What does an inverter do in digital circuits?

An inverter, also known as a NOT gate in digital circuits, performs the function of flipping or inverting the input signal. This means that if the input is a logical high (1), the output will be a logical low (0), and vice versa. The primary role of an inverter is to change the state of a binary signal to its opposite, which is fundamental in digital logic design for various applications.

In digital circuits, the ability to invert signals is essential for creating complex logic functions. Inverters can be used in combination with other logic gates to implement various logical operations based on the requirements of the circuit. This function is particularly useful in applications like signal conditioning, creating control signals, and logic circuit design where the inversion of inputs is necessary.

The other choices do not accurately describe the function of an inverter. Switching the signal suggests a change in the connection or path rather than the value. Doubling the output does not relate to the function of an inverter, as it does not modify the amplitude or the number of signals produced. Storing the signal implies memory functionality, which is not within the scope of an inverter's operations. Therefore, the defining characteristic of an inverter is indeed the ability to flip the signal value.