A low-voltage low-power wide-range CMOS variable gain amplifier

In this paper, a compact low-power (LP) low-voltage (LV) metal-oxide-semiconductor-only (MOS-only) variable gain amplifier (VCA) is introduced. This amplifier based on complementary MOS (CMOS) transistors operating in strong inversion is composed of a pseudo-exponential current-to-voltage converter,...

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Veröffentlicht in:	IEEE transactions on circuits and systems. 2, Analog and digital signal processing Analog and digital signal processing, 1998-07, Vol.45 (7), p.800-811
Hauptverfasser:	Motamed, A., Changku Hwang, Ismail, M.
Format:	Artikel
Sprache:	eng
Schlagworte:	Amplifiers Analog circuits Analog integrated circuits Applied sciences Circuit properties Digital circuits Dynamic range Electric, optical and optoelectronic circuits Electronic circuits Electronics Energy consumption Exact sciences and technology Gain Laboratories Transconductance Very large scale integration Voltage
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Beschreibung
Zusammenfassung:	In this paper, a compact low-power (LP) low-voltage (LV) metal-oxide-semiconductor-only (MOS-only) variable gain amplifier (VCA) 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-/spl mu/m MOSIS n-well process, and its simulation and measurement results are shown in detail.
ISSN:	1057-7130 1558-125X
DOI:	10.1109/82.700927