SU362438A1 - ALL-UNION JP-vg- •! ~! Jf "" '•' 'm "f:," "g" • andSft ^ AlttiiSib-iLAiiirii: HAj?) - Google Patents

Description

one

The invention relates to the field of radio engineering and can be used in measuring and computing, in radar and television.

Known waiting pulse generators of a triangular shape, containing a symmetric trigger on transistors, an integrator on a transistor amplifier with a variable time specifying resistance, and a threshold device on a Zener diode.

The described generator is characterized in that the variable time specifying the resistance is connected between the integrator input and the trigger output, while the integrator output is connected via a zener diode of the threshold device with one trigger input.

This improves the symmetry and increases the linearity of the fronts of the output pulse, and also simplifies the circuit for adjusting the pulse duration.

FIG. 1 is a schematic diagram of a triangular-shaped standby pulse generator performed on transistors; in fig. 2 - time diagrams of voltages at control points.

The waiting triangular pulse generator includes a trigger /, integrator 2 and threshold device 3.

In the initial position, the trigger / is in the zero state, integrating the capacitor 4 is discharged to the initial voltage, approximately equal to the residual voltage UOCT., Determined by the key properties of the active element of the integrator 2, which is in the open (saturated) state. When the input trigger pulse (see Fig. 2, pos. A) arrives, the trigger / is thrown into the "one state." At the output of the trigger / a potential is formed, which causes the charge of the capacitor 4; formation of the leading edge of the pulse begins. Due to the linearizing effect of negative feedback in integrator 2, the generated voltage has high linearity, and the linearity is the higher, the greater the gain of integrator 2. When the output voltage is t / nop. reaches the triggering level of the threshold device 5, the latter trips the trigger / to the initial state, and at its output a voltage level of opposite sign is formed, which in absolute value is equal to the trigger voltage level 1 during the formation of the leading edge (see Fig. 2, pos. b). From this moment on, the discharge of the integrating capacitor 4 begins, which ends when the voltage across the capacitor reaches the value t / ost. Since the values of positive and negative differences are the same, the charge and discharge of the integrating capacitor 4 occurs through the same resistor 5, the voltage. and t / nop. are fixed, the generator generates a symmetrical triangular pulse, smoothly adjusting the duration of which can be performed by changing the resistance value of the resistor 5 or the capacitance value of the capacitor 4 while maintaining the symmetry of the pulse shape and its amplitude.

Subject invention

A waiting triangular pulse generator containing a symmetric trigger on

transistors, a variable time impedance integrator and a threshold device on the Zener diode, characterized in that, in order to improve symmetry and increase the linearity of the fronts of the output pulse and simplify the impulse control circuit, the variable time impedance is connected between the integrator input and the trigger output , the output of the integrator is connected via a Zener diode of the threshold device with one of the trigger inputs. Rig J