SU892683A1 - Pulse shaper - Google Patents

Description

() PULSE FORMER

I

The invention relates to a radio metering technique and can be used to generate pulses with a picosecond front and a cut.

The urgency of the problem of forming pulses with a picosecond front (cut) is determined by the need. and such signals to check the transient characteristics of ultra-wideband strobosilloscope, check the performance parameters of the ultra-high-speed IC and other pulsed instruments and devices.

Known driver on the diode with the accumulation of charge SDNZ). With the help of a DNZ it is possible to form pulses with a front of about 100 PS with an amplitude of more than 10 V. In this case, the minimum duration of the front is determined by the diode itself and its characteristics 111.

However, the circuit-technical possibilities of shortening the front for this type of DND are practically absent. For

shortening of the front can be applied to shortening circuits based on an overcompensated rheostatic capacitive divider.

The closest in technical essence to the present invention is a pulse shaper comprising a parallel connected resistor and

10 capacitor.

The transmission coefficient of such a circuit increases with frequency, as a result of which the relative content of high-frequency components in the spectrum of the output signal increases, which in turn leads to a shortening of the front of the output pulse as compared to the input pulse. If an input of such a chain is given a pulse with an exponential front of the form -feigk 1 - ЕЧ

then if the condition ps is fulfilled at the output. an impulse will be received

It has been additionally inserted with a dielectric adjustment screw to change the distance between the capacitor plates.

Sources of information taken into account in the examination

G1

Zhsh / uuh

1, S. Yeremin, et al. Semiconductor diodes with charge accumulation and their application. M., Soviet Radio, 1966.

2.Godenberg L. M, Pulsed

and digital devices. M., Holy Hour, 1973, p. 36-38.

R .

Phie .- /. . ,

Llastin (Aty resistor

FIG.

Claims (2)

Claim 1. A pulse shaper containing a resistor and a capacitor connected in parallel to the gap of the central conductor of the coaxial transmission path, characterized in that, in order to reduce the duration of the front of the generated pulses, the resistor is made in the form of a distributed resistive element connected to the gap by its central contacts the central conductor of the coaxial transmission path, and the housing contacts connected to. an external conductor of the coaxial transmission path, each of two metal plates of a capacitor located one above the other and above the surface of the distributed resistive element, is connected to one of the ends of the central conductor at its junction with the distributed resistive element. 2. A pulse shaper according to n.lj, characterized in that, in order to regulate the shaper transmission coefficient, a dielectric adjustment screw is additionally inserted into it to change the distance between the capacitor plates.