SU706920A1 - Recirculation pulse shaper - Google Patents

Description

(54) RECIRCULATION FORMER ;; PULSES

  - 1 The invention relates to the field of radio engineering and can be used for the formation of pulses of calibrated duration in the metrological certification of time interval meters. A pulse shaper is known that contains an annular shifter, two elements of coincidence and a trigger jlj. Its disadvantage is the low shaping accuracy and the inability to control the duration of the output pulses. The closest to the invention is a shaper containing a delay cell, the logical element And, one of whose BXOjttoa is connected to the trigger code {2}. A disadvantage of the known former is the low accuracy of the forms. . -; . .., ...:,.,.; ...:.; ..;. The aim of the invention is to improve accuracy while simultaneously expanding the range of output pulses. The goal is achieved by the fact that a recirculating pulse shaper containing two delay elements, a trigger, an output is connected to the first input of the AND element, two OR elements are present, a second trigger and a counter, pulses, the first input of the second trigger is connected to the signal bus installation, to the first input of the pulse counter and to the first input of the first trigger, the second input of which is connected to the pulse counter, the second input; the latter is connected to Bbixofly of the first element OR, to the first input of the second element OR through the delay element and directly to the second input of the element whose output is connected to the second input of the AND element and through the second delay element to the first input of the first OR element, the second in the Turn of which is connected to the input In this case, the output of the element I is connected to the second input of the second trigger. 7 output of which is connected to the third input of the second element OR. The drawing shows a block-h: recirculation pulse former. . The recirculating pulse shaper contains the delay elements 1.2 elements OR 3.4, triggers 5.6, the pulse counter 7, the element AND g; - The recirculation pulse shaper operates as follows. A signal is supplied to the installation sirnal bus, which sets the triggers 5 and 6 to such steady states. at which the element AND 8 is closed by the output voltage of the trigger 5, and the element OR 4 from the trigger 6 receives the resolving voltage level. Signal. Set the scrap and also write to the counter 7 pulses of the return code N, which is proportional to the pulse impulse. Which should be wiiipcjbaH format. :. - - - The counter 7 pulses will be set to the state (Q -N), where Q is the capacitance, -; counter 7-.::: / -. / H -:: A short pulse of calibrated air is applied to the driver. which passes through the element OR 3 enters the counter 7, reducing the inverse unit recorded in it. The change in the state of counter 7 occurs by specifying the front of the output pulse of the element OR 3. This pulse Cd also enters one of the inputs of the element IGSh 4 directly, the input of the element OR 4 through the delay element 2. Thus, the two inputs of the element OR 4 step impulse signals of duration d, but delayed by each other relative to another 6 on the DT, i.e. for the delay time created by delay element 2. In the presence of a resistive level, eg a media at the third input of the OR 4 element, a pulse signal with a duration of SD-dT is formed at its output, which through the delay element 1 ttocTynaet and the second input of the OR element 3. Next, the process Circulation of the pulse in each cycle, increasing from: to the value of dT, will occur until Teit then the counter 7 will not overflow. In other words: the process of circulation of the pulse in a closed circuit (elements 3,2,4,1) will stop when this momentum It teaches increments the value N / iT. For this, when the counter 7 reaches the state (Q - 1), the trigger 5 is set to the second steady state, in which the element 8 is opened. The installation of the trigger 5 occurs by the falling edge of the corresponding state Q - 1 of the counter 7. This, in the turn indicates that | si-l circulation cycles occurred in the circulation circuit. Thus, by the time of the beginning of the N-ro cycle, the inverting element I 8 opens and the Nth reverse pulse arrives at the output of the former and sets trigger 6 to the second steady state, at 5 which the circulation process is disrupted. The duration of the output pulse of the imager is equal to Bb, x, 8. The delay T of delay element 1 determines the upper limit of the range 1 of the duration of the generated pulses and the lower limit is determined by the value I0 i. The recirculating pulse generator allows, without increasing the volume of the equipment, to increase: the pulse shaping accuracy can be as long as tenths of a nanosecond. The formulas and the fossil and the recirculation pulse shaper, containing two elements of the backstop, trigger, the output of which is connected. To the first input of the element I, which differs with the fact that, in order to increase accuracy while simultaneously expanding the range of the output-output pulse length, two OR elements, a second trigger and a pulse counter, are introduced into it, the first input of the second trigger is connected to the installation signal bus, to the first input of the pulse counter and to the first input of the first trigger, the second input of which is connected to the output of the pulse counter, the second input of the pulse counting is connected to the output of the first element OR to the first input of the second element OR via the ment delays and directly to a second input of the OR gate, whose output is connected to the second input of AND gate and via a second elementzaderzhki to the first input of the first OR gate, the second input of which is connected to the input. bus, while the output element And is connected to the second input of the second trigger, the output of which is connected to the third input of the second element OR.

Sources of information taken into account during the examination 1. USSR author's certificate No. 519854, cl. H 03 K 5/13, 2JA.O3.72. 52. USSR author's certificate

f9 457175, cl. H 03 K 5 / 13,26.01.73 ,.

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