We demonstrated the feasibility of the adaptive frequency compensation approach to design maximum-and constant-bandwidth feedback amplifiers. A basic CMOS amplifier exhibiting 66-dB dc gain and 310-MHz gain-bandwidth product was designed. For closed-loop gains ranging from 1 to 10, the closed loop bandwidth was found never lower than 401 MHz. A similar amplifier with equal gain-bandwidth product, but adopting the traditional fixed compensation approach, would exhibit a closed-loop bandwidth decreased to 33 MHz when the gain magnitude is set to 10. The enhanced frequency performance is obtained with a 48% increase in current consumption, while the other main opamp performance parameters remain almost unchanged compared to the standard solution. © 2012 IEEE.
Constant and maximum bandwidth feedback amplifier with adaptive frequency compensation / Salvatore, Pennisi; Scotti, Giuseppe; Trifiletti, Alessandro. - (2012), pp. 436-439. (Intervento presentato al convegno 2012 IEEE International Symposium on Circuits and Systems, ISCAS 2012 tenutosi a Seoul nel 20 May 2012 through 23 May 2012) [10.1109/iscas.2012.6272057].
Constant and maximum bandwidth feedback amplifier with adaptive frequency compensation
SCOTTI, Giuseppe;TRIFILETTI, Alessandro
2012
Abstract
We demonstrated the feasibility of the adaptive frequency compensation approach to design maximum-and constant-bandwidth feedback amplifiers. A basic CMOS amplifier exhibiting 66-dB dc gain and 310-MHz gain-bandwidth product was designed. For closed-loop gains ranging from 1 to 10, the closed loop bandwidth was found never lower than 401 MHz. A similar amplifier with equal gain-bandwidth product, but adopting the traditional fixed compensation approach, would exhibit a closed-loop bandwidth decreased to 33 MHz when the gain magnitude is set to 10. The enhanced frequency performance is obtained with a 48% increase in current consumption, while the other main opamp performance parameters remain almost unchanged compared to the standard solution. © 2012 IEEE.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
