寻求几篇VGA（variable gain amplifier）论文，谢谢！

寻求几篇VGA-variable gain amplifier 论文，谢谢！
1. Po-Chiun Huang, Li-Yu Chiou and Chorng-Kuang Wang, "A 3.3-V CMOS
wideband exponential control variable-gain amplifier", in Proc. IEEE Int. Symposium on
Circuits and Systems, 1998, vol. 1, pp. 285 -288.
2. K. M. Abdelfattah and A. M. Soliman, ìVariable gain amplifiers based on a new
approximation method to realize the exponential functionî,  IEEE Trans. Circuits and
Systems I: Fundamental Theory and Applications, vol. 49, no. 9, pp. 1348-1354, Sept.
2002.
3. K. M. Abdelfattah and A. M. Soliman, ìVariable gain amplifiers based on a new
approximation method to realize the exponential functionî,  IEEE Trans. Circuits and
Systems I: Fundamental Theory and Applications, vol. 49, no. 9, pp. 1348-1354, Sept.
2002.

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