The pulse shaper stable duration

 

(57) Abstract:

The pulse shaper stable duration refers to the pulse technique and can be used as a shaper of stable pulses duration in different measurement Converter, timers, etc. technical result Achieved - improved stability of the pulse duration of the generated pulse. The pulse shaper stable duration contains the RS-trigger, power supply, circuit breaker, two resistors, two condensers, three managed key and the comparator. 1 Il.

The invention relates to a pulse technique and can be used as a shaper of stable pulses of duration for different measuring transducers, timer, etc.

Known standby multivibrator (see and.with. USSR N 974555, H 03 K 3/284, 15.11.82, bull. N42) that contains the trigger transistors of different conductivity type, timing capacitor, key discharge breathalyser capacitor to the transistor, the reference resistor, two current source with a common reference element for charging breathalyser capacitor and generate the reference voltage at the reference resistor and comparing the device.

A well-known shaper of stable pulses duration (Izmailov, A. M. and others - technology, 1992, N 10-11) containing RS-flop connected in series to the current source, the current interrupter, the timing capacitor and the reference resistor, the key discharge breathalyser capacitor, a comparator, a voltage follower and voltage divider.

In this device improved stability duration armasamaga momentum achieved through the use of a single current source for charging breathalyser capacitor and generate a reference voltage. However, the presence of such a device voltage follower and voltage divider constrain further increase the stability of the duration of the generated pulse under the influence of external disturbing factors.

Closest to the proposed device to the technical essence and the achieved result is a shaper rectangular pulses of stable duration (Izmailov A. M - radio engineering, 1996, N 1), containing the RS-flip-flop, connected in series to the current source, a circuit breaker, a control input connected to the first output of the RS-flip-flop, the first capacitor and the first resistor, one of the conclusions which the second capacitor, one of the conclusions connected with the other output of the second resistor, and another output from the common power bus, the first and second keys discharge, commuting findings are respectively connected with the conclusions of the first and second capacitors, and control inputs connected to the second output of the RS-flip-flop, a comparator, a first input connected to the first output of the first resistor, the second input with the first output of the second capacitor, and the output from the second input of the RS-flip-flop (R input). The first input (S-log) and the first output (direct output) RS-flip-flop are respectively the input and output devices.

In such a device to further increase the stability of the duration of the generated pulse is achieved by separation of circuits charge breathalyser capacitor and generate the reference voltage at the reference resistor, and connecting these circuits to the output of a single source of current through the breaker.

However, it should be noted that a further increase in the stability of the duration of the generated pulse in such a device is constrained by the instability of the residual stresses on breathalyser the capacitor after the discharge. It is made of the residual voltage U0key category all on the well-known formula =(Un-Uo)C/I, where Un=IR - threshold voltage created by the current I of the current source of the reference (first) resistor R; - capacity breathalyser (second) capacitor.

Thus, this device changes the voltage Uounder the influence of external disturbing factors (changes in the ambient temperature, voltage and. so on ) do not allow to obtain high stability of the duration of the generated pulse. Simultaneously, the presence component Uopromotes instability duration when the current change 1.

The task of the invention is to further improve the stability of the duration of the generated pulse through the practical exclusion of the influence of changes of the voltage Uofor the duration of the pulse.

This object is achieved in that in the pulse shaper containing RS-flip-flop, the first input and first output of which are respectively the input and output device, connected in series to the current source, a circuit breaker, a control input connected to the first output of the RS-flip-flop, the first capacitor and the first resistor, one of the conclusions of which is connected to a common power bus, the first managed key cog the output of the RS flip-flop a second resistor, one of the conclusions of which is connected to the output of circuit breaker, a second capacitor, one of the conclusions of which is connected to another output of the second resistor, and the other output from the common bus, the second driven key, switching the findings of which are connected to the findings of the second capacitor, and a control input connected to the second output of the RS-flip-flop, a comparator, a second input connected to one of the conclusions of the second capacitor, and the output from the second input of the RS flip-flop according to the invention, additionally introduced the third managed key the first switch output connected to the first output of the first resistor, the second switching output from the first comparator input and a control input connected to the pole (+) of the power source.

The combination of essential features of the characterizing part of the claims of the claimed device, allowing to increase the stability of the duration of the generated pulse through the practical exclusion of the influence of changes of residual stresses on breathalyser the capacitor for the duration of the generated pulse in the prior art is not detected, therefore, the proposed device meets the criterion of "substantial differences".

The inventive device includes RS-trigger 1, source 2 current, the circuit breaker 3 current, a first capacitor 4, the first resistor 5, the first managed key 6, the second resistor 7, the second capacitor 8, the second managed key 9, the comparator 10 and the third managed key 11.

In the scheme of the driver used the following functional elements: trigger 1 - chip (m/s) type TM, source 2 current built according to the scheme described, for example, in the book of P. Horovitz, U. hill "the Art circuitry". -M. : Mir, 1983, T. 1, S. 43; breaker 3 current keys 6, 9 and 11 m/s type CT, the resistors 5 and 7 type C5-5, the capacitors 4 and 8-type K-5, the comparator 10 - m/s CAT.

The shaper works as follows.

In the initial state of the shaper RS-flip-flop 1 is in the initial position on the first (direct) output valid signal is low logic level "0" and the second output (inverse) effect signal of a high logical level "1". The signal "0" from the first trigger output 1, acting on the control input V breaker 3 current, causes the opening of the switching conclusions X the last, which disables the output of a source 2 current. The signal "1" with the second trigger output 1, acting on the control inputs V pervoj ntinue conclusions of the first and second 8 capacitors, cause the discharge of the latter. The presence breaker 3 can reduce the residual voltage U4and U8the capacitors 4 and 8 to the values of residual stresses U6and U9on the closed conclusions X keys 6 and 9, components (6-8) mV, by eliminating the voltage drop by the current source 2 current resistance closed output X keys 6 and 9, i.e., U4=U6and U8=U9.

When the input device is generated pulse trigger 1 goes to another position on the first output valid signal "1", and the second signal is "0". When this switching outputs X of the circuit breaker 3 is closed and the switching conclusions X keys 6 and 9 are opened. Current I0source 2 current after the circuit breaker 3 is divided into two values: the current I1flowing through the first branch capacitor C4and the resistor R5and the current I2flowing through the second branch resistor R7and the capacitor C8. In the scheme of the shaper accepted values of C4=C8and R5=R7. Consequently, I1=I2=I and 2I=I0. The voltage on the capacitors 4 and 8 increase with almost constant slope, since the values of residual stresses U4and U8on UB> then U5=U7. Since the parameters of the same name elements of branches taken identical, it is assumed that the values of the currents I1and I2in the charging process of the capacitor 4 and 8 remain equal to each other. Upon reaching the condenser 8 of the voltage U= I /C+U8equal to the reference Un=IR5+U11(where U11- residual voltage between closed conclusions X key 11), i.e., when U=Unat the output of the comparator 10 occurs impulse that sets the trigger 1 in the initial position, specifying the shaper original state.

Because the keys 6, 9 and 11 are placed in the same enclosure chip (CT), we may assume that U6=U4=U9=U8=U11.

The duration of the pulse generated by the imaging unit, in this case, is equal to = R5-C8.

Thus, in the proposed shaper high stability duration of the generated pulse is achieved by compensating the residual voltage on the capacitor 8 (timing capacitor) residual voltage constantly public key 11. Because the keys 6, 9, 11 housed in the same casing chips, we can assume that the changes of residual stresses on the latest designs offer shaper showed the relative instability of the duration does not exceed (0,15-0,17)10-5.

Change the pulse width when the voltage changes at 2B (supply voltage 12V) are practically absent.

Shaper pulses containing RS - flip-flop, the first input and first output of which are respectively the input and output device, connected in series to the current source, a circuit breaker, a control input connected to the first output of the RS - flip-flop, the first capacitor and the first resistor, one of the conclusions of which is connected to a common power bus, the first driven key, switching the findings of which are connected to the findings of the first capacitor, and a control input connected to the second output of the RS - flip-flop, a second resistor, one of the conclusions of which is connected to the output of the circuit breaker, the second capacitor, one of the conclusions of which is connected to another output of the second resistor, and the other output from the common bus, the second driven key, switching the findings of which are connected to the findings of the second capacitor, and a control input connected to the second output of the RS - flip-flop, a comparator, a second input connected to the first output of the second capacitor, and the output from Veratrum output connected to the first output of the first resistor, second switching output from the first comparator input and a control input connected to the pole (+) of the power source.

 

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