Abstract
This paper presents, for the first time, the study of the application of a lateral diffused metal-oxide-semiconductor field-effect transistor (LDMOSFET) in a common-gate configuration to radio-frequency (RF) transmit/receive (T/R) switching circuits. A single-pole double-throw (SPDT) 900-MHz T/R switch is implemented using 0.25-LDMOSFET foundry technology. Measured results show that our switching circuit can achieve a low insertion loss of 0.82 dB and a high power handling capability of 27 dBm. This result is promising in integrating power management integrated circuits, RF power amplifiers, and switching circuits in a single chip, based on LDMOSFET technology, to realize an RF transmit front-end system-on-chip solution.
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