SU1252797A1 - Integrator of pulsed voltage - Google Patents

Abstract

The invention relates to instrumentation engineering, in particular, to the field of analog conversion of the temporal parameters of single or periodic voltage pulses, and can also be used as a time setting element having a large constant) in (EP. Purpose of the invention and design). integration accuracy. The integrator contains a composite power amplifier 1 repeater on two transistors 1, 2, the main and additional integrators, and the capacitors 3 and A, one of which

Description

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The invention relates to analog and instrumentation engineering, in particular, to the field of analog conversion of the temporal parameters of single or periodic voltage pulses, and can be used as a time master element having a large time constant.

The purpose of the invention is to improve the accuracy of integration.

The drawing shows the scheme of the integrator.

The integrator contains composite emit-20

of its former charge voltage, will be sealed significantly by the increased resistance of the transition, which will increase the time constant of this link.

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A termination repeater made in the 5 emitter of transistor 1 does not change the two transistors 1 and 2, the main

and additional integrating capacitors 3 and 4, one of which 3} is connected parallel to the collector-base junction of transistor 2, and the other parallel to its base-emitter junction, with E # 1 coupler connected)

The integrator works as follows.

In the initial state, the transistors 1 and 2 are in active mode,. Integrated capacitor 3 is charged to voltage (, s-s integrated capacitor 4 - to voltage), Ujfg,

With the arrival of a positive input pulse, the transistor 1 goes into saturation mode, which increases its collector G: current, much like a 1.1C11C1 transistor 2. This state of transistors 1 and 2 corresponds to a decrease in the voltage drop across the collector-emitter junction voltage and the base – emitter junction of transistor 2, as well as the accumulation of the excess charge of minority carriers at the base of transistor 2, Since the transition to this state occurs under the influence of increased currents, the voltage across the capacitor The switches 3 and A occur relatively quickly and a positive foron of the output pulse is generated on the external resistor 5 with practically no delay.

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But a decrease in the collector current of transistor 1 means and a decrease in the base current of transistor 2, 25 which means that the capacitance A of the capacitor, which registers the drop, the voltage across the base junction A - the emitter of the transistor does not change its former voltage, will become more and more resistant course, which will increase the constant time of this link.

Thus, as the excess charge dissolves, the potentials of the emitters of the transistors 1 and 2 will decrease in the direction of decreasing with the speed specified by the constant values of the indicated links and practically without the influence of the lower link, which is the load resistor 5, until the transition process is over, thus ensuring the dependence of the constant intrinsic integration time on the value of this resistor, this is the essence of the func- tioning of the circuit. It should be noted that the operation of the circuit will occur in accordance with the description under the condition that the time constant of the load prices will remain rather small compared to the constant time of the links: collector - emitter transist 1 and base - emitter of transistor 2,

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Fixing the position of the working points of the transistors 1 and 2, corresponding to large current and collectors and smaller collector-emitter and base-emitter transitions, continues during the input pulse. After it ends

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 transistor 1 instantly acquires a zero potential, however, its emitter cannot also quickly track this change, because the excess charge accumulated in the base of the output transistor 2 will have a locking effect on the base – emitter transition, resulting in its operating point the cut-off area and simultaneously with a decrease in the collector current, the resistance of the collector-emitter junction will increase. The capacitance of the capacitor 3, fixing the voltage drop at the junction collector -

its former charge voltage, will be sealed by a significantly increased resistance of the transition, which will increase the time constant of this link.

transistor 1 emitter, do not change

But a decrease in the collector current of transistor 1 also means a decrease in the base current of transistor 2, as a result of which the capacitance capacitance A, which fixes a drop, the voltage at the base junction A - the emitter of transistor 2, does not change its former voltage, will become more and more resistive transition, which will increase the time constant of this link.

Thus, as the excess charge dissolves, the potentials of the emitters of transistors 1 and 2 will change in the direction of decreasing with the speed specified by the time constant of the indicated links and practically without affecting the lower link, which is the load resistor 5, to those until the transient process is over, thereby ensuring the independence of the constant integration time on the value of this resistor, this is the essence of the functioning of the circuit. It should be noted that the operation of the circuit will occur in accordance with the description provided that the time constant of the load prices will remain rather small compared to the time constant of the links: the collector - emitter of transistor 1 and the base - emitter of transistor 2,

Thus, in the proposed integrator, PPG is ensured. The constant integration of the load value changes over a wide range.

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Claims (1)

Invention Formula A pulse voltage integrator containing a composite emitter follower made in the form of the first s and second transistors, the collectors of which are combined and connected to the positive supply voltage bus, an integrating capacitor, one of the plates of which is connected to the emit-JO by the first and second base of the second transistors, and a friend - with their collector V. Petrash 4622/50 Compiled by A. Maslov Tehred I. Veres Co Po Circulation 671 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 7974 . and a load resistor, one output of which is connected to the emitter of the second transistor c to the output of the integrator, and the other terminal is connected to the negative supply voltage, the base of the first transistor being the input of the integrator, in order to increase the integration accuracy, it contains an additional integrating capacitor, which is connected between the base and the emitter of the second transistor. Proofreader I.Musk Subscription