SU784009A1 - Frequency divider with fractional division coefficient - Google Patents

Description

(54) THE DIVIDER OF FREQUENCY WITH A CROSSBAND Fission Factor

The invention relates to a pulse technique and can be used in measuring equipment as a divider of a sequence of pulses with a fractional division factor.

A known frequency divider with a fractional division factor, containing devices for blocking a single pulse, counting devices and a device for blocking N pulses (where N are integers from 1 to o) fl2.

In such a divider, due to the complex organization of blocking one and N pulses, the scaling devices have large conversion factors for better accuracy.

The purpose of the invention is to improve the accuracy of division.

To this end, in the frequency divider, a fractional division factor containing scaling devices and a pulse blocking device, between the scaling block outputs and one of the inputs of the pulse blocking device, coincident pulses are switched on, and between the combined scaling inputs and the other

the input of the pulse blocking device includes a delay element.

The drawing shows a structural electrical frequency divider circuit with a fractional division factor. The device comprises a delay element 1, a device 2 for blocking pulses, a device 3 for separating coincident pulses and

10 scaling devices 4, 5, 6, ... N. The inputs of the counting devices 4, 5, 6, ..., N and the input of the delay element 1 are connected to the common input, the outputs of the counting devices 4,5,6 ,, .., N are connected to the inputs of the device 3 for separating coincident pulses, the output which is connected to one input of pulse blocking device 2, the second input of which is sub20 keys to the output of delay element 1, and the output of device 2 is the output of a frequency divider.

The frequency divider works as follows.

25 The input pulses are fed to the input of the delay element 1 and to the inputs of the N counting devices, which are controlled frequency dividers with a division factor Cd. where

Claims (1)

30 IN - divider number in order. At the output of each IE, the enumerated G devices are the pulse frequency V-4JK. m-, Each of the sequences of pulses from the outputs of the scaling devices through the impulse separator 3 blocks the input pulses that pass to the impulse blocking device 2 through the 1 pulses delay element which is not necessary for the DIM to arrive at the same time. blocking device 2 input and blocking pulses. Wherein. at the output of the divider there will be a frequency of 1. ± l F -.sm - 1 --- 14w BH. v. li. I I / 1 Lg AB, Ah The coefficients of the KSMJiiioro jiS scaling devices are chosen in such a way that the number of blocks at the output of each of them maximally approximates the Shkhrdnuyu time to this orbital formula (2) . Then the coefficient of each recipe is determined as follows: (QUALITY < / RTI > and ynHYYY & Г Т Т Т Т т т гу п п) n D1 g ъ зад where Kd is the predetermined ratio of the divide. The curly braces mean that part of the number is intact. The unit is added when it forms a fractional remainder. In the proposed flejfflfeftf, the frequency of the VIII is the inverse of the definition of (3) inversely proportional to the square of the recalculators. Suppose, for example, that it is necessary to obtain the division factor Kd, 6.3b4, up to the last digit. Determining cd, we get 2, cdc 3, cdx 105, At the same time every 2nd, 3rd and 105th pulses will be blocked. Since the numbers 105 and 3 are multiples, it is possible that these 09 coincide (the pulses in time and as a result of the 1105 pulse will not be blocked. The passage through the device 3 for separating the coincident pulses in time. The problem is eliminated. 1 of obtaining the specified division ratio, 3b4 In the proposed frequency divider with a fractional division factor in scaling devices, it is necessary to use 5 decade counters. To obtain the same division factor in the known frequency divider, the division factor of the scaling devices must dig, cd, 3b4, cd, 2, i.e. 7 decadal counters must be used. With an increase in counting accuracy, the difference in the number of decade counters used increases even more. Thus, efficiency also increases in reliability due to a decrease in the element base. performance and cost reduction of equipment. Formula of the invention A frequency divider with a fractional division factor containing a recalculation. . “-..., uMct-iiewMH recalculate tiue tf gtchgLLLL“ - “- ---- i devices and a device for blocking pulses, characterized by the fact that, in order to improve the accuracy of the division (1I g, between the output of counting devices and one the impulse blocking device inputs include a device for coinciding pulses that coincide in time, and a delay element between the combined inputs of the counting devices and the other input of the pulse locking device is included. Sources of information taken into account in examination 1, USSR Author's Certificate 534038, Cl, H 03 By 23/24, 1975, entrance I Bbtmof