SU491198A1 - Pulse generator - Google Patents

Description

The invention relates to impuls and computer technology, can be used as a driving low frequency generator with stable time parameters nln for linear conversion of the voltage into a pulse frequency.

A pulse generator is known that contains a series-connected trigger, a timing driver circuit of a capacitor and two time-dependent resistors and a regenerative circuit: fator.

The goal of nzobrestepl is to increase the frequency stability of the pulses.

The proposed generator differs in that it contains two keys, two dvuhvhodov; x voltage suppressor on the MOS transients, current reiepaTop and zener diode, npii4CM both inputs of the first voltage repeater are connected to the plates; time for; yes1С) н :, capacitor, the repeater output is connected with one input of a voltage comparator and the anodome of a zener diode whose cathode is connected to the connection point:: ;;; 1 Brem set; 1 ;; nx of resistors and current generator, one input of the second duplicator , another connected with onorny source voltage, and the output is connected to the drubiy input of the regenerative co-parator. The voltage whose output is connected to the fibiM account of the trigger input, the trigger outputs are connected to the gate of the MOSFET transistor, the drains of which are connected to the windings of the time of the master capacitor, and the sources to the common source iitann.

(The principle of the pulse generator is shown in the drawing.

Trigger 1 is assembled according to a symmetric scheme on saturating transistors, to whose collectors the gates of field MO.P-transistors 2 and 3 are connected, which play the role of keys, with which the time of the driving capacitor 4 reverses. The sources of 2 m 3 transistors are connected to a common power supply terminal and drains - to the points of connection of the capacitor plates, the inputs of the two-input repeater and formula 5 and the time of the setting resistors 6 and 7 connected to the current generator 8. The output of the repeater is voltage 5 connected to the anode of the stabilizer 9, the cathode is wired plug to the connection point of 6 m 7 resistor with generators; a current of 5 ns by a signal input of a reverheperative nanowhatny comparator 10, the reference input of which is connected to the output of the second two-input voltage follower //, whose input and the other are connected to the source of the reference nanometer 12. The output to:,; natorto 10 is connected to the counting trigger input /.

The scheme works as follows.

. After powering on, one of the trigger trays / saturates, the other is cut off. Transistors 9 and 5, depending on the gate potentials, are also in the saturation and cutoff state. Suppose that the transistor 2 is full. Then the time of the driving capacitor 4 begins to charge with a constant current of the current generator 8 through the resistor 7. The voltage at the output of the double-output voltage repeater 5 repeats the voltage on the capacitor plates n increases linearly, because with the help of a stabilizer 9 switched on the value of positive feedback, there is an additional linearization of the charge of the capacitor. When the voltage at the outputs of the two-input repeaters 5 and // becomes the same, a positive feedback starts to act in the comparator circuit, as a result of which the regenerative process develops, and a positive polarity pulse appears on the output. Having arrived at the counting input of trigger I, this pulse switches it to another stable equilibrium state. Transistor 2 closes and transistor 3 opens. In this case, the papping of the output of the second switch of the transistor 3 becomes equal to zero, and the output voltage of the first switch of the transistor 2 jumps to - (/ o (reference).

Since the difference in voltage at the outputs of the repeaters 5 and / V increased, in the comparator circuit the feedback is again negative. The capacitor starts recharging to + /: jiiiT. As soon as the voltage output of the repeater 5 becomes equal to the voltage at the output of the repeater 11, the positive feedback again acts. Further, the processes are repeated.

Since the relaxation process is unresolved, the impulses become longer, and their frequency becomes more stable.

Thus, a multiple of the device has a shunt effect on the time of the driving circuit (the input resistance of the voltage repeater when using zero-MOS transistors is 1000 Mohms more), the stability of the time parameters

with geyirovani in the low-frequency region of the substance increases. The time setting kopd, the encapsulator is recharged according to the linear law, therefore, the device can be linearly modulated by oscillating by changing the value of the voltage. The field MOS traisistors used as reversing keys turn on and off almost 1 mg of the bridge, and therefore the linear sawtooth is developed with a "zero" in reverse.

Claims (1)

Invention Formula Pulse generator, containing in series thrnger, time master circuit consisting of a capacitor and two drive resistor time, and regenerative Comparator of nanning, differing in m, that, in order to improve the frequency of the generated frequency of the generated pulses, two keys, two two-input repeaters for the MOSFET, a current generator and a stabilizer are added to it, and both inputs of the first repeater are connected to the time plates of the setting capacitor, output a repeater is connected to one input of a regenerative voltage supply and an anodo-M of a zener diode, the cathode of which is connected to the connection point of the time of the driving resistors and the current generator, one input of the second repeater ground, another Oediii with a source of onorio | -o voltage, and the output is connected to another input of the regenerative comiarator and an oscillator, the output of which is connected to the counting input of the trigger, the outputs of the trigger are connected to the gates and the MOP transistors, the drains of which are connected to the terminals of the trigger; , and the origins - to the common cheek power source. 0 +