A SiGe HBT Variable Gain Driver Amplifier for 5-GHz Applications 


Vol. 31,  No. 3, pp. 356-359, Mar.  2006


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  Abstract

A monolithic SiGe HBT variable gain driver amplifier(VGDA) with high dB-linear gain control and high linearity has been developed as a driver amplifier with ground-shielded microstrip lines for 5-GHz transmitters. The VGDA consists of three blocks such as the cascode gain-control stage, fixed-gain output stage, and voltage control block. The circuit elements were optimized by using the Agilent Technologies' ADS. The VGDA was implemented in STMicroelectronics' 0.35㎛ Si-BiCMOS process. The VGDA exhibits a dynamic gain control range of 34 dB with the control voltage range from 0 to 2.3 V in 5.15-5.35 GHz band. At 5.15 GHz, maximum gain and attenuation are 10.5 dB and -23.6 dB, respectively. The amplifier also produces a 1-dB gain-compression output power of -3 dBm and output third-order intercept point of 7.5 dBm. Input/output voltage standing wave ratios of the VGDA keep low and constant despite change in the gain-control voltage.

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  Cite this article

[IEEE Style]

K. Chae and C. Kim, "A SiGe HBT Variable Gain Driver Amplifier for 5-GHz Applications," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 3, pp. 356-359, 2006. DOI: .

[ACM Style]

Kyu-Sung Chae and Chang-Woo Kim. 2006. A SiGe HBT Variable Gain Driver Amplifier for 5-GHz Applications. The Journal of Korean Institute of Communications and Information Sciences, 31, 3, (2006), 356-359. DOI: .

[KICS Style]

Kyu-Sung Chae and Chang-Woo Kim, "A SiGe HBT Variable Gain Driver Amplifier for 5-GHz Applications," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 3, pp. 356-359, 3. 2006.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880