Mixed circuits are electronic circuits that combine both analog and digital components. This integration allows for the processing of a wide range of signals, making them versatile for various applications. For example, they can be used in devices like smartphones and audio equipment, where both types of signals are essential for functionality. These circuits typically include elements such as transistors, resistors, and capacitors to manage the flow of electricity. The design of mixed circuits requires careful consideration to minimize interference between the analog and digital parts, ensuring optimal performance and reliability in devices that rely on them.