Processing speed can also be improved due to the relatively low resistance compared to the NMOS-only or PMOS-only type devices. This configuration greatly reduces power consumption since one of the transistors is always off in both logic states. Alternatively, inverters can be constructed using two complementary transistors in a CMOS configuration.
However, because current flows through the resistor in one of the two states, the resistive-drain configuration is disadvantaged for power consumption and processing speed. Since this "resistive-drain" approach uses only a single type of transistor, it can be fabricated at a low cost. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor. If the applied input is low then the output becomes high and vice versa. Its main function is to invert the input signal applied. Electronic implementation Īn inverter circuit outputs a voltage representing the opposite logic-level to its input. A slash (/) before the variable is also used. Ī bar or overline ( ‾ ) above a variable can denote negation (or inversion or complement) performed by a NOT gate. Sometimes only the circle portion of the symbol is used, and it is attached to the input or output of another gate the symbols for NAND and NOR are formed in this way. To symbolize active-low input, sometimes the bubble is instead placed on the input line. Input and output lines are attached to the symbol the bubble is typically attached to the output line. The traditional symbol for an inverter circuit is a triangle touching a small circle or "bubble". The terms "programmable inverter" or "controlled inverter" do not refer to this gate instead, these terms refer to the XOR gate because it can conditionally function like a NOT gate. All other logic gates may be made from these three. Together with the AND gate and the OR gate, any function in binary mathematics may be implemented. The NOT gate is one of three basic logic gates from which any Boolean circuit may be built up. It is also called the complement gate because it produces the ones' complement of a binary number, swapping 0s and 1s. Because it has only one input, it is a unary operation and has the simplest type of truth table. It is equivalent to the logical negation operator (¬) in mathematical logic.
As with all binary logic gates, other pairs of symbols - such as true and false, or high and low - may be used in lieu of one and zero. Colloquially, this inversion of bits is called "flipping" bits. The NOT gate outputs a zero when given a one, and a one when given a zero. The bits are typically implemented as two differing voltage levels.ĭescription Inverter truth table It outputs a bit opposite of the bit that is put into it. In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. Logic gate implementing negation Traditional NOT gate (inverter) symbol
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