Baseband stage for WCDMA direct conversion receiver with high dynamic range and accurate temperature compensation |
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Authors: | Seonghan Ryu Sangsue Jin Seunghyun Lee Huijung Kim Jongryul Lee Bumman Kim |
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Affiliation: | Syst. LSI Div., Samsung Electron. Co., Gyeunggi, South Korea; |
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Abstract: | A highly integrated baseband stage, which adopts a new configuration for the wideband code-division multiple access (WCDMA) direct conversion receiver (DCR), is described. The baseband stage satisfies all requirements of the WCDMA DCR and consists of opamp-RC channel select filters and variable gain amplifiers with linear-in-dB gain control. It achieves a high dynamic range of 85 dB with /spl plusmn/1.5 dB accuracy over a temperature variation from -25 to 85/spl deg/C, 16.5 nV//spl radic/Hz input-referred noise, +20 dBV out-of-band IIP3 and +70 dBV out of band IIP2. The baseband stage is fabricated using a 0.35 /spl mu/m SiGe BiCMOS process and consumes a total current of 11 mA/CH from a 2.7 V supply. |
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