SU1506526A1 - Square pulse shaper - Google Patents

Abstract

The invention relates to radio electronics and can be used in measuring, computing devices and automation devices to form a group of overlapping pulses with mutually inverse sequences of their fronts and decays. The purpose of the invention is to improve the accuracy, stability of the output pulses, the expansion of the scope. The rectangular pulse shaper contains a source of 1 multiphase pulses and N combinations of two logical elements, AND-NOT 2, 3 (4, 5) and two logical elements OR-NOT 6, 7 (8, 9), two elements each, with source 1 of multiphase Pulses contains a generator of 10 rectangular pulses. The introduction of multiphase pulses of Johnson's ring counter 11 into the source 1 allows to increase the accuracy of operation by eliminating the regularity of pulse repetition, and to form a larger number of output signals. 3 il.

Description

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source 1 of multiphase pulses and n combinations of two logical elements AND NO 2.3 (4.5) and two logical elements OR NOT 6.7 (8.9) two elements each, and the source 1 of multiphase pulses contains a generator 10 coal impulses. Introduction B, the source 1 of multiphase impulses, pulses of the ring counter 11 Johnson, allows to increase the accuracy of operation by eliminating the regularity of pulse repetition, and to form a larger number of output signals. 3 il.

The invention relates to radio electronics and can be used in measuring, computing devices and automation devices to form a group of overlapping pulses with mutually inverse sequences of their fronts and decays.

The purpose of the invention is to increase accuracy, stability of the output pulses, the expansion of the field of application.

FIG. 1 is an electrical schematic diagram of the arrangement in FIG. 2 is a generator of rectangular pulses in FIG. 3 - time diagrams of work.

The rectangular pulse shaper contains a source of 1 rectangular pulses, AND-NOT 2-5 logic elements and OR-NOT 6-9 logic elements, of which at least one combination of two elements of two AND-NOT elements and two elements is formed OR NOT (for example, combinations containing elements 2 and 6.3 and 7.4 and 8, 5 and 9, 2 and 3, 4 and 5, 6 and 7, 8 and 9), with the first and second inputs of any element AND NOT 2-5 of the combination connected to the like - direct (A, B, C, D) or inverse (A, B, C, D) outputs of source 1, located symmetrically with respect to its middle, the first and the second inputs of different types of elements 2,6 and 3,7 combinations are combined. Source 1 is made on series 10 rectangular pulses connected in series and an annular closed shift register 11 with cross feedback, paraphase bit outputs are connected to the direct and inverse outputs of source 1, respectively.

Source 1 can be executed (see Fig. 2) on a generator of 10 rectangular pulses and a counter 11 (Johnson) on a register with cross-section 5

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By feedback, the inputs F and H of which are connected to the outputs of the generator 10, and the paraphase outputs of the bits executed on the triggers 12-15 are respectively to the direct and inverse outputs of the source 1.

The generator 10 (see FIG. 2) may comprise an auto-generator of 16 pulses, a counter of 17 pulses, and a decoder 18.

Counter 17 can consist of a counter 19 connected in series with a division factor of 8 and a counting trigger 20. Decoder 18 consists of a combination of AND-NE 21 and OR-NOT 22 and 23 logic gates, whose outputs H and F are generator outputs 10.

Shaper works as follows.

The auto-oscillator 16 B1 is outputting the signal G (FIG. 3, curve G) in the whole field of a series of rectangular pulses with a constant repetition rate. The counter 17 counts these pulses, periodically full. In this case, at the output CO of transfer of counter 19, a signal f is formed (curve P) with a repetition period equal to eight repetition periods of signal G and a duty cycle of 2, and at the direct output of flip-flop 20 a signal E (curve E) with twice the period. On viiode P (curve P,) of counter 19, a positive pulse is formed with a repetition period the same as that of the Pic signal with a duration equal to the repetition period of the signal G.

From the listed signals, the decoder 18 generates the output signals H and F (curves H and F) of the generator (according to the logical equations, the logic is positive)

The signal H is fed to the input of the zero setting of the counter 11 (see Fig. 1) and sets it to the zero state, in which all the code signals A, B, C, D correspond to a logical zero, thus all faults and forbidden states are corrected. in the counter, which may occur both during power up and during operation.

The signal F is fed to the counting input of counter 11. In accordance with the principle of operation of counter 11, the first four edges of the signal F (after the next positive pulse of the signal H) are successively filled with the logic of the trigger with logical units, and the subsequent with the logic of the front with logical zeroes. As a result, at the outputs of counter 17, a group of signals A, B, C, D (curves A, B, C, D) is formed in the form of pulses partially overlapping in time with the same sequence of fronts and decays.

Of the signals A, B, C, D and their inversions, the logic elements 4,2,6,8 form the output signals a, b, c, d of the driver, and the logic elements 9j, 7,3,5 form the inversions a, b, c d output signals, respectively, the formation is performed in accordance with the logical equations

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Thus, at the outputs of logical elements, a group of paraphase output pulses with mutually inverse sequences in time of their fronts and decays is formed.

The number of pairs of output pulses can vary from two to infinity by changing the number of triggers in the counter 11 and the logic elements connected to its outputs. With an odd number of specified triggers, the outputs of the middle are used as the outputs of the driver directly, the logic elements, similar to the elements of 3,4,5, are not connected to the outputs of the middle trigger.

The regularity of the individual output pulses can be broken by applying from the outside additional logic signals to the additional inputs of the logic elements 3-5.

In the absence of the need for a complete set of output signals of the driver, some of the logic elements 3-5 can be excluded.

The basic electrical circuits of the generator 6 are completely determined by the desired location on the time axis of the pulses of the signal F. The signal H may be absent, since the elimination of failures and forbidden states in the counter (Johnson) may be performed by other known methods. Elements 10 and 11 can be performed on a different element base.

Compared to the known square pulse drivers with mutually inverse sequences of their fronts and decays, the proposed driver allows you to form any number of single-phase and para-phase signals by making it possible to easily change the number of bits in the counter 11 and logic elements connected to its outputs, and also allows disrupting the regularity of the output signals due to the possibility of connecting additional logic signals to additional inputs of logic elements.

The use of the invention expands the functionality of the former, enhances its accuracy, stability and manufacturability, reduces the weight and size, and increases the flexibility of application in electronic devices.

Claims (1)

Invention Formula A shaper of rectangular pulses containing a source of multi-phase rectangular pulses and n combinations of two logical elements AND-NOT and two logical elements OR-NOT two elements, where n 1,2 ..., with the first and second inputs of any element of the combination connected to the same direct or inverse outputs of the source of multiphase rectangular pulses located symmetrically with respect to its middle, the first and second inputs of different types of combination elements are combined, with the source of multiphase rectangular impulses It contains a generator of rectangular pulses, about t71 In order to increase the accuracy, stability and expansion of the field of application by ensuring the irregularity of the formation of output signals, a ring counter (Johnson) is inserted into the source of multiphase rectangular pulses on a closed shift register 5065268 cross-linking, the input of which is connected to the output of the generator of rectangular pulses, and the parafaen outputs of the bits of the counter are connected respectively to the direct and inverse the outputs of the source of multi-phase right-angle pulses.