A simple approach for the implementation of CMOS amplifiers with constant bandwidth independent of gain.
ABSTRACT In this paper we discuss an efficient implementation of the Cherry-Hooper amplifier scheme based on a new OTA structure. This is used to design highly linear CMOS amplifiers with programmable and accurate gain and high bandwidth that remains approximately constant with gain adjustment. A fully differential VGA with 30 MHz approximate constant bandwidth and accurate digitally adjustable gain from 1 to 128 in 0.5 mum CMOS technology is discussed. Experimental verification of the proposed scheme is also provided.
Conference Proceeding: New improved CMOS class AB buffers based on differential flipped voltage followers[show abstract] [hide abstract]
ABSTRACT: A new family of high performance buffers is introduced. It is characterized by very low output impedance, wide signal range, wide bandwidth, and low power dissipation, no DC level shift between input and output terminals and class AB operation. The proposed circuits are validated with simulations in 0.5mum CMOS technology and with experimental resultsCircuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on; 06/2006
Conference Proceeding: A free but efficient class AB two-stage operational amplifier.[show abstract] [hide abstract]
ABSTRACT: A low voltage two stage operational amplifier with class AB output stage is presented, featuring simplicity and efficiency. It has a large effective output current boosting factor (~50) and close to a factor 2 bandwidth enhancement. This is achieved at the expense of minimum additional circuitry with no extra static power dissipation. Experimental verification of the characteristics of the proposed circuit is providedInternational Symposium on Circuits and Systems (ISCAS 2006), 21-24 May 2006, Island of Kos, Greece; 01/2006
Conference Proceeding: OTA-GS filters: the new face of RC-active filters[show abstract] [hide abstract]
ABSTRACT: An approach for the direct translation of conventional RC active filters into CMOS integratable structures is presented. This technique is based on the replacement of resistors by differential gain stages, and of op-amps by single ended gain stages. A high-frequency compensated CMOS universal filter derived using this method is shown and experimentally verifiedCircuits and Systems, 1995., Proceedings., Proceedings of the 38th Midwest Symposium on; 09/1995