Very Low Voltage Rail-to-Rail Programmable-Gain CMOS Amplifier

Authors:
Jaime Ramírez-Angulo;Antonio J. López-Martín;Ramón G. Carvajal;Chad Lackey
Affiliations:
Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, NM 88003, USA. jramirez@nmsu.edu;Department of Electrical and Electronic Engineering, Public University of Navarra, Campus Arrosadía E-31006, Pamplona, Spain. antonio.lopez@unavarra.es;Dpto. de Ingeniería Electrónica, Escuela Superior de Ingenieros, Universidad de Sevilla, Camino de los Descubrimientos E-41092, Sevilla, Spain. carvajal@gte.esi.us.es;Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, NM 88003, USA. chalacke@nmsu.edu
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2003

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Abstract

A novel design technique for operating closed-loop amplifier circuits at very low supply voltages is proposed. It is based on the use of quasi-floating gate transistors, avoiding issues encountered in true floating-gate structures such as the initial floating-gate charge, offset drift with temperature, and the gain-bandwidth product degradation. A programmable-gain differential amplifier is designed and implemented following this method. Measurement results of an experimental prototype fabricated in a 0.5-μm CMOS technology validate on silicon the proposed technique.