A low-voltage low-power wide-range CMOS variable gain amplifier. Motamed, A., Hwang, C., & Ismail, M. IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1998.
abstract   bibtex   
In this paper, a compact low-power (LP) low-voltage (LV) metal-oxide-semiconductor-only (MOS-only) variable gain amplifier (VGA) is introduced. This amplifier based on complementary MOS (CMOS) transistors operating in strong inversion is composed of a pseudo-exponential current-to-voltage converter, analog multiplier, and output stage. The gain of the amplifier is controlled exponentially by a novel wide-range pseudo-exponential current-to-voltage converter implemented with two back-to-back connected current mirrors exhibiting superb exponential characteristic. Also, a new LV/LP composite transistor is introduced to increase the input dynamic range of the multiplier. The amplifier is fabricated using a 2-μm MOSIS n-well process, and its simulation and measurement results are shown in detail. © 1998 IEEE.
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 title = {A low-voltage low-power wide-range CMOS variable gain amplifier},
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 year = {1998},
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 abstract = {In this paper, a compact low-power (LP) low-voltage (LV) metal-oxide-semiconductor-only (MOS-only) variable gain amplifier (VGA) is introduced. This amplifier based on complementary MOS (CMOS) transistors operating in strong inversion is composed of a pseudo-exponential current-to-voltage converter, analog multiplier, and output stage. The gain of the amplifier is controlled exponentially by a novel wide-range pseudo-exponential current-to-voltage converter implemented with two back-to-back connected current mirrors exhibiting superb exponential characteristic. Also, a new LV/LP composite transistor is introduced to increase the input dynamic range of the multiplier. The amplifier is fabricated using a 2-μm MOSIS n-well process, and its simulation and measurement results are shown in detail. © 1998 IEEE.},
 bibtype = {article},
 author = {Motamed, A. and Hwang, C. and Ismail, M.},
 journal = {IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing},
 number = {7}
}

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