SU1264304A1 - Line for delaying pulse electric signal - Google Patents

Abstract

The invention relates to electronics and can be used in small-sized electronics. The aim of the invention is to increase the delay time. To achieve this goal, the device additionally includes: a second ultrasonic delay line 2, a key element 3, an amplitude discriminator 4, a separation capacitor 5 and an emitter follower 6. The device also contains piezoelectric plates 7 and 8, input 9-12 and output S 13-16 electrodes. If. Pye oelectric (L

Description

The plates 7 and 8 are made of a delay and can be used for a single material, so that their lengths should be delayed electrically related as odd numbers. Line signals. 1 il.

1264304

The invention relates to radio engineering and electronics, can be used in small-sized electronic equipment and is intended for the time delay of electrical signals of pulsed

The aim of the invention is to increase the delay time.

The drawing shows the electrical circuit of the delay line.

The device contains ultrasound lines 1 and 2 of delay, key element 3, amplitude detector 4, separation capacitor 5, emitter follower 6. Ultrasonic delay lines contain piezoelectric plates 7 and 8. If they are made of the same material, their lengths should be treated as odd numbers On each of the plates made input 9-12, output 13-16 electrodes. The electrodes of the input sections 9 and II are connected and connected to the input of the entire delay line. The electrode of the output section of the piezoelectric element 7 is connected to the key element 3 via serially connected emitter repeater 6 and separation capacitor 5. The electrode of the output section of the ultrasonic line 2 is connected to the control input of the key element 3 through the amplitude detector 4. The output of the key element 3 is the output of the device.

The device works as follows.

The input pulse signal arriving at the electrodes 7, 10 and 11, 12, due to the inverse piezoelectric effect, causes elastic waves in the piezoelectric elements. Moving with the speed of sound in the piezo material and repeatedly reflecting from the edges of the piezoelectric elements 1, 2, the elastic deformation waves after some time (if the lengths of

The waters are referred to as odd numbers) reached the output electrodes I3 and 14 and 15 and 16 at the same time. On electrodes 13, 14 and 15, 16 due to

electrical signals are produced directly by the piezoelectric effect. The signal taken from the electrode 13 relative to the electrode 14 is fed to the emitter follower 6, amplified and fed to

the input of the key element 3 is converted by the amplitude detector 4 into a pulse of positive polarity, which is supplied to the key element 3, allowing the signal to be removed

from the output of the emitter follower 6, to reach the output of the entire device

If their delay lines are made of materials with identical sound speeds (V), then the following is true:

+ 1

kL tt

where ha, n

-whole numbers;

L ,, L,

- lengths of electroacoustic paths, respectively, ultrasonic delay lines 1 and 2.

Minimum delays of delay lines can be phased in through the speed of sound in the piezo:

t. f 1

1 T v 2. V iB 3

For definiteness, we consider T ,. The result is

T {2, + 1); T () T,

where T is the minimum delay time

Claims (1)

the entire device. Thus, the minimum delay time of the entire device is () times longer than the delay time provided by the ultrasonic delay line 1 (it has a delay time T longer than the delay line 2). The invention of the delay line of a pulsed electrical signal containing an ultrasonic delay line connected by an input to an input bus, is so that, in order to increase the delay time, a second ultrasonic delay line is introduced into it, a key element amplitude 04.44 discriminator, separation capacitor and emitter follower, the output of the first ultrasonic delay line through the emitter follower and separation capacitor is connected to the signal input of the key element, whose input through the amplitude detector is the second ultrasonic delay line connected to the input bus, the output of the key element is the output, the delay delays, and the lengths of the electroacoustic paths of the ultrasonic lines are referred to as odd numbers.