SU430499A1 - TIME DISCRIMINATOR - Google Patents

Description

one

The invention relates to a pulse technique.

A temporal discriminator comprising a differential detector, coincidence circuits, an integrating capacitor H and a voltage follower is known.

In order to increase the sensitivity in the proposed discriminator, the output of the voltage follower is connected via resistors to the differential detector diodes.

The drawing shows the scheme of the proposed temporary discriminator.

The discriminator contains coincidence circuits 1 - 2, a differential detector on diodes 3 V. 4, an integrating capacitor 5, a repeater 6, a voltage, resistors 7–9, capacitors 10–12.

The discriminator works as follows.

The signal, which coincides with the early selector pulse, passes through the coincidence circuit I, is detected by diode 3 and creates on the capacitor 5 an increment of negative voltage voltage (with the polarity of the diodes switching on shown in the drawing). A signal coincident with a late selective pulse passes through a matching circuit 2, detected by diode 4 and creates a positive sign increment in capacitor 5. The resulting increment of stress is

2

the capacitor 5 is equal to the algebraic sum of partial increments and does not depend on the output voltage itself, due to which the transient characteristic of the discriminator turns out to be linear.

Charging current in one arm of the discriminator

y -

s

where E J is the value of the potential barrier

diode;

/ their is the amplitude of the input signal; R 3 is the charge resistance including the output resistance of the coincidence circuit and the direct resistance of the diode; k is the transfer coefficient of the coincidence circuit.

Dead band discriminator.

 BX MV,

very small, since the value of the potential barrier d does not exceed a few tenths of a volt.

The independence of the charge current on the output voltage at the integrating capacitor L / C is ip, i.e. charge capacitance with direct current, determines the linear nature

discriminator transient response

kUoK: r

Ft,

t / c (/) R3-C

Where

t is the duration of the signal at the output of the coincidence circuit;

F is the repetition frequency of the input signal; t-time

The subject of the invention is a time discriminator containing

a differential diode detector whose diodes are connected respectively to the outputs of a coincidence circuit, one of the inputs of which has an input signal, and the second inputs are selector pulses integrating a capacitor and a voltage repeater, characterized in that, in order to increase the sensitivity, the output of the voltage follower connected via resistors to the diodes of the differential detector.

.- --Ty-itisi; -.