Universal purpose optoelectronic logic element with input optical switching of AND/NAND, OR/NOR and XOR/XNOR functions.Shustov is a doctor of technical sciences, candidate of chemical sciences and the author of over 750 printed works in the field of electronics, chemistry, physics, geology, medicine, and history. Table 1 The truth table of the 3XOR logic element. Table 1 (truth table) characterizes the output signal level of a 3XOR logic element depending on the set of input signals.įigure 5 The logic element 3XOR on bipolar transistors.įigure 6 The logic element 3XOR on field-effect transistors. 1” are applied to both inputs of the device, both transistors Q1 and Q2 will open and prohibit the passage of input signals to the output of the device.Īnalogs of the 3XOR logic element, Figure 5 and Figure 6, are much more complicated than the previous ones, but it is worth considering that due to the increased complexity of execution or for other reasons, such elements in the form of microcircuits are not produced. 0” level signal is applied to the input X1. 1” level signal is applied to the input X2, and a “Log. Of course, the output voltage will be slightly lower than the input, which in most cases is not critical for the operation of digital equipment, especially working in the area of elevated voltages.Ī similar situation will occur when a “Log. 0” level is applied to the input X2, this signal will pass through the resistor R1 and the diode D1 to the output Y of the device. 1” level is applied to one of its inputs, for example, X1, and a signal of the “Log. 0” will also be observed at the output of the element. 0” levels are present at the inputs X1 and X2, “Log. ![]() The following variants of analogs of the 2XOR logic element are made on field-effect ( Figure 3) and bipolar ( Figure 4) transistors.įigure 3 The logic element 2XOR on field-effect transistors.įigure 4 The logic element 2XOR on bipolar transistors. Transistors Q1 and Q2, as well as resistor R2, serve as the 2AND element.įigure 2 The logic element XOR composed of discrete elements. The second variant of the 2XOR element is shown in Figure 2. Figure 1 The XOR logic element and its analog using discrete elements.
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