Design of Transmit/Receive Switches in CMOS

Abstract

In this chapter, a concise comparison of wireless communication technologies was provided, from which we noticed that time‐division duplexing ( TDD ) is becoming popular and operating frequency continues increasing. We focused our discussion on an important block, i.e., transmit/receive switch (T/R switch) in a TDD‐based radio front‐end. The discussion started with different categories of T/R switch topologies, followed by device models, and then various design techniques. In particular, we looked at techniques including optimizing device dimensions, maximizing/minimizing substrate resistance, body‐floating, transistor stacking, stepped impedance, and traveling wave concept. Besides a detailed summary on proposed design techniques, recommendation on future work was also provided. Continued innovations and novel ideas on design techniques may provide a comprehensive CMOS solution to the challenges of design of T/R switches for mobile cellular and radio systems operating at 60‐GHz or even high frequencies.