trigger 12 will close match element 15, and the input feed

pulses to bus 16 stop.

Only the first five input pulses were received at output 16. When the pulse distributor counts eight pulses, the output of the overflow results in a negative differential that passes through the OR 13 element and the short pulse shaper 14. sets trigger 12 to one state. Trigger 12, in turn, will open the element

15 matches.

The frequency divider is ready for the next cycle.

Thus, out of every eight input pulses at the output of the device we will receive the first 8 five pulses. When any other switch is closed on the device's pin 16, we will receive the corresponding number of pulses from the eight input pulses received on bus 1.

On the bus 17 of the device, it is possible to receive signals from which the ratio between the durations T | and T2 within period T, i.e. change the duty cycle of the output signal.

In the proposed divider, a range of frequency division coefficients can be expanded. To do this, you must add a certain number of R - S triggers, a multiple of two, and the corresponding number of keys 8 and the inputs of the element OR 10.

Claims (1)

Invention Formula A frequency divider containing a pulse distributor, implemented on a register with paraphase inhibitory communications, characterized in that, in order to expand its functionality, controlled keys, two OR elements, a coincidence element, two short pulse pulses and a trigger, and all outputs, except for the output of the full pulse distributor, are controlled through control inputs to the inputs of the first OR element, the output of which is connected to the zero trigger input through the first short pulse generator, to a unit input through the serially connected element OR and the second short pulse driver are connected to the pulse distributor overflow output, and the first input of the coincidence element, the second input of which is the device input, is connected to the unit output.