SU1453610A1 - Multilevel regenerator of bipolar signals - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to improve the accuracy of regeneration by reducing the jitter of the pulse phase of gating. The multilevel regent. The ator contains the amplifier 1, the block 2 of the automatic gain control, the threshold blocks 3 and 4, the adder 5, the selector 6 time intervals, the selector 7 clock frequency and the shaper 8 linear signal. The use of threshold blocks 4 with selected threshold levels with a further selection of pulses at the output of adder 5 makes it possible to reduce the operation of information pulses according to the duration at the input of the slider 7, while not reducing their number. This leads to a reduction in the phase jitter of strobe pulses and improves the accuracy of the recovery of the strip by non-calibrating signals by a multilevel renevererator. 2 Il.

Description

The invention relates to telecommunication technology and can be used in digital systems.

The purpose of the invention is to improve the accuracy of regeneration by reducing the jitter of the phase of the strobe pulses.

FIG. ’Is a block diagram of a multi-level regenerator;

time interval selector circuit. Multi-level regenerator soder ™. the input amplifier .. amplifier 1, block 2 of the automatic automatic gain adjustment, η-1 threshold blocks 3, a-1 additional threshold blocks 4, adder 5, time selector 6: intervals, clock selector 7, output signal shaper 8 of the linear signal. Selector 6 time slots ki,

12, (5 consists of blocks 9 and 10 of the delayed element NOT 11. element OR elements AND 13 and 1 / · and trigger 15.

A multi-level regenerator operates as follows.

The input multilevel bipolar signal through the input amplifier I with block 2 of automatic adjustment is fed to the inputs η-1 of threshold blocks 3 and additional threshold blocks 4, information from the output of threshold blocks 3 is transmitted to the inputs output driver 8 of a linear signal, the course of which normalized by cell and duration of different-polarity pulses are transmitted in line.

At the outputs of the additional threshold blocks 4, rectangular pulses are formed, which then ¹ are fed to the adder 5, The response levels of the additional threshold blocks 4 are selected so that the carbon pulse levels had a width. ”Pulses of different levels have a shape and vary in amplitude. Consequently, at equal levels with respect to the natural amplitudes, these pulses will have an average width, In particular, levels equal to half the natural amplitudes, these pulses have the same average width equal to half the clock interval (in this case, the clock signal has a maximum energy) .

With you ~ you-35, so that the direct outputs of the unequal average of the digital signal have the same

To reduce the blur from all pulses at the output of the adder. 5, only those with an average width within fT / 2t ^ T) should be selected, and due to the appropriate selection of threshold levels of threshold blocks 4, information pulses of all levels fall into this limit, and therefore , their number does not decrease. The selection of information pulses at the output of the adder 5 is performed using the selector 6 time intervals, the output of which is a sequence of rectangular pulses purified from the influence of pulses of neighboring levels. The blur of the pulse at the output, the time interval selector, is equal only to the blur from the influence of interference.

Thus, the use of threshold blocks with selected threshold levels, with further selection of pulses at the output of the adder, allows one to reduce the fluctuation of information pulses in duration at the input of the clock selector, without reducing their number. This leads to a decrease in the jitter of the phase of the strobe pulses and increases the accuracy of the recovery of the regenerated signals by a multilevel regenerator.

The ft selector works as follows. The signal from the output of the adder 5 is fed to the input of the selector 6. Blocks 9 and 10 delay set the necessary selection intervals. At the output of element And 13, a pulse is formed, which is fed to the information input of the P-trigger 15. The width of this pulse is chosen equal to the permissible blur of information pulses. At the moment the negative edge of the information pulse acts on the gate input from the B-trigger

Ϊ5, in the presence of an enable signal to the input setting D ^'1 D-flip-flop 15 at its inverse output pulse will have to appear lyatsya shenie element which ί 14 gives razrepropuska this informatsionnrgo pulse that has entered the spacing; selection "

Impulses of greater or lesser duration of the selection interval at the output of AND element 14 will not pass.

Claims (1)

Claim . A multilevel bipolar signal regenerator containing an output driver of a linear signal, the gating input of which is connected to the output of the clock selector, and the information inputs are connected to the outputs η-l of the threshold blocks (where η is the number of levels of multi-level 1 linear signal), the inputs of which are connected to the output of the input amplifier, the control input of which is connected to the output of the automatic gain control unit, the input of which 1 is connected to the inputs η-l of the threshold blocks, characterized in that, p. In order to reduce the regeneration accuracy by reducing the jitter of the phase of the strobe pulses, η-l additional threshold blocks and series-connected adder and time interval selector are introduced, the inputs η-l of additional threshold blocks connected to the output of the input amplifier, and the output to the inputs of the adder, output the time slot selector is connected to the input 5 of the clock isolator house. fio. 2