SU886229A1 - Multichannel device for pulse synchronization - Google Patents

Description

The invention relates to a pulse technique and can be used, for example, in frequency converters — a code for synchronizing the pulses of the frequency being converted and reference frequencies. A synchronization device is known which contains N channels, each of which includes a trigger and two AND elements, a multiphase reference frequency generator and a threshold logic element I 1. The disadvantage of the device is insufficient accuracy. The closest in technical essence is a synchronization device, containing more than N shaping channels, each of which consists of a trigger, the output of which is connected to the first inputs of the first and second AND elements, the OR element, whose inputs are connected from the output of the second AND element of each channel formation, a multiphase generator of the reference frequency, the outputs of which are connected respectively to the second inputs of the first and second elements AND of each channel of the formation, and the input to the device ismHa is connected to the first input of the trig la the interviewer each kana forming, yield pervog6.le- ment of first channel odds trOvani connected to the trigger input vtorm of forming of the last channel as well. the outputs of the AND elements of the second and all subsequent channels of the 4-channel are connected to the second inputs of the previous channel of the previous channel 1 and 2. As the reference frequency generators in devices of this type, in most cases, quartz sinusoidal generators are used. To obtain the reference frequency pulses at the output of each of the phase of such a generator, it is necessary to put a fuser. The duration of the output pulses depends on a number of external and internal causes (the slit width of the input voltage:, the parameters of the elements, the supply voltage, etc.) and varies over time. Therefore, the manufacture of drivers with the same pulse duration in all phases with a high degree of accuracy greatly complicates the device and makes it difficult to set it up. In addition, the disadvantage of the device is the component of timing error due to the ambiguity of the generator phase selection .

The purpose of the invention is to reduce synchronization errors.

The delivered chain is achieved in order. that a multichannel pulse synchronization device containing N shaping channels, each of which consists of a trigger, the output of which is connected to the first inputs of the first and second elements AND, the first input of the trigger is connected to the bus of the synchronized signal, and the second input to the output of the first element AND the formation channel, as well as the OR element, whose inputs are connected to the outputs of the second elements AND of each channel of the formation, and the N-phase generator of the reference frequency f, is added to each of the formation channels a body trigger, with one input of the Additional trigger of the i-ro channel (i 1, ..., N connected to the output of the i-th phase of the generator, and the second input of the same trigger - to the output of the -j-th phase of the generator (j 1 ,. .., N), where the difference ji determines the duration -f of the output pulse of the device:

rHj-l) / Nf,

and the output of the additional trigger of the ith channel is connected to the second input of the first element AND 1 of the channel and the second input of the second element AND j + m-ro channel, where m 1 is for advanced synchronization and m 2 for late synchronization.

The drawing shows a block diagram of the device.

A multichannel device for pulse synchronization contains a multiphase generator 1 of the reference part f, additional triggers 2-5, for example, type d3-aK, main triggers 6-9, first 10-13 and second 14-17 elements AND, respectively, are combined into N forming channels two triggers and two elements AND in each, as well as element 18 OR ..

In the inputs 19-22 of the multiphase generator 1 of the reference part f are connected respectively to the first inputs 2326 "of the trigger 2-5, the first input of the i-channel trigger is connected to the output of the i-phase of the generator, and to the inputs 27-30 of the trigger 2-5, with the second input. Trigger 1st channel connected to the output of the j-th phase of the generator.

The outputs 31-34 of the flip-flops 2-5 are connected to the second inputs 35-38 of the first elements 10-13 Nor the second inputs 39-42 of the second elements 14-17 And, and the output of the trigger of the 1st channel is connected to the second input of the first

element I of the 1st channel and with the second t input of the second element of the AND (j + 1) -th channel in case of advanced synchronization and (j + 2) -th channel during late synchronization. It should be noted that hereinafter algebraic addition is performed modulo N.

Bus 43 synchronized signal connected to the first inputs of the trigger 6-9, the second input of these triggers

connected, with the output of the element 10-13 subsequent conversion channel. The second input of the trigger 9 of the last channel is connected to the high side of the element 10 of the first channel of formation. The outputs of each of the flip-flops 6-9 of each channel are connected to the first inputs of elements 10-17 of the same channel, and the outputs of elements 14-17 AND are connected to the inputs of element 18 OR, output 44

which is the output of the device. The operation of the multichannel pulse synchronization device is as follows.

in the initial state, triggers 6-9

is in the zero state, elements 10-17 are closed and, consequently, at the output 44 of element 18 OR there is no signal. Triggers 2-5 form N pulse sequences. Their frequency is equal to the reference frequency f of the multiphase generator 1, the phase shift between two adjacent pulse sequences is 2It | N, and the pulse duration C

equal to the integer number of j-i time intervals H between two adjacent phases of the multi-phase generator 1, i.e.

C - (j-).

The synchronized signal arriving at bus 43 sets triggers 6–9 to one state. These triggers, in turn, provide the enable potential to the first inputs.

elements 10-17 I. Each pulse arriving at the second input of the first elements 10-13, alternately passing through them, sets the main trigger of the previous channel to the zero state, which in turn closes the corresponding elements 10-17 I.

The correspondence between the reference frequency and the speed of the device elements is chosen so that each trigger and the corresponding logic elements have time to work for the N-1IN part of the reference period

frequencies. Therefore, the flip-flop of triggers 6-9 is completed in that one of these triggers remains in one state, and the rest in zero. However, only one of

N pairs of elements 10-17 I remain open and one sequence of pulses passes through the output 44 of the element OR 18 through one of the elements 14-17 AND, the pulse of which is located closest in time to the pulse of the synchronized signal.

Claims (2)

1. For the UK of UK number 1425517, cl. NRT, 1976. 2. USSR author's certificate No. 639133, cl. H 03 K 5/13, 1977. 23 L 17ZV- -L one