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A novel class of complementary folded-cascode opamps for low voltage
Roewer, F.; Kleine, U.;
Solid-State Circuits, IEEE Journal of
Volume 37,
Issue 8,
Aug. 2002
Page(s):1080
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1083
Abstract:
Three novel complementary folded-cascode operational amplifiers (opamps) with high gain, large bandwidth, and rail-to-rail input range for low-voltage operation will be presented. These opamps feature high bandwidth due to minimum internal nodes. The output swing is increased by properly adjusting the output cascode transistor gate voltages close to the power supply voltages. The opamps have been fabricated with a standard 0.8-μm CMOS technology. Measurements show the amplification is between 60.1 and 72.4 dB, and the unity gain bandwidth is 14 MHz for a 5-pF load, 2.5-V power supply, and 150-μA bias current.
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