A Comparative Study of Two Techniques for Improving Power-Handling Capability of CMOS T/R Switches
This article proposes an asymmetric topology for transmit/receive (T/R) switches and more importantly presents a comparative study of both LC-tuned and resistive body-floating techniques for improving the power-handling capability of the viz switches in the same 0.18-mu m triple-well CMOS. It is shown from simulations and measurements that the switches adopting either technique achieve comparable performances. For instance, the switch employing the LC-tuned body-floating technique exhibits insertion loss of 1.5 dB, isolation of 23.5 dB, and power-handling capability of 22.5 dBm at 5.2 GHz, whereas the switch using the resistive body-floating technique exhibits insertion loss of 1.3 dB, isolation of 24 dB, and power-handling capability of 22.2 dBm, respectively. Therefore, one can conclude that the asymmetric topology with the resistive body-floating technique is more suitable for designing T/R switches for wireless local area network applications as it consumes smaller silicon area. (C) 2010 Wiley Periodicals. Inc Int J RF and Microwave CAE 20 298-305, 2010
cmos t/r switches power handling