W-CDMA 1 chip SiGe TX-IC with high dynamic range and accurate temperature compensation VGA

This paper demonstrates the 1chip SiGe TX-IC for W-CDMA mobile terminals. For the TX-IC, a novel architecture of a variable gain amplifier is proposed to improve temperature compensation of gain and distortion. And current consumption of variable gain amplifier can be reduced with power control level and it is constant over temperature. The current consumption of the TX-IC is 84 mA with output power of +7 dBm, and it is reduced to 63 mA with output power of -83.5 dBm. With the 0.25 /spl mu/m SiGe BiCMOS technology, this TX-IC achieved high dynamic range over 100dB within /spl plusmn/2.5 dB accuracy over temperature.