A Low-Voltage Fully Differential Constant-Gm Rail-to-Rail CMOS Operational Amplifier |
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Authors: | Giuseppe Ferri Willy Sansen Vincenzo Peluso |
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Affiliation: | (1) Universita L Aquila, Italy, Loc.Monteluco Roio, 67040 Poggio di Roio;(2) Katholieke Universiteit Leuven, Belgium, Kardinaal Mercierlaan 94, 3001 Heverlee |
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Abstract: | A low-voltage fully differential CMOS operational amplifier withconstant-gmand rail-to-rail input and output stages ispresented. It is the fully differential version of a previously realizedsingle-ended operational amplifier where a novel circuit to ensure constanttransconductance has been implemented 1]. The input stage is a rail-to-railstructure formed by two symmetrical OTAs in parallel (the input transistorsare operating in weak inversion). The class-AB output stages have also afull voltage swing. A rail-to-rail input common mode feedback structureallows the output voltage control. Measurements in a 0.7 µ standardCMOS process with threshold voltages of about 0.7 V have been done. Theminimum experimental supply voltage is about 1.1 V. The circuit provides a60 dB low frequency voltage gain and about 1.5 MHz unity gain frequency fora total power consumption of about 0.72 mW at a 1.5 V supply voltage. |
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Keywords: | low-voltage low-power analog integrated circuits fully differential constant-gm operational amplifiers |
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