RU2024188C1 - Optoelectronic matching device - Google Patents

Abstract

FIELD: pulse technique. SUBSTANCE: optoelectronic matching device is provided with integrating link 2 inserted between input bus and light-emitting diode 3 optically coupled with photodetector 4 of signal shaping unit 5. Additional tunnel diode 6 is cumulatively connected in series with light-emitting diode 3. EFFECT: provision for using device as signal frequency tripler with minimum quantity of components and connections. 2 dwg

Description

 The invention relates to a pulse technique and can be used in frequency multipliers, in measuring equipment and automation.

 Known frequency multiplier [1], which allows to receive signals of triple frequency. It contains an operational amplifier, a bipolar signal source, a voltage divider with a midpoint, two diodes in series.

 This device has a large number of elements and functional connections between them and requires the use of a bipolar signal source. This device is purely analog type and for use as part of digital devices requires additional matching elements. It also has no galvanic isolation of input circuits from the output.

 Also known device [2], which does not allow to receive pulses of triple frequency.

 The aim of the invention is to strengthen and expand the functionality by multiplying the frequency of the output signal.

 To do this, an integrating element is inserted into the optoelectronic coordinator containing the input bus connected via a resistor to the anode of the light-emitting diode optically coupled to the photodetector of the signal-forming device, which is connected between the input bus and the anode of the light-emitting diode, the cathode of which is connected to the anode of the introduced tunneling diode, another output which is connected to the housing.

 In FIG. 1 shows the electrical circuit of the coordinator; in FIG. 2 - time diagrams of voltages and currents on circuit elements.

 The optoelectronic coordinator includes an input bus 1, an integrating link 2, an LED 3 with a photodetector 4, a signal generation circuit 5, a tunnel diode 6, an output bus 7.

 Optoelectronic coordinator works as follows.

With the arrival of a positive difference in the input signal (Fig. 2, U ₁ ) on the anode of LED 3, the potential begins to grow (Fig. 2, U ₃ ), the slew rate of which is determined by the parameters of the integrating link 2. At the same time, the current through diodes 3 and 6 grows (Fig. . 2, I ₆ ). At time t _{1, the} voltage at the output of the integrating link 2 (Fig. 2, U ₃ ) reaches a value that corresponds to the peak current of the tunneling diode 6. This value is ≈ 1.5 V at the anode of diode 3. A further increase in potential at the anode of diode 3 ( Fig. 2, U ₃ ) leads to a decrease in the current through the diodes (Fig. 2, I ₆ ). The time t ₂ corresponds to the voltage of the depression on the characteristic of the tunnel diode 6, i.e. minimum value of current through diodes. Further, with increasing voltage at the output of the integrating link 2 in the section t ₂ -t _{3 the} current through the diodes again increases in the diffusion section of the characteristics of the tunneling diode. At the end of the input pulse at time t _{3, the} current through the diodes decreases again and passes from the diffusion section of the characteristic through the cavity at time t ₄ (Fig. 2, I ₆ ). The voltage at the output of the integrating link 2 decreases as the capacitor of the integrator 2 discharges. At time t _{5, the} current through the diodes passes the peak current of the tunnel diode 6. At this moment, the current through the diodes again reaches its maximum value. The light energy of the LED 3 is directed to the photodetector 4 and opens it, as a result of which another voltage drop is formed on the output bus 7. With the arrival of another positive impulse, the processes are repeated.

In the signal conditioning circuit 5, the signal is amplified to form the edges of the pulses coming from the photodetector 4. Triple output pulses are generated on the output bus 7 (Fig. 2, U ₇ ) in accordance with the frequency of the diode current pulses (Fig. 2, I ₆ ) .

 The parameters of diodes 3 and 6, i.e. light-emitting and tunneling, must comply with current characteristics. For example, the tunnel diodes ZI306 and GI305 provide the necessary mode of operation of the LED of the 249LP1 chip as a frequency multiplier by three.

 Thus, the invention allows to expand the functionality of optoelectronic elements.

Claims (1)

 OPTOELECTRONIC AGREEMENT, containing an LED optically coupled to a photodetector, the outputs of which are connected to a signal amplifier, the output of which is connected to the output bus, characterized in that a tunnel diode and an integrating link are inserted, which is connected between the input bus and the anode of the LED, the cathode of which is connected in series The included tunnel diode is connected to a common bus.

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