A Very Low Voltage Bipolar Op-Amp for Sensor Applications |
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Authors: | G Ferri M Faccio G Stochino A D'Amico D Rossi G Ricotti |
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Affiliation: | (1) University of L'Aquila, Localita' Monteluco di Roio, 67040 L'Aquila, Italy;(2) Ericsson Telecomunicazioni, Via Anagnina 203, 00040 Roma, Italy;(3) University of Roma Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy;(4) SGS-Thomson, Via Tolomeo 1, 20100 Cornaredo, Milano, Italy |
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Abstract: | A new bipolar four-quadrant operational amplifier operating at a power supply voltage of 0.8 V and with a supply current of 800 A is here presented and illustrated. It features low input offset, low bias current, low noise, low crossover distortion and a rail-to-rail output swing. Control circuits ensuring minimum and maximum current limits for the output transistors have been incorporated. The biasing circuitry follows a PTAT scheme. A simple compensation topology allows the reduction of the area. The chip, whose area is about 2 mm2, has been fabricated in HF2CMOS 2 /6 GHz technology. Finally, Spice simulations and experimental results, which confirm the expected overall performances of the low voltage op-amp, are reported. |
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Keywords: | analog circuit design operational amplifiers low voltage low power |
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