SU1615869A1 - Device for determining moments of appearance of extremes - Google Patents

Abstract

The invention relates to a pulse technique and can be used in analog-digital conversion devices. The purpose of the invention is to increase credibility. The device for determining the moments of occurrence of extrema contains two differentiating circuits 1, 2, comparators 3, 6, 7, AND-HE element 4 and D-flip-flop. The goal is achieved by eliminating the effect of false pulses caused by bounce on the front and the bottom when comparators 3, 6, 7 are in operation. D - trigger stores information, does not allow generating false output information. 2 Il.

Description

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The invention relates to a pulse technique and can be used in analog-digital converter devices.

The purpose of the invention is to increase the reliability by eliminating the influence of the bounce of the comparators.

FIG. 1 shows a block diagram of a device for determining the moments of occurrence of extremes; in FIG. 2 - time diagrams that show the work.

The device for determining the moments of 1t of occurrence of extrema contains I first 1 and second 2 differentiating circuits, first comparator 3, 2 2-HE 4, D-flip-flop 5, second | 6 and third 7 comparators, input 8 | and output 9 bus, while the input | bus 8 is connected to the inverting I input of the first comparator 3 through: the first differentiating circuit 1 and directly to the inverting input of the third comparator 7, the output connected to the R input D-; trigger 5, the output of which is connected by the IC output bus 9, and tact; input - with the output of the element 2I-NOT 4, cat inputs Oogo connected to the outputs of the Comparators 3 and 6, while the output; and the input of the second differentiating circuit 2 is connected to the inverting inputs of the | first 6 and second 7 comparators; respectively.

The device works as follows.

The input signal is fed simultaneously to the non-inverting input of the third comparator 1 to on. the input of the first differentiating circuit 1. At the output of the third comparator 7, a pulse of positive polarity with a duration coinciding with the duration of the input signal (fig2) is formed. From the output of the first differentiating circuit 1, the signal enters the second differentiating circuit 2 and the inverting input of the second comparator 6. The shape of this signal is such that the moment of its crossing through zero coincides with the moment of appearance of an extremum at the input signal. At the output of the second comparator 6, a pulse is formed, the leading front of which corresponds to the moment of transition of the signal under study through a maximum, and the rear edge - to the moment of the end of the input signal, and at the front one.

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and at the trailing edge there are false impulses (front and fall bounce).

From the output of the second differentiating circuit 2, the signal enters the inverting input of the first comparator 3 (figure 2). The moments of intersection of this signal with the zero line coincide with the points of inflection of the input signal. As a result, a pulse is formed at the output of the first comparator 3, the leading edge of which corresponds to the first inflection point of the input signal, and the falling front - to the second inflection point.

The outputs of the second 6 and first 3 comparators are connected to the inputs of element 2I-NOT, as a result of which a negative impulse is formed at the output of this element, the leading edge of which coincides with the moment of transition of the signal under study through a maximum, and the back one with the second inflection point of this signal. This pulse is a trigger for the D-flip-flop 5 triggered. To the reset input R of the same trigger, the output of the third comparator 7 is connected. By decreasing the pulse coming from the output of element 2И-НЕ 4 the output of D-flip-flop 5 is set to one, and by the zero level of the pulse coming from the output of the third comparator 7 again zero. At the same time, the output signal will not contain false bounce pulses, the leading edge of this pulse will correspond to the moment of transition through the maximum of the signal under study, and the decay - to the moment of the end of the same signal.

The device has the following advantages: the output pulse does not contain false bounce pulses, which increases the reliability of the device without degrading the speed.

Claims (1)

Invention Formula A device for determining moments of occurrence of extremes, containing a first differentiating circuit, the input of which is connected to the input bus of the device, and the output is connected to the inverting input of the first comparator, the non-inverting input of which is connected to a common bus, characterized in that Z Jtf Uf