SU1408523A1 - Flip-flop multivibrator - Google Patents

Abstract

The invention relates to a pulse technique and can be used as a generator of high-duty pulses in micropower digital circuits. The invention allows to increase the duty cycle of the relaxation oscillations of such a generator. Preferred multivibrator can be manufactured by planar or thin-film semiconductor technology. Topologies for making transistors are combed. The geometrical dimensions of the transistors 2 ,, 4, and 12 may be equal to each other or differ with different concentrations of dopants in the semiconductor base regions. In this case, the geometric dimensions of transistors 1. ,, 3, and 11 can be 5-10 times smaller than the dimensions of the main transistors, since the currents flowing through them are much less. The proposed multivibrator is the most promising for use in ultra-large digital integrated circuits made according to planar technology. 1 il. (About ate

Description

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i The invention relates to a pulse technique and can be used as a high-duty pulse generator in micropower digital circuits.

The purpose of the invention is to increase the duty cycle of relaxation oscillations.

The drawing shows an electrical circuit of a multivibrator. The multivibrator contains the first and the micro-power inverters, each of which contains the first lj (where i l for the first inverter and i 2 for the second pp inverter) and the second 2t transistors of the first conductivity type, as well as the third 3j. and the fourth 4t transistors of the second type conduct, and the base of transistor 1 is connected to the first input of the inverter, its emitter is connected to the base of transistor 2, the emitter of which is connected to the common bus 5, and the collector is connected to the first output 6 of the inverter and collector transistor 3, emitter (f transistor 4 is connected to power supply bus 7, its collector is connected to the collector of transistor 1; and the second output 8i of the inverter, and its base is connected to the emitter t of the zz 3, the base of which is the second inverter input , the second time is the output resistor 9 soy Inna with the combined inputs of the first inverter, with the first one, is also connected to the first output time of the driving capacitor 10, the second output of which is connected to the first output of the second inverter 6, and the first output of the resistor Tcipa 9 is connected to the second output 8 the first inverter, the base of the first additional transistor 11 is connected to the second Vj of Sj of the second inverter, its collection Tcjp is connected to the supply bus 7, and the emitter is connected to the base of the second additional transistor 12, the emitter of which is connected to the B bus 5, and the collector under the combined the inputs of the first inverter, all additional transistors of the first conductivity type, the first input of the second inverter is connected to the second output 8 of the first inverter, and the second input of the second inverter is connected to the first output 6 of the first inverter.

Multivibrator works as follows.

Let at the initial moment of time the potential of the base of the previously locked transistor 1 becomes equal to the threshold, then transistors 1 and 2 open, an avalanche-like process occurs, due to which transistors 1 ,, 2d, 3j, 11j and 12 open, and transistors 1, 2 , 3.), 4) are closed. Since the capacitor 10 is charged to a negative voltage equal to the threshold voltage and applied to the base of transistor 1, then at the moment of transfer to another quasistationary state, the base potential of transistor 1 increases abruptly to a level equal to the sum of 5

The SRI of the power source on the bus 7 and the threshold voltage of the transistors 1, and 2 ,.

The high potential of the base of the transistor 11 provides reliable unlocking of the transistor 12, which creates the possibility of fast

the discharge of the capacitor 10 along the following circuit: the power supply area 7, the small values of the base-emitter resistance of the transistor 42 and the collector-emitter of the transistor 3, the capacitor 10, a small internal

0, the collector-emitter resistance of transistor 12 is terminal 5. The discharge of capacitor 10. stops when the potential of the base transistor li decreases to the level of the unlocking threshold.

At the time when the multivibrator circuit is avalanche-shifted to another quasistationary state, transistors 1, 2d and 3, 4 are open, and transistors 1, 2., and 3j, 4 are closed (transistors 11 and 12 are also locked). In this moment

0 time, the capacitor 10 is connected to a positive voltage equal to the threshold voltage of transistors 1 and 2, and applied negatively to the base of transistor 1, thus ensuring its reliable locking.

The process of slow recharging of the capacitor 10 occurs along the circuit: terminal 7 of the power supply — low resistance of the collector-emitter of transistor 4 — time specifying resistor 9 — capacitor 10 0 small resistance of the collector-emitter of transistor 2 — terminal 5 of the power supply.

Perezar capacitor 10 stops when the potential of the base of the transistors 1 .., and 2 rises to the levels of thresholds cpar5 batyvan.

Since the resistance of the resistor 9 can always be chosen significantly greater than the internal resistance of the transistors 12, Зг and the resistance of the base-emit0 ter of the transistor 4, the duty cycle of the relaxation oscillations can reach values of Q 100-1000.

In the switching mode of the logical inverters of the multivibrators, the situation of the passage of the through current through the open transistors 2i and 4 is eliminated, which reduces the power consumption in the switching mode. The inverter control is practically potential, which is ensured by switching on all the main transistors according to the

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Darlington. For the supply voltage V applied to the wiring 5 and 7, one requirement is that it does not exceed the total value of the threshold voltage VT of the transistors of the opposite type of voltage:

(V,) 2 V,

wherein all transistors in the circuit still operate in the exponential part of the I – V characteristic.

The outputs of the inverters, and hence the multivibrator, 8i are provided with currents only in the “Log. 1 through the open transistors 4j, and the outputs 6i are provided with currents only in the state "Log. O through open transistors 2.

The proposed multivibrator is intended for manufacturing using a planar or thin-film semiconductor technology. Topologies for making transistors are combed. The geometrical dimensions of transistors 2, 4, and 12 may be equal to or different at different concentrations of doping impurities in the semiconductor base regions. At the same time, the geometrical dimensions of transistors 1i, 3i, and 11 can be 5–10 times smaller than the dimensions of main transistors, since the currents flowing through them are much smaller.

The proposed multivibrator is most promising for use in ultra-large digital ICs made according to planar technology.

Claims (1)

Invention Formula A multivibrator containing the first and second micropower inverters, the time assigning the resistors and the capacitor, each of the inverters containing the first and second transistors of the first conductivity type, the base of the first transistor being five Q 5 0 five about the first input of the inverter, its emitter is connected to the base of the second transistor, the emitter of which is connected to the common bus, and the collector is connected to the first output of the inverter and the collector of the third transistor of the second conductivity type, the base of which is connected to the second input of the inverter, and the emitter is connected to the base of the fourth transistor of the second conductivity type, the emitter of which is connected to the power bus, and the collector is connected to the second output of the inverter and connected to the collector of the first transistor, characterized in that, in order to increase the well The first and second additional transistors of the first conductivity type are introduced into it, the base of the first additional transistor is connected to the second output of the second micropower inverter, its collector is connected to the power bus, and the emitter is connected to the base of the second additional transistor, the emitter of which is connected to the common bus, and the collector is connected to the connected first and second inputs of the first inverter, to which the first terminals are also connected, the time of the setting resistor and capacitor, W The resistor lead is connected to the second output of the first inverter, and the second capacitor lead is connected to the first output of the second inverter, the first input of the second inverter is connected to the second output of the first inverter, and the second input of the second inverter is connected to the first output of the first inverter.