AC Coupling is a method for passing the AC component of a signal while blocking DC. This technique is often used to shift the common mode voltage of a signal. Take for example a analog signal that is implemented in a 5V split rail design where the voltage may swing positive or negative 5V with respect to ground. This signal may be AC coupled and referenced to a 5VDC reference such that the AC component now swings from 0V to 10V. AC coupling is commonly used in Audio and RF circuits, it may also be employed in high speed communication channels and many other applications.
Triad designers are very experienced in identifying applications where techniques such as AC coupling may be required or have significant benefit. Our designers and architects may also identify areas where AC coupling may allow for use of lower cost fabrication processes to meet a customers requirements.