SU1238256A2 - Device for generating bipulse signal - Google Patents

Abstract

The invention relates to the field of telecommunications. The speed increases without reducing the accuracy of bi-pulse signal formation as compared to -avt. St. No. 1172045. The device contains a digital signal source 1, a clock source 2, a trigger (T) 3, an output matching unit 4, a divider 5 frequencies into two, and an ELIMINATOR OR 6 and 7 elements. The goal is achieved by introducing T B, connecting output divider 5 through T 8 to the input of the EL-EXCLUSIVE OR 6 and connection of the inverse output of source 2 with the C-input T 8. 2 Il. 3 (L with to

Description

The invention relates to the field of telecommunications, can be used in digital transmission systems and is an improvement to the invention by the author. St. 1I720A5.

The purpose of the invention is to increase the speed without reducing the accuracy of bi-pulse signal formation. . Fig. 1 shows the structural electrical circuit of the device for generating a bi-pulse signal; Fig. 2 shows timing diagrams explaining its principle of operation.

A device for generating a bi-pulse signal contains a source

1 digital signal, clock source 2, trigger 3, output matching unit 4, frequency divider 5 into two, first element 6 EXCLUSIVE OR, second element 7 EXCLUSIVE OR, and additional trigger 8.

A device for generating a bi-pulse signal operates as follows.

The digital signal source 1 forms a digital signal {chart, fig.2o). From the direct output of the source

2 sync signal to the input of the splitter 5 frequency for two receives a clock frequency signal (chart, Fig.26). The signal from the output of the frequency divider 5 into two (diagram, fig.2g) arrives at the D input of an additional trigger 8, to the C input of which an active frequency signal arrives (diagram, diagram 25) from the inverse of the output of the clock 2. At the output of the additional trigger 8, a signal is generated (diagram, fig. 2z), similar to the signal at the output of frequency divider 5

by two, ahead of him by half the clock interval. As a result of adding modulo two signals from a source 1 of a digital signal fed to one input of the first element 6 EXCLUSIVE SHW, and a signal from the output of an additional trigger 8 fed to the other input of the first element 6 EXCLUSIVE OR, a signal is formed (chart, fig.2e) to

five

0

five

firstly, the D-input of trigger 3 arrives. This signal is counted by a clock frequency sequence from the inverse output of the source 2 clock signal. The output signal from flip-flop 3 (the diagram, FIG. 2l modulo-2 folds up with the output signal of the frequency divider 5 by two on the second element 7 EXCLUSIVE OR, the output of which, taking into account the delay relative to the original digital signal, is formed by an absolute bi-pulse signal ( , figure 2) .This signal by the output matching unit A of the drive pin to a form suitable for transmission over the communication line.

The speed of the proposed device is limited by the amount of time shift t at the C input of an additional trigger 8 (diagram, figure 2) relative to the signal at its D input. The value of t must be not less than a certain permissible time of the chich. The maximum speed of operation is reached when t t. At the same time, the duration of the clock interval T T is the minimum and fairness of equality t, 0.5 - -t ,. Accepting at t, and equal to the typical delay time for the selected element base t, we get 4t.

Claims (1)

Invention Formula Device for generating a bi-pulse signal according to the ed. St. No. 1172045, different 40 by the fact that, in order to improve performance without reducing the biopulse signal formation accuracy, an additional trigger was introduced into it, and the output of the frequency divider was 45 two through an additional trigger is connected to another input of the first element EXCLUSIVE OR, and the inverse output of the source of the sync signal is connected to the C input of an additional 50 trigger. fue.Z