SU750715A2 - Device for pulsed conversion of frequency - Google Patents

Description

(54) DEVICE FOR PULSE FREQUENCY TRANSFORMATION

one

 The invention relates to the field of electronic electronics and electrical engineering, where it is necessary to receive signals of several frequencies found in complex fractional ratios with the original frequency, and can be applied to generator transmitting equipment.

A device for pulse frequency conversion is known, containing a clock frequency generator, at least two splitters, a pulse number converter, and an output frequency selector, with |. the output of the clock generator is connected to the signal input of the pulse number converter and through the first frequency divider to the control input of the number converter of 20 pulses, the output of which is connected to the input of the output frequency selector 13.

The disadvantage of this device for pulse frequency conversion is the nonoptimality of the pulse sequence form in about 50% of cases of possible combinations of the initial and received frequencies, which worsens

In these cases, the spectral frequency / output signal and increases the requirements for selective & filter circuits installed at the output of the device, as well as redundancy for a number of frequency combinations, the number of necessary counting cells, which reduces the reliability of the device in these cases.

The aim of the invention is to increase the noise immunity, reliability, H simplification of the device.

This goal is achieved in that a pulse frequency converter device comprising a clock frequency generator, at least two frequency dividers, a pulse number converter and an output frequency selector, the output 1 of which: a clock frequency generator is connected to the pulse number converter signal input and through the first frequency divider - to the control input of the pulse number converter, (the output of which is connected to the input of the output frequency selector, the control unit of the first divider is inserted, and one of the inputs of this „block is connected to the output /

home clock generator, and the second - with the output of the first divider, while the output of the control unit is connected to the clock input of the first divider, in turn, the control unit of the first divider can be performed using two triggers and an additional frequency divider, and the 3-input of the first trigger connected to the output of the clock generator, the output of the first trigger is connected to the synchronous input of the first divider and through an additional divider to the K-inputs of the second trigger, the output of which is connected to the K-input of the first t rigger, the second K-input of which is connected to the output of the first divider and the D-input of the second trigger. Another variant of the control circuit of the first divider is proposed, in which the output of the first trigger can be connected directly to the K input of the first trigger and to the synchronous input of the first duration, and the output of the latter is connected to the 3 input of the second trigger through an additional divider.

FIG. 1 shows a block diagram of the proposed device, where

1-clock generator;

2-first frequency divider

3 pulse number converter;

4-second frequency divider;

5-output frequency selector; G-control unit first divider.

FIG. 2 and 3 are block diagrams of the proposed device, in which an additional divider is connected to the K-and 3-inputs of the second trigger of the control unit, respectively, where:

7th first block control trigger

8 second trigger control block

9-additional divider control unit.

The device works as follows. The first frequency divider 2, together with the first trigger of the control unit 7, isolates the division of the initial pulse sequence, the total division ratio will change during the repetition period, taking two discrete values. If the ratio of the original and transformed frequencies T5 / (}, then on period j the equal P / 2. Pulses of the initial frequency, the composite divider in the circuit shown in Fig. 2, once divides the number of pulses by K and Cdog, times by K + 1, where To the division factor of the first divider 2 Cdop. - the division factor of the additional divider 9. In the circuit shown in Fig. 3, the composite divider in the same period once divides the number of pulses by K + 1 and

- 1 time per K. To convert

A.OP.

The number of pulses 3 is made from the number of pulses of the source sequence in accordance with the output of the first frequency divider 2 arriving at its control input, as a result of which the required division factor of the second divider 4 is the type number determined by rounding the integer part of the ratio P / Q. to the side

decreasing to the nearest number 2

The proposed device has the following advantages in comparison with the prototype. In the proposed device, in all cases (at any frequency ratios) a sequence of optimal shape is formed at the output providing a high signal-to-noise ratio, whereas in the prototype the optimal shape is obtained only in half of the cases possible combinations of the nominal values of the original and received frequencies, and in other cases - the signal-to-interference ratio of the prototype is worse than the proposed device (especially in terms of the closest ones, the most dangerous side components).

In the proposed device, in all practical cases for the synthesis of given frequencies, the required number of triggers is minimally necessary, then; As with the known device, in most cases the circuit is implemented with the number of triggers greater than the minimum required number. As a result, the use of the proposed device allows reducing power consumption from power sources and increasing reliability.

Claims (2)

1. Device for pulse frequency conversion according to the author. St. No. 579693, characterized in that, in order to increase noise immunity and reliability, as well as to simplify the device, a first divider control unit is inserted, the outputs of the clock frequency generator and the first frequency divider are connected to the inputs of the first divider control unit, and its output is connected with the synchronous input of the first frequency divider. 2. The device according to claim 1, characterized in that the control unit of the first divider is two triggers and an additional divider, with the 3 input of the first trigger connected to the output of the clock generator, the output of the trigger connected to the synchronous input of the first frequency divider and, through an additional divider, with the K-input of the second trigger, the O-input of which is connected to the output of the first frequency divider and the K-input of the first trigger, the second K-input of which is connected to the output of the second trigger. Sources of information that are taken into consideration. 1. USSR author's certificate No. 579693, cl. H 03 K 5/156, 1977.