SU760189A1 - Optronic shifting register - Google Patents

Description

The invention relates to optoelectronics, in particular to the design of an optoelectronic shift register used for input, storage and transmission of information. five

A shift register is known, each digit of which consists of two synchronous elements, and an additional expander of 10-AND elements is added to the first element of each digit. The register has a common zero-setting bus and two shift-pulse buses, one of which receives a direct shift signal, and the other is an inverted one [1]. 15

Also known is an optoelectronic shift register, each digit of which consists of a series-connected LED, photodiode and photoreistor, as well as a connected 20 parallel to the photodiode and a capacitor LED [2 ^.

The disadvantage of the known device is the limited speed, and when using the clock 25 square wave to power the device and shift information, the disadvantage with increased speed (the maximum speed with which the optron pair is triggered) is increased 30

requirements on the clock square fronts.

The purpose of the invention is to increase reliability while reducing the requirement for squareness of the clock square wave, for example, instead of a clock square wave, use a sinusoidal signal.

This goal is achieved by the fact that the optoelectronic shift register, which contains the master LED, bit buses and optically connected discharge cells connected to them, each of which contains a storage capacitor, and an optocoupler pair of series-connected photodiode and a light-emitting diode, connected opposite to each other, A valve and a limiting resistor are inserted into each discharge. In this case, the limiting resistor is connected successively to the LED, and parallel to them is the storage capacitor. The valve is connected in series and counter with the photodiode.

FIG. 1 is a schematic diagram of an optoelectronic register; in fig. 2 - time diagrams of electrical and optical signals.

The optoelectronic shift register consists of a master LED 1,

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and series-connected optical flow of discharges made of photodiode 2 with counter-connected valve 3, they are connected in series to storage capacitor 4, LED 5 with additional limiting resistor 6. The second discharge is similar, except for the polarity of turning on photodiode 7, to which the storage capacitance is connected 8 and an oppositely connected light {d diode 9. The discharges are connected via the limiting resistor 10 to the clock bus, to which the clock square is supplied. . ·

The operation of the optoelectronic register is as follows. ί

When a signal is sent to the Master LED 1, which can be connected to one of the clock buses for synchronization, a luminous flux (b) appears at its output. 20

When ι _{1 the} luminous flux of the LED ₁ increases and remains constant up to 1 _g . When changing the polarity of the meander and the luminous flux decreases. By tracking this optical flow photodiode 2 25

It increases its conductivity in, but the polarity of the contact-a-meander is not favorable for the first discharge (the polarity of the LED 4 and the valve 3 is opposite to the polarity of the clock β м squarer, the valve eliminates the charge of the storage capacitor 4, and the thermal capacitance 8 is not charged, because the photodiode 7 is not excited).

When there is a change in the Polarity of the clock meMdra and from 1 ₂ , the charge g of the accumulative capacitance 4 occurs, and the optical flux of the LED 16 begins to decrease and at the same time the optical flux of the LED 5 increases, 40

which maintains in the excited state photodiode 2 and 7, the conductivity of which in and e varies in accordance with the optical flux d of the LED 5. 45

When C increases the optical flux of the LED 5 and practically remains

"" "1 ¥ ёстОТОйай / 8ё 'ί д-," ’пЖ''e ί oi" yOrmyMoyo on storage tank 4 is also constant.

When e _e there is a change in the polarity of the clock meander a, the valve 3 is locked and the storage capacitor 4 through an additional limiting resistor 6 and the LED 5 is discharged.

In this case, the decay time of the optical flux of the LED 5 should not exceed half the clock period. The photodiode 7 e monitors the optical flux of the LED 5, and the storage capacitor 8 charges from 1d to, and from ₇ it increases the optical flux from LED 9,

When c accumulative capacitance 4 is discharged, and c decreases to the optical flux d of LED 5.

When Tso there is a change in the polarity of the clock meander, and the next discharge is excited, etc.

Turning on the valve and the cumulative capacitance with an additional limiting resistor and a register bit allows to increase the reliability of the register while reducing the requirements on the clock edge fronts, and it is possible to shift with a sinusoidal signal, which excludes devices forming a clock signal. meander.

The use of the invention will improve the reliability of the optoelectronic register and expand the scope of use.

Claims (1)

Claim An optoelectronic shift register containing a master LED, bit buses and optically connected discharge cells connected to them and serially connected, each of which contains a storage capacitor and an optocoupler pair of successively connected photodiodes and an LED connected oppositely to each other, In order to improve the reliability of the register, a valve and a limiting resistor connected in series to the LED are inserted into each register bit, and in parallel with them is a storage capacitor, And the valve is turned on and counter with the Photodiode.