Overview of TTD from Electrical Optical to Acoustic Domain

True time delays (TTD) have applications in wideband antenna arrays, self-interference cancellation, etc. Realization of compact low-loss on-chip TTDs has been challenging. This talk covers examples of electrical, optical, and acoustic approaches for TTDs that may be implemented in commercial foundry processes. In the electrical domain, on-chip transmission lines and various all-pass electrical networks will be discussed. In the optical domain, low-loss realization of silicon photonic variable delay lines will be covered. Finally, representative surface acoustic wave delay lines will be shown.