Pulser

 

(57) Abstract:

The invention relates to a pulse technique. Pulser contains a Schmitt trigger (1), the resistor (R) (2), the condenser (K) (3), an additional resistor (4). The connection point P (2) and (3) is connected to the input of the trigger (1), the inverted output of which is connected with the free o R (2), R (4) is included between the free output To (3) and direct output of the trigger 1. The technical result - the reduction of the frequency of the generated pulses while maintaining frequency stability. 1 Il.

The invention relates to a pulse technique and can be used in computer equipment and control systems.

Known pulser (see the book: I. S. Potemkin. The functional components of digital automation. -M.: Energoatomizdat, 1988, S. 240, Fig. 7.9 (a), containing the serially connected first and second inverters, the resistor and the capacitor, the first conclusions which are connected with inputs of the first inverter. A second output resistor connected to the output of the first inverter and the second output capacitor with the output of the second inverter.

The disadvantage of this generator is, firstly, the presence at the input of the first insertnote and positive regarding the level of logical "1" polarity, which is invalid for integrated circuits and can lead to failure of the first inverter.

The disadvantage of this generator is also the ability to hover in a state where the first inverter is in linear mode when its output voltage equal to the threshold, and the second inverter in one of the logic States depending on the ratio of the trip thresholds of the inverters. The cause of the hang is inequality trip thresholds due to processing variations.

Known pulser (see USSR author's certificate N 674202 from 02.02.77, MKI H 03 K 3/281, the Oscillator rectangular pulses. Yu Century Arilou. - Publ. 15.07.79. Bull. N 26), which is the prototype, containing an integrator in the form of a serially connected resistor and capacitor, the connection point (the output of the integrator) is connected to the input of the Schmitt trigger, the inverted output of which is connected with the free output resistor (the input of the integrator), the free lead of the capacitor is connected to a common bus.

The Schmitt trigger has two series-connected logic gate (inverter) and two resistors, one of which is the input of the trigger Shmitta through another resistor to the output of the second logic element is connected to the input of the first logic element.

Prototype free from flaws similar.

The disadvantage of the prototype is the high frequency of generated pulses due to the low efficiency of the capacitor.

The frequency of the generated pulses, in principle, can be reduced by increasing the resistance of the resistor integrating RC circuit included in the circuit is a negative feedback. However, the value of the specified resistance bounded from above, since the increase in resistance increases the instability of the frequency of the generated pulses at the input current of the first logic element and the output voltage of the second logic element.

Analysis Schmitt, used in the prototype, held in the book: Zeldin E. A. Digital integrated circuits in information-measuring equipment. -L. : Energoatomizdat, 1986, S. 198 - 199. The outline of the prototype can be simplified by using as a trigger Schmitt specialized logic element, for example, TL (ibid S. 197). However, the prototype becomes sensitive to the effects of interruptions in the power supply, which discharges the timing capacitor RC circuit through the diode protection circuits input circuits is the generator of rectangular pulses, low frequency output pulses without increasing the capacity of the capacitor.

The technical result consists in reducing the frequency of the generated pulses is achieved by the fact that the generator of rectangular pulses containing a serially connected resistor and capacitor, the connection point which is connected to the input of a Schmitt trigger, the inverted output of which is connected with the free output resistor, an additional resistor between the free lead of the capacitor and the direct output of the Schmitt trigger.

This set of features allows you to reduce the frequency of the generated impulses by increasing the efficiency of use of the capacitor by providing overcharge of the capacitor in the process and increase the time constant of the timing circuit without increasing the resistance of the resistor negative feedback.

The figure shows the electrical circuit of the pulser.

Pulser contains a Schmitt trigger 1, resistor 2, a condenser 3, an additional resistor 4.

The connection point between the resistor 2 and capacitor 3 connect the EN between the free lead of the capacitor 3 and the direct output of the trigger 1. The resistors 2 and 4 are chosen to be equal (R2=R4=R).

Pulser operates as follows.

When the power is turned on, the capacitor 3 is discharged, the input trigger 1 due to the equality of the resistances of the resistors 2 and 4 level is set to E/2, where E is the supply voltage. Depending on the values of the thresholds of the trigger and release the trigger 1 is installed in one of the stable States. For example, the trigger 1 is established in the state of logical "1" when the direct output is a logic level "1", and the inverted output is a logic level "0". The capacitor 3 starts charging in a negative direction through the registers 2 and 4. The voltage at the input of the trigger 1 is reduced. When the threshold is reached, release the trigger 1 is switched to the state of logical "0". At this point, the voltage on the capacitor 3: Uc0=- E-2U0), where U0- threshold release the trigger 1.

After switch trigger 1 capacitor 3 starts to charge in a positive direction. The voltage at the input of the trigger 1 is increased. When reaching the threshold trigger 1 is switched to the logical state "1". At this point, the voltage at koanlogic way.

The time constant of timing circuit of the considered generatorC= 2RC. The period T of the pulse repetition generator can be defined as the sum of the two half-periods:

< / BR>
The time constant of timing circuit prototypep= RC. The pulse repetition period

< / BR>
From the comparison of these expressions shows that vimasuma RC-circuit in the inventive generator is similar to a conventional integrating RC circuit used in the prototype, but is increased in 2 times the time constant, which determines the corresponding decrease in the frequency of the generated pulses without increasing the resistance of the resistor negative feedback, and hence without compromising the stability of the frequency. At the same time in the scheme provided resistance to the impact of short-term power interruptions.

Made laboratory model of the generator of rectangular pulses, tests confirmed the feasibility and practical value of the proposed object.

Pulser containing serially connected resistor and capacitor, the connection point which is connected to the input of the Schmitt trigger, the inverted output of which is connected with the free pickup is instore and direct output of the Schmitt trigger, and the resistance of the resistor and the additional resistor are equal.

 

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