JPS5821234Y2 - Tongue anti-multi vibrator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a monostable multi-bi-break, and in particular, even when it is integrated into an integrated circuit, it is stabilized by reducing external parts, and the circuit configuration is simplified.

Hereinafter, an embodiment of the monostable multivibrator according to the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 indicates a switching element such as an npn transistor, and the base of this transistor 1 is connected to an input terminal 2 with a trigger having a voltage higher than the threshold voltage of this transistor 1 as shown in FIG. 2A. A pulse signal is supplied, and when this trigger pulse signal is supplied to the base, this transistor 1 is turned on.

The collector of this transistor 1 is connected to one end of a resistor 3, the emitter of this transistor 1 is grounded, the other end of the resistor 3 is connected to the cathode of a diode 4, and the anode of this diode 4 is connected to a resistor 5. It is connected to one end of the capacitor 6 and also to one end of the capacitor 6.

The other end of the resistor 5 is connected to a power supply terminal 7 that supplies a positive voltage, and the other end of the capacitor 6 is grounded.

In this case, the capacitor 6 is externally connected, and the resistor 3 and this capacitor 6 constitute a time constant circuit, and the resistor 5 and this capacitor 6 constitute a time constant circuit, and here the resistance value of the resistor 3 is set to the value of the resistor 5. Select a value sufficiently smaller than the resistance value.

That is, the time constant of the time constant circuit composed of resistor 3 and capacitor 6 is set to be sufficiently smaller than the time constant of the time constant circuit composed of resistor 5 and capacitor 6.

Further, the resistance value of the resistor 5 is selected depending on the time constant for obtaining and removing the resistor, that is, the pulse width to be obtained.

Furthermore, the anode of the diode 4 is connected to an npn transistor 9.
The collector of this transistor 9 is connected to the base of an N-type transistor 10 and is also connected to the power supply terminal 7 via a resistor 11.

The collector of transistor 10 is connected to power supply terminal 7, and the base of transistor 10 is grounded via resistor 12.

Further, the emitters of the transistors 9 and 10 are connected to each other, and this connection point is connected to a resistor 13 constituting a constant current circuit.
Ground through.

Second class transistors 9 and 10 form a Schmitt circuit 8, so that when transistor 9 is on, transistor 1
0 is off, and when transistor 9 is off, transistor 10 is on.

On the other hand, the base of transistor 10 is connected to the base of npn type transistor 14, and the collector of this transistor 14 is connected to power supply terminal 7.

The emitter of this transistor 14 is connected to the other end of the resistor 3 and also to the cathode of the diode 4.

Further, the output terminal 15 of this monostable multivibrator is led out from the collector of the transistor 9, for example.

An embodiment of the monostable multi-bibreak according to the present invention is constructed as described above, so that when a pulse signal as shown in FIG. 2A is supplied to the base of transistor 1 from input terminal 2, this transistor 1 The base voltage becomes higher than the threshold voltage, and this transistor 1 is turned on. Therefore, the potential on the cathode side of the diode 4 becomes lower than the potential on the anode side, and this diode 4 becomes forward biased. Turns on.

Therefore, the capacitor 6 is discharged through the series circuit of the diode 4, the resistor 3, and the transistor 1, and in this case, due to the time constant of the time constant circuit of the resistor 3 and the capacitor 6, the capacitor 6 is relatively short. Since the capacitor 6 is discharged over time, the voltage across the capacitor 6 falls as shown by curve a in FIG. 2B.

At this time, the transistor 9 constituting the Schmitt circuit 8
Since the base voltage of the transistor 10 also decreases, this transistor 9 is turned off, and the voltage drop across the terminals of the resistor 11 decreases, so the base voltage of the transistor 10 increases and becomes as shown in FIG.
, and this transistor 10 is turned on.

In this case, since the resistance value of the resistor 3 is selected to be sufficiently small as described above, the time constant of the time constant circuit of the resistor 3 and the capacitor 6 is approximately determined by the capacitance value of the external capacitor 6. Therefore, the rise of the base voltage of the transistor 10 is stabilized.

Next, the capacitor 6 is charged by the power supply terminal 7 via the resistor 5, and in this case, the capacitor 6 is charged in a relatively long time due to the time constant of the time constant circuit of the resistor 5 and the capacitor 6. , the voltage across this capacitor 6 rises as shown by curve C in FIG. 2B.

At this time, the base voltage of transistor 9 also increases, so
This transistor 9 is turned on, and the voltage drop across the terminals of the resistor 11 increases, so that the base voltage of the transistor 10 decreases to point d in FIG. 2C, and this transistor 10 is turned off.

After this, the capacitor 6 remains charged, and the voltage across the capacitor 6 becomes as shown by the curve e in FIG. 2B.

However, the voltage difference f that occurs between the voltages across the capacitor 6 at the time of transition from the charged state to the stable state is determined by the resistance ratio of the resistors forming the Schmitt circuit 8.

After this, when a pulse signal as shown in FIG. 2A is further supplied from the base input terminal 2 of the transistor 1, the transistor 1 is turned on and the capacitor 6 is discharged. Multi-bye break repeats the operation described above.

As a result, an output signal such as that shown in FIG. 2C, which is the base voltage of the transistor 10, can be obtained at the output terminal 15.

Moreover, since the pulse width of this output signal is not affected by the pulse width of the pulse signal supplied to the input terminal 2, it is stable.

Furthermore, the voltage across both terminals of the capacitor 6 is not affected by the pulse width of the pulse signal supplied to the input terminal 2, as shown in FIG. 2B.

As described above, the monostable multi-bibreak according to the present invention requires only the capacitor 6 as an external component even when it is integrated into an integrated circuit, and is therefore stable against temperature and variations.

Further, since it can be constructed from switching elements such as the transistor 1, a time constant circuit, a Schmitt circuit 8, etc., the circuit construction is simple.

Furthermore, since it is not a saturation type but a current switching type, it has the advantage that it can be used up to high frequencies.

Further, in this example, the output terminal 15 is led out from the collector of the transistor 9, and an output signal as shown in FIG. 2C is obtained at this output terminal 15. It is also possible to derive this output terminal 15 from a predetermined location in order to obtain the following.

Further, in this example, the other end of the capacitor 6 is grounded, but even if the other end of the capacitor 6 is connected to the power supply terminal 7, the charging and discharging operations will only be reversed. It is easy to understand that there are effects similar to those described above.

Further, FIG. 3 shows another embodiment of the monostable multivibrator according to the present invention. In FIG. 3, parts corresponding to those in FIG. 1 are given the same reference numerals, and detailed explanation will be omitted.

In FIG. 3, a transistor 14 and an npn transistor 16 constitute a differential amplifier 17, and the emitters of the transistors 14 and 16 are connected to each other, and this connection point is connected to a resistor 3 and a diode 4. Connect to the midpoint of the connection.

Further, the base of the transistor 16 is connected to the power supply terminal 7 through the resistor 5, and the collector of this transistor 16 is connected to the power supply terminal 7 through the resistor 18, so that the output terminal 19 is derived from the collector of the transistor 16. do.

On the other hand, a differential amplifier 22 is configured by an npn transistor 20 and an npn transistor 21, and the emitters of the transistors 20 and 21 are connected to each other, and this connection point is connected to one end of a resistor 23. with diode 2
The other end of this resistor 23 is grounded, and the anode of this diode 24 is connected to the midpoint between the resistor 5 and the capacitor 6.

In this case, the resistor 23 and the capacitor 6 constitute a time constant circuit, and the resistance value of the resistor 23 is selected to be sufficiently smaller than the resistance value of the resistor 5.

That is, the time constant of the time constant circuit made up of resistor 23 and capacitor 6 is set to be sufficiently smaller than the time constant of the time constant circuit made up of resistor 5 and capacitor 6.

Further, the base of the transistor 20 is connected to the power supply terminal 7 through the resistor 5, the collector of this transistor 20 is connected to the power supply terminal 7 through the resistor 25, and the output terminal 26 is derived from the collector of this transistor 20. do.

Further, the collector of the transistor 21 is connected to the power supply terminal 7, and the base of the transistor 21 is connected to the midpoint between the resistors 27 and 23.

Also, the base of the transistor 10 is connected to the resistors 27 and 2.
It is connected to the connection midpoint between the collector of the transistor 9 and the resistor 11 through a series circuit of 8.

The rest of the structure is the same as in FIG.

Another embodiment of the monostable multi-bibreak according to the present invention is constructed as described above, so that when a pulse signal as shown in FIG. 4A is supplied to the base of the transistor 1 from the input terminal 2, the transistor 1 The base voltage of becomes higher than the threshold voltage, and this transistor 1 is turned on.

Therefore, as mentioned above, the capacitor 6 is discharged according to the time constant of the time constant circuit of the resistor 3 and the capacitor 6, and the voltage across the capacitor 6 falls as shown by the curve a in FIG. The base voltage also increases as described above and rises to point b in FIG. 4C.

Further, when the transistor 1 is turned on, one of the transistors 14 and 16 constituting the differential amplifier 17, that is, the transistor 16 having a high base voltage is turned on, and the transistor 1 is turned on.
A current flows through the collector of resistor 18, and a voltage difference g occurs between both ends of resistor 18 as shown in the fourth diagram.
The voltage across the resistor 18 decreases as the base voltage of the transistor 16 decreases, that is, the voltage across the capacitor 6 as shown in curve a of FIG. It becomes like ri.

Therefore, when a pulse signal as shown in FIG. 4A is supplied to the base of the transistor 1, a differential pulse signal as shown in FIG. 4 can be obtained at the output terminal 19.

Next, the capacitor 6 is charged by the power supply terminal 7 via the resistor 5 as described above, and the voltage across the capacitor 6 rises as shown by the curve C in FIG. 2B.

At this time, the base voltage of transistor 9 also increases, so
As described above, the base voltage of transistor 10 decreases to point d in FIG. 4C, and transistor 10 is turned off.

After this, the capacitor 6 is discharged through the series circuit of the diode 24 and the resistor 23, and in this case, due to the time constant of the time constant circuit of the capacitor 6 and the resistor 23, the capacitor 6 is discharged in a relatively short time. Therefore, the voltage across the capacitor 6 falls as shown by curve i in FIG. 4B.

However, the voltage difference f that occurs between the voltages across the capacitor 6 at this time is determined by the resistance ratio of the resistors forming the Schmitt circuit 8.

Further, when the capacitor 6 is charged as shown by the curve C in FIG. 4B, the base voltage of the transistor 20 forming the differential amplifier 22 also becomes high, and this transistor 20 is turned on.
A current flows through the collector of the transistor 20, and a voltage difference j occurs between both ends of the resistor 25 as shown in FIG. Since the voltage decreases as the voltage across the capacitor 6 decreases as shown by the curve i in FIG. 4B, the change in the voltage across the resistor 25 becomes as shown in the curve in FIG. 4E.

Therefore, when the capacitor 6 is charged as shown by the curve C in FIG. 4B, a differential pulse signal as shown in FIG. 4E can be obtained at the output terminal 26.

Also, the delay time of the differential pulse signal obtained at the output terminal 26, that is, the delay time when the differential pulse signal obtained at the output terminal 19 is taken as a reference, is determined by the time constant of the time constant circuit of the resistor 5 and the capacitor 6, and the Schmitt time constant. It is determined by the resistance ratio of the resistors constituting the circuit 8, and therefore this delay time is stable.

After this, the capacitor 6 remains charged, and the voltage across the capacitor 6 becomes as shown by the curve e in FIG. 4B.

Furthermore, a second terminal is connected to the base of the transistor 1 from the input terminal 2.
When a pulse signal as shown in FIG.

As a result, a differential pulse signal as shown in Figure 4 can be obtained at the output terminal 19, and a stably delayed differential pulse signal as shown in Figure 4E can be obtained at the output terminal 26.

Furthermore, FIG. 5 shows another embodiment of the monostable multivibrator according to the present invention, and in FIG. 5, parts corresponding to those in FIGS. is omitted.

In this FIG. 5, the transistor 14 and n
A differential amplifier 17 is configured with a pn type transistor 16,
The emitters of the second transistors 14 and 16 are connected to each other, and this connection point is connected to the midpoint between the resistor 3 and the diode 4.

Further, the base of the transistor 16 is connected to the power supply terminal 7 through the resistor 5, the collector of this transistor 16 is connected to the power supply terminal 7 through the resistor 18, and the output terminal 19 is derived from the collector of this transistor 16. do.

On the other hand, the midpoint between the resistor 5 and the capacitor 6 is connected to the base of the npn transistor 20, the emitter of this transistor 20 is connected to the base of the transistor 9, and the connection point between the resistor 5 and the capacitor 6 is connected to one end of the capacitor 6 via the resistor 29. Connecting.

In this case, the resistor 29 and the capacitor 6 constitute a time constant circuit, and the resistance value of the resistor 29 is selected to be sufficiently smaller than the resistance value of the resistor 5.

That is, the time constant of the time constant circuit made up of resistor 29 and capacitor 6 is set to be sufficiently smaller than the time constant of the time constant circuit made up of resistor 5 and capacitor 6.

Further, the collector of the transistor 20 is connected to the power supply terminal 7 via a resistor 25, and an output terminal 26 is led out from the collector of the transistor 20.

The rest of the structure is the same as in FIG.

Another embodiment of the monostable multi-bi break according to the present invention is constructed as described above, so that when a pulse signal as shown in FIG. 4A is supplied to the base of the transistor 1 from the input terminal 2, as shown in FIG. As in the example, the transistor 1, the differential amplifier 17, etc. operate, and the voltage across the capacitor 6 becomes the fourth voltage.
The curves change as shown by curves a and C in Figure B, and a differential pulse signal as shown in the fourth diagram can be obtained at the output terminal 19.

The capacitor 6 is then discharged through a series circuit of a resistor 29 and a transistor 9 which is turned on when the capacitor 6 is charged, and in this case due to the time constant of the time constant circuit of the capacitor 6 and the resistor 29. Since this capacitor 6 is discharged in a relatively short time as in the example shown in FIG. 3, the voltage across this capacitor 6 falls as shown by the curve i in FIG. 4B.

Furthermore, when the capacitor 6 is charged as shown by curve C in FIG. A voltage difference j occurs between both terminals as shown in FIG.
Since the voltage decreases as the voltage across the capacitor 6 decreases as shown by the curve i in FIG. 4, the change in the voltage across the resistor 25 becomes as shown in the curve in FIG. 4E.

Therefore, when the capacitor 6 is charged as shown by the curve C in FIG. 4B, a differential pulse signal as shown in FIG. 4E can be obtained at the output terminal 26, similar to the example in FIG. 3.

That is, in the example of FIG. 5, when a pulse signal as shown in FIG. 2A is supplied to the base of the transistor 1 from the input terminal 2, the output terminal 19 as shown in FIG. A differential pulse signal as shown in FIG. 4 can be obtained at the output terminal 26, and a stably delayed differential pulse signal as shown in FIG. 4E can be obtained at the output terminal 26.

Note that the present invention is not limited to the above-described embodiments, and various other configurations may be adopted without departing from the spirit of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a connection diagram showing an embodiment of the monostable multi-bi break of the present invention, Fig. 2 is a diagram for explaining the present invention, and Fig. 3
5 and 5 are connection diagrams showing other embodiments of the present invention, respectively,
FIG. 4 is a diagram for explaining another embodiment of the present invention. 1.9, 10 and 14 are transistors, 2 is an input terminal, 3, 5, 11. 12 and 13 are resistors, 4 is a diode, 6 is a capacitor, 7 is a power supply terminal, 8 is a Schmitt circuit, 15 is a It is an output terminal.

Claims (1)

[Scope of utility model registration request] connecting a collector of a first transistor to a first terminal of a power source, and connecting a series circuit of a resistor and a diode between the first terminal of the power source and the emitter of the transistor;
A capacitor is connected between the connection point of the resistor and the diode and a second terminal of the power source or the first terminal, and a capacitor is connected between the emitter of the first transistor and the second terminal of the power source.
A charging or discharging circuit controlled by the IJ Gar pulse (input between the input terminal and the input terminal) is provided, and the charging or discharging circuit is provided between a second transistor and a third transistor, and a feedback circuit is provided between the base of the second transistor and the collector of the third transistor. a Schmitt circuit having a circuit, the base of the first transistor being connected to the base of the second transistor, and the connection point between the diode and the capacitor being connected to the base of a third transistor constituting the Schmitt circuit; A monostable multi-bi break characterized by a connection.