SU465720A1 - Odnovibrator - Google Patents

Description

is closed. The transistor 5 is also closed and is in a cut-off state. A negative synchronization pulse arrives at the base of the transistor 9, transferring it to the saturation state. The capacitor 8 starts charging up to the voltage of the power source E. The charging current flows through the circuit: "Earth - saturated transistor 9 - capacitor 8 - resistor 7. Thus, the metered charge of the carriers goes to the collector of transistor 5, the value of which is determined only by the voltage value of the power source and the capacitance value of the capacitor 8. Each synchronization pulse lowers the potential of the cathode of diode 2 (the right side of the capacitor 4) by a strictly fixed value - "step" (see Fig. 2, stress diagram t / o). The step amplitude is determined by the pulse current area of the collector of transistor 5, the dth pulse opens diode 2 and transistor 1. In the circuit, a regenerative process occurs, as a result of which transistor 3 closes, goes into a cut-off state, and transistor 1 becomes saturated with a capacitor charge current 4. The charge time of the capacitor 4 is determined by the recovery time of the circuit. After the initial voltage is restored on the storage capacitor 4, a reverse regenerative process occurs in the circuit, as a result of which the circuit returns to its original state. FIG. Figure 2 shows a voltage plot in the collector circuit of transistor 1 (t / o), illustrating the process of frequency division.

When the voltage of the power source changes, the value of the initial voltage changes by the time of the reference capacitor 4 and, proportional to this change, is the amplitude of the step. Since the process of reducing the voltage on the capacitor 4 is rechargeable, the division ratio n does not depend on the voltage of the power source and, for R, is determined by the relation:

P

but,

where a is the current transfer ratio of the emitter of the transistor 5;

C4 and Ce capacitors 4 and 8 of the one-shot, respectively. Thus, the division factor n does not depend on the amplitude of the impulses supplied, the threshold voltage of the switch and the voltage of the power source, which significantly increases the stability of the division rate of the pulse repetition signals.

Subject invention

A single vibrator on transistors of the same type of conductivity with a collector base connection and a thermal stabilizing diode connected between one of the plates of the time of the driving capacitor and the base closed in

the initial state of the transistor, characterized in that, in order to ensure the possibility of dividing the frequency of non-periodic pulsed signals and increase the stability of the division factor, the key is entered into it

on the transistor of the same conductivity type, assembled according to the OE scheme, the base of which is connected to the source of synchronizing pulses, and the pulse current generator on the transistor of the opposite conductivity type, the collector of which is connected to the common point between the driving time capacitor and the indicated diode, through the resistor power supply bus, base through a resistor with the same power supply bus

and through a capacitor with a collector transistor switch.

S-e

n pulses

2