A 2.7-V SiGe HBT variable gain amplifier for CDMA applications |
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Authors: | Chang-Woo Kim Young-Gi Kim |
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Affiliation: | Coll. of Electron. & Inf., Kyung Hee Univ., Kyunggi-Do, South Korea; |
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Abstract: | A monolithic SiGe HBT variable gain amplifier with high dB-linear gain control and high linearity has been developed for CDMA applications. The VGA achieves a 30-dB dynamic gain control with a control range of 0-2.7 Vdc in 824-849 MHz band. The maximum gain and attenuation are 23 dB and 7 dB, respectively. Input/output VSWRs keep low and constant despite change in the gain-control voltage. At a low operation voltage of 2.7 V, the VGA produces a 1-dB compression output power of 13 dBm and /spl plusmn/885-kHz ACPR of -57 dBc at a 5-dBm output power. |
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