Low distortion and compact RF switch circuitry with the combination of PIN-diode and GaAs-FET for GSM quartet-band cellular phone

We have newly developed the antenna switch module for GSM quartet-band (CSMSSO/EGSM/DCS/PCS) cellular phones. The developed module contains the function of one diplexer, two PIN-diode switches, two low-pass filters, two GaAs-FET switches and several matching circuitries on and in the LTCC substrate. PIN-diode switches, which were used as Tx-Rx path selector, could suppress the harmonics generation in transmitting mode. GaAs-FET switches, which were used as Rs path selector, could reduce the current consumption in receiving mode and make the module size smaller. All function were integrated into compact module size of 5.4r4.0x1.5mm.