SU728160A1 - Optronic shifting register - Google Patents

Description

one

This invention relates to the field of electronics; namely, the design of the optoelectronic shift register used for input. storage and transmission of information.

The Lime Shift Register, each of which is a cell with a bit of two synchronous elements, and the first element of each paS-. An additional expander of AND-OR elements is added in a row. The register has a common zero bus and two buses of shift pulses, one of which receives a direct shift signal, and the other is an inverted 1.

An optoelectronic shift register 2 is also known, each bit whose cell consists of LEDs that are successively turned on; photodiode, photoresistor, and a capacitor connected to this chain.

The disadvantage of the known register is a large number of elements used in one bit cell.

. The aim of the invention is to simplify the optoelectronic shift

register by reducing the number of elements in one bit.

The goal is achieved by the fact that the optoelectronic shift register containing the master LED, the discharge buses and the optically coupled discharge cells connected to them and successively, X1 of which contains the optocoupler

0 a pair of successively connected LEDs and a photodiode connected in opposite directions, the optocoupler pair of the first bit cell being optically coupled to the driver light,

5, a second optocoupler pair of LEDs and a photodiode connected in series and counter-switched on is inserted into each bit, with the first and second optocouples of each bit switched on opposite to each other and optically interconnected.

Figure 1 shows a diagram of an optoelectronic register; figure 2 shows the time chart of the clock

5 meander, optical pulses of LEDs and conductivity of photodiodes.

Optrons 2,3,4 connected optically connected to each other are connected to the clock tires 1

0

serial optical flux so that the optical flux of the optocoupler pair (rptron) 2 is connected with the photodiode of the optocoupler 3, etc. The photodiode of the optocoupler 2 is optically coupled to the driving LED 5. It can be connected to a clock bus for synchronous start,

The operation of the optoelectronic shift register is as follows

At time i (Fig. 2), a triggering pulse is applied to the driver LED 5, it is excited and emits the optical flow of Fig. 2 b), irradiating the photodiode of the optocoupler 2 (Fig. 2c), which tracks changes in the light flux of the LED 5, and at t, when the polarity of the clock meander (Fig. 2 changes on Shia 1 to the opposite one, corresponding to the polarity of the LED of the optocoupler 2, the LED of this optocoupler starts to be excited, and the LED 5 exponentially decreases the intensity of the radiation and, taking into account that the photodiode optocoupler 2 produces .summation of two op It remains in the excited state and at the moment of tj-t, continuing to monitor the fluxes of two light diodes.If we consider that, for example, arsenic-gallium epitaxial LEDs AL103A, B have a rise time of an emission pulse of 200-300 not, and the decay time 500 not radiation, or the phosphidogallium mesadiffusion AL106A, B, C LEDs have a pulse front length from Uroyn 0.1 to 0.9: front equals 10, rear - 20 NS, then without taking into account the inertia of the photodiode two optical fluxes of two LEDs overlap that svid Indicates the continuity of excitation of the photodiode. Considering the inertia of the photodiode, for example, the photodiode ad-1, is constant: - whose time is 10 s,

On the transition, the conductivity of the photodiode remains almost unchanged, indicating that switching is reliable. At time, the optocoupler diode 2 has maximum conductivity.

Simultaneously with the excitation of the photodiode of its optocoupler, the LED of the optocoupler 2 excites the photodiode of the optocoupler 3, which in the time period t ,, does not excite the diode of its discharge, since the polarity of the clock square wave does not correspond to the field of the LED. state (FIG. 2 d), and, as soon as at time t Q, the polarity of the clock square wave changes. c to the opposite, immediately light-emitting diode (Fig. 2 e) of the optocoupler 3, maintaining the photodiode of its optocoupler (Fig. 2 d) in the excited state and at the same time exciting the photodiode of the optocoupler 4 (Fig. 2 g), etc.

In this optoelectronic shift register, as compared with the known, the number of elements of the discharge cell is reduced.

Claims (2)

Invention Formula Optoelectronic shift register containing a master LED, bit buses and connected to them and in series optically coupled zero bit cells, each of which contains the first optocoupler pair of series-connected LEDs and a photodiode, connected in opposite to each other, the optocoupler pair of the first bit cell being optically coupled to the master LED, which is characterized by the fact that, in order to simplify the register, a second pair of optocoupler connected in series and counter-lit LED and (photodiode, and the first and second The optocouplers of each bit are intertwined with each other and are optically interconnected. Sources of information taken into account in the examination  Bukreev I.N. and others. Microelectronic circuits of digital devices, M., Sov.radio, 1975, p. 129-159. 2. Electronics, 1967, 25, p.28 (prototype). : - b. J .