SU725210A1 - Pseudorandom signal generator - Google Patents

Description

The invention relates to radio-measuring equipment and can find application in measuring the amplitude-frequency characteristics of quadripoles by the spectral method. 5

Known generator of a pseudo-random sequence of pulses, containing a clock generator and a shift register with linear feedbacks. However, the working frequency band, determined on May 10 by the pulse length of one generator position, is relatively narrow, which does not allow it to be used to study many broadband devices. fifteen

The closest in technical essence is a pseudo-random signal generator containing a clock, a shift register, a shaper, a trigger, AND elements, an adder. But this generator, although it provides a uniform signal spectrum, also has an insufficiently wide band of operating frequencies.

The aim of the present invention is to expand the operating frequency band of the generator by changing the pulse of one position. To achieve this goal, a pseudo-random signal generator containing a clock generator, a linear feedback shift register 30, a pulse shaper, a delay line connected in series, a pulse shaper and a pulse distributor, the first input of which is connected via a delay line to the output of the clock pulse and with shift register input with linear feedback, the second input with shift register output, and the first and second outputs with pulse shaper inputs c, the outputs of which are combined and are the output of the generator.

In FIG. Figures 1 and 2 show a block diagram of a generator and voltage time diagrams, respectively.

The pseudo-random signal generator contains a clock pulse generator 1, a delay line 2, a shift register 3 with linear, linear feedback, a 4 pulse distributor, 5, 6 pulse shapers.

Shaper 5 generates short pulses of positive polarity, and shaper 6 generates pulses of negative polarity.

The pseudorandom signal generator operates as follows.

Clock pulses of the generator 1 (Fig.

2a) go to the input “Shift” of the register (Fig. 2b) and through the delay line 2 to the first input of the distributor 4 (Fig. 2c).

'3' Register 3 generates an M-sequence of rectangular pulses, which are fed to the second control input of the distributor 4. At a high level of the M-sequence, clock pulses are fed to the input of the shaper 5 (Fig. 2, d), and at a low level - to the input of the shaper 6 (Fig. 2, 5). As a result, a sequence of short pulses, manipulated in polarity, according to a pseudo-random law (Fig. 2e), is formed at the output of the generator. The spectrum of such a signal can be written in the form - Gi-Rt, where Gi is the discrete spectrum of the periodic sequence of short pulses with a period equal to the period of the M-sequence;

Ri is the lattice function of the structure factor of the M-sequence.

_{R. =;} / appt, where N is the period of the M-sequence.

Thus, the pseudorandom signal generator compares favorably with the known ones, since it allows you to significantly expand the operating frequency band without increasing the speed of the digital element base, which will significantly expand its scope.

Claims (1)

Claim A pseudorandom signal generator comprising a clock generator, a linear feedback shift register, a pulse shaper, characterized in that, in order to expand the operating frequency band of the generator, a delay line, a pulse distributor and a pulse shaper are additionally introduced into it, moreover the second input of the pulse distributor 20 is connected through a shift register with linear feedback to the output of the clock generator and the input of the delay line, and the output is additional of the pulse shaper 25 is connected via a main pulse shaper to the second output of the pulse distributor. Figure 2 NPO “Search” Order 529/9 Ed. № 240 Circulation 995 Subscribed Printing house, 2 Sapunova ave.