Paper Info
Title
Effect of Switched-Capacitor CMFB on the Gain of Fully Differential Op-Amp for Design of Integrators.
Abstract
Switched capacitor common-mode feedback (SC-CMFB) is a popular technique for stabilization of the output common-mode level of fully differential operational amplifiers. It provides advantages of excellent linearity across a wide amplifier output swing, lowest power consumption, and better feedback loop stability in contrast to continuous CMFB; and hence, are suitable for realization of high-gain wide-swing low-power opamps. But, its implementation demands careful consideration of some practical aspects, a number of which are well documented in literature. However, its detrimental effect on the amplifieru0027s differential-mode gain is not quite explored. Equivalent resistive loading from the SC-CMFB is the reason for this effect, and is particularly important in op-amps meant to have large gain (like, the folded cascode). This SC-CMFB induced drop in amplifier dc-gain, and the consequent effect on the design of continuous and discrete-time integrators have been discussed together with pertinent analytical derivations and transistor level simulations. A few practical guidelines and circuit topologies for minimizing the gain reduction effect have also been provided.
Year
Venue
Field
2018
ISCAS
Capacitor,Cascode,Control theory,Computer science,Linearity,Integrator,Switched capacitor,Electronic engineering,Feedback loop,Operational amplifier,Amplifier
DocType
Citations 
PageRank 
Conference
0
0.34
References 
Authors
0
2
Name
Order
Citations
PageRank
Joydeep Basu100.34
Pradip Mandal28423.04