SU1267596A1 - Method of symmetrizing shape of pulse signal - Google Patents

Abstract

The invention relates to a pulse technique. It can be used to form periodic pulses of a strictly symmetric shape. The purpose of the invention is to increase the accuracy of symmetric pulses from the original asymmetric signal of an arbitrary shape in a given frequency range. A device for implementing the method comprises an input bus 1, an output bus 2, a synchronization pulse shaper 3 and two wide gates, first 4 and second 7 short strobe pulse shaper units, multiplying and summing unit 5, a low-pass filter 6. The two-frequency method provided for in the method: Stroboscopic conversion of the input signal, which is linear in a wide frequency range, ensures high accuracy of balancing (L of the generated signals. 1 hp, f-ly,, 5 ill.

Description

The invention relates to a pulsed technique and can be used to generate periodic pulses of strictly symmetrical shape.

The purpose of the invention is to improve the accuracy of balancing the shape of the pulse signal when generating symmetrical pulses from the original asymmetric arbitrary waveform in the frequency range.

In FIG. Figure 1 shows the signals (L is the synchronization pulse acting at the moments t _o and sets the position of the axis of symmetry on the initial signal; <5 is the initial asymmetric signal A (t); fe and r are the amplitude-modulated (AM) strobe sequences of the pulse pulses B (t) HC (t), which are discrete, time-stretched copies of the original asymmetric and mirror-like signals, respectively; e, e are wide, strobes each of duration ² ₍ = = (ml) 'I ·, symmetrically located on both sides, with which it is limited the region of symmetrization by the interval t (phi d. 16); to the output balanced signal D (f.); in Fig. 2 is a diagram of a device that implements the proposed method; in Fig. 3 is the same as a synchronization pulse shaper; in Fig. 4 are timing diagrams characterizing it work (a - signal at the first output;

- signal at the second output; B is the signal at the output of the former 17; signal at the third output of the shaper); in FIG. 5 is a diagram of the first and second shaper of a group of short strobe pulses.

The device contains an input bus 1, an output bus 2, a driver 3 of a pulse са synchronization and two wide gates generated at the first, second and third outputs, respectively, the first driver 4 of the group of short strobe pulses, a multiplication and summing unit, a filter.

low frequencies, and the second driver 7 of the group of short strobe pulses, while the driver 4, block 5 and the driver 7 have three inputs (first, second, third) and one output.

The input bus 1 is connected to the input of the driver 3, the first inputs of the first and second drivers 4 and 7 and the first input of the block 5. The first output of the driver 3 is connected to the second inputs of the drivers 4 and 7, the second and third outputs to the third inputs of the drivers 4 and 7, respectively5 respectively, the outputs of which are connected respectively to the second and third inputs of block 5, the output of which through a filter 6 is connected to the output bus 2.

Block 5 contains two multipliers ¹⁰ 8 and 9, the inputs of each of which are connected to the analog (first) and corresponding (second, third) pulsed inputs of block 5, and the output through the analog adder 10 to the output of block 5.

Shaper 3 contains (Fig. 3) serially connected pulse shaper 11, frequency divider 12, frequency multiplier 13, 20 short pulse shaper 14, pulse shaper 15, key 16 and serially connected pulse shaper 17, inverter 18 and key 19, as well as a key 20, connected 25 parallel to the multiplier 13. The common input of the shapers 15 and 17 is connected to the output of the shaper 14, which is the first output of the shaper 3.

In the formers 11, 15 and 17 provides for the adjustment of the duration of the output pulse.

The input of the shaper 11 is the input of the shaper 3, the second and _{third 3} 5 outputs of which are the second contacts of the keys 16 and 19.

The first and second shapers 4 and 7 are constructed basically similarly to the shaper .3 (Fig. 5). Each of them contains a pulse shaper 11 connected in series, a pulse frequency divider 12, a pulse frequency multiplier 13, a short pulse shaper 14 and a gating unit 45 21, the output of which is the output of the shaper 4 (7), and the gating input is the third input of the shaper 4 ( 7), the second input of which is the synchronization input 5θ of the frequency divider 12.

The method is implemented as follows.

Single-ended Source

A (t) with a frequency f and a duration of pulses and (Fig. 1§) is fed to the input of the shaper 3 and starts the shaper 11, the output of which forms a rectangular pulse.

With the key 20 closed, the multiplier 13 does not work, and short pulses with a frequency f ₃ = F = = - r, where m-Ι is the division coefficient t-1 of the divider 12 will appear on the first output of the shaper 3 (Fig. · 1 q. and Fig. 4 a).

In this case, a pulse is obtained at the output of the shaper 15, the duration of which is set = = (t-1) t, where 0 i is next to the pulse. At the output of the shaper 15, and at the output of the shaper 17, a pulse is obtained whose duration is set equal to

After the inversion at the output of the inverter 18, a pulse of duration длительн is obtained that precedes the pulse at the output of the driver 14.

In shapers 4 and 7, under the action of the initial signal A (t), two sequences of strobe pulses with frequencies f _y and f _{2 are formed} , and the duration of these pulses should be at least 2–3 times smaller than the period of the highest harmonic in the spectrum A (t ) The shaper 11, the divider 12 and the shaper 14 in the shapers 4 and 7 operate as in the shaper 3. In addition, the frequency pulse supplied to the second inputs of the shapers 4 and 7 synchronizes their operation, setting the divider 12 in its initial state and thereby providing phasing the first and second sequences of strobe pulses.

The pulse frequency multipliers 13 multiply the pulse frequency by a factor of t-2 in shaper 4 and m times in shaper 7.

The sequences of strobe pulses obtained in this way are multiplied in the multipliers 8 · and 9 with the original signal. The result is a simulated sequence of strobe pulses B (t) and C (t) (Fig. 1b, d), which are combined in the adder 10 and filtered, after which a symmetric signal D (t) is obtained (Fig. 1a ^.

To limit the duration of the output signal, the keys 16 and 19 are closed in the shaper 3. And the gates of the gates 4 and 7 receive pulses of duration t, in the shapers 4 and 7. Using the multiplier 13 in the shaper 3, the frequency fj can be increased.

Any change in the function A (t) describing the original signal inevitably entails the same change in its mirror copy, as a result of which the symmetry of the output signal 10 D (t) is not broken in the general case with an arbitrary shape of the pulse signal.

Thus, due to the use of a 2-frequency stroboscopic 15 conversion of the input signal, which is linear in a wide / (hundreds of kHz to GHz units) range / frequencies, the method of balancing provides greater accuracy of symmetry · 20 in the same frequency range, i.e. achieves a positive effect.

Claims (2)

The invention relates to a pulse technique and. can be combined to form periodic pulses of a strictly symmetric form. The purpose of the invention is to improve the accuracy of balancing the shape of a pulse signal during the formation of symmetric pulses from an initial unbalanced signal of an arbitrary shape in the frequency range. FIG. Figure 1 shows the signals (cL-synchronization pulse, acting at times t and specifying the position of the axis of symmetry on the original signal; 5 — the initial asymmetric signal A (t); b and 1 — amplitude-modulated (AM) strobe-pulse sequences B (t) HC (t), discrete, time-extended copies, respectively, of the original asymmetric and mirror signals; d, b - wide gates each with a duration, (t -1) t, symmetrically located on both sides t, with the help of which the region of symmetry is limited to the interval t (Fig. 1). 5); to the output symmetric signal D (t :); in Fig. 2 is a diagram of a device that implements the proposed method; ka. Fig; 3 is the same as a synchronization impulse generator; in Fig. 4 - time diagrams, characterizing its operation (a - signal at the first output ° - signal at the second output; L - s at the output of the driver 17; tsignal at the third output form l); in Fig „5 - a diagram of the first and second driver of the group of short strobe pulses. The device includes an input bus 1, an output bus 2, a synchronization pulse shaper 3 and two wide strobes generated at the first, second and third outputs, respectively, the first shaper 4 of a group of short strobe pulses, a multiplication and summation block, a low frequency filter, and a second waveform 7 groups of short strobe pulses, with the driver 4, the block and driver 7 have three inputs (first, second, third) and one output. Input 1 is connected to the input of the imaging unit 3, the first inputs of the first and second drivers 4 and 7 and the first input of block 5. First 6, the output of the former 3 is connected to the second inputs of the drivers 4 and 7, the second and third outputs with the third inputs of the drivers 4 and 7, respectively, the outputs of which are coupled respectively with the second and third inputs of block 5, the output of which is connected through the filter 6 to the output bus 2. Block 5 contains two multipliers 8 and 9, the inputs of each of which are connected to the analog (first) and corresponding (second y, the third) pulse, the inputs of block 5, and the output via analog cy fmatopop 10 to the output of block 5. Shaper 3 contains (Fig. 3) serially connected pulse shaper 11, frequency divider 12, frequency multiplier 13, shaper 14 short pulse shaper 15 pulses, a switch 16 and a serially connected pulse driver 17, an inverter 18 and a switch 19, as well as a switch 20 connected in parallel to the multiplier 13. The common input of the driver 15 and 17 is connected to the output of the driver 14, which is the first output of the driver 3, B ormirovatel x 11, 15 and 17 provides adjustment of output pulse duration. The driver input 11 is the driver input 3, the second and third outputs of which are the second contacts of the keys 16 and 19. The first and second drivers 4 and 7 are constructed basically similarly to the driver 3 (Fig. 5). Each of them contains a pulse generator 11 connected in series, a pulse frequency divider 12, a pulse frequency multiplier-13, a short pulse shaper 14, and a gating unit 21, the output of which is the output of the shaper 4 (7), and the gating input - the third input of the shaper 4 ( 7), the second input of which is the synchronization input of the frequency divider 12. The method is implemented as follows. The initial unbalanced signal A (t) with a frequency f and a pulse duration Ti and (Fig. 15) is fed to the input of the imaging unit 3 and starts the imaging unit 11, at the output of which a rectangular impulse is formed. When the key 20 is closed, the multiplier 1 does not work, and short pulses with a frequency f F - will appear at the first output of the former 3. where t-1 is the coefficient divided by the m-i divider 12 (FIG. 1 a and FIG. 4 a). At the same time, at the output of the imaging unit 15, a pulse is obtained, the duration of which is set to (t -1) g, where O t «1, following the impulse. At the output of the imaging unit 15, and at the output of the imaging generator 17, a pulse is obtained, the duration of which is the inversion at the output of the inverter receives a pulse with a duration of 4, preceding the pulse at the output of the former 14. In generator 4 and 7, two sequences of strobe pulses with frequencies f and f are formed under the action of the original signal A (t), and the duration of these impulses must be at least 2-3 times less than the period of the highest harmonics in the spectrum A (t), Shaper 11, divider 12 and shaper 14 in shaper 4 and 7 function as well as in shaper 3, In addition, the frequency pulse f arriving at the second inputs of the drivers 4 and 7 synchronizes their operation, setting the divider 12 to the initial state and thereby providing the phasing of the first and second strobe pulses. The multipliers 13 pulse frequencies multiply the pulse frequency by t-2 times in the shaper 4 and m times in the shaper 7. The strobe pulse sequences obtained in this way are multiplied in multiplier 8 and 9 with the original signal. The result is a promo-audited sequence of strobe pulses B (t) and C (t) (Fig. 1b, d), which are combined in the adder 10 and filtered, and a symmetric signal D (t) is obtained (Fig.). To limit the duration of the output signal in the driver 3, the keys 16 and 19 are closed. And the strobe inputs of the gating units 21 in the driver A and 7 receive duration pulses. Using the multiplier 13 in the driver 3, the frequency fj can be increased. Any change in the function A (t) describing the original signal inevitably entails the same change in its mirror copy, as a result of which the symmetry of the output signal D (t) is not violated in the general case with an arbitrary pulse signal. Thus, by using a 2-frequency stroboscopic conversion of the input signal, which is linear over a wide (hundreds of kHz to a few GHz) frequency range, the balancing method provides greater balancing accuracy in the same frequency range, i.e. achieves a positive effect. Claim 1. Method of balancing a pulse waveform, which consists in summing two signals mirror-symmetric about the axis of symmetry, whose position is given by the moment tp, and in subsequent filtering the sum signal, characterized in that, in order to improve the accuracy of the balancing when working in the frequency range of the original asymmetrical signal and with its arbitrary form, from the initial asymmetric signal of the frequency f (m - l) F, where that is 4, 5, ..., and the duration forms the first, second and third sequences These strobe pulses whose frequencies are chosen to be f Sl2 f - f and f - f, nT g - f - 3 - F. Phase the first and second strobe pulses so that their pulses coincide at times to the third pulse the strobe pulses and multiply the original asymmetric signal of frequency f with the first and second strobe pulse sequences and receive summable mirror-symmetric signals in the form of sequences of amplitude-modulated short pulses. 512675Q6 6 2. The method according to claim 1, characterized by multiplying the latter with the first u and with that, p. In order to form a second and second signal strobe sequence, a symmetrical part of the pulses is limited to intervals of the original unbalanced signal with a duration (m-1) t- on both sides with a duration t (- ", the execution time is 5 from Moment t. Phie. g Фцг.З FIG. ig.5