In real-life applications mixed-signal designs are everywhere, for example, a smart mobile phone. However, it is more accurate to call them mixed-signal systems. Mixed-signal ICs also process both analog and digital signals together. For example, mixed signal circuit design pdf analog-to-digital converter is a mixed-signal circuit.
Mixed-signal circuits or systems are typically cost-effective solutions for building any modern consumer electronics applications. Mixed-signal ICs are chips that contain both digital and analog circuits on the same chip. Mixed-signal ICs are often used to convert analog signals to digital signals so that digital devices can process them. For example, mixed-signal ICs are essential components for FM tuners in digital products such as media players, which have digital amplifiers. Mixed-signal ICs are more difficult to design and manufacture than analog-only or digital-only integrated circuits. For example, an efficient mixed-signal IC would have its digital and analog components share a common power supply. However, analog and digital components have very different power needs and consumption characteristics that make this a non-trivial goal in chip design.
Automated testing of the finished chips can also be challenging. Testing functional operation of mixed-signal ICs remains complex, expensive and often a “one-off” implementation task. Systematic design methodologies comparable to digital design methods are far more primitive in the analog and mixed-signal arena. Analog circuit design can not generally be automated to nearly the extent that digital circuit design can. Combining the two technologies multiplies this complication. Fast-changing digital signals send noise to sensitive analog inputs. Most modern radio and communications use mixed signal circuits.