PROJECT TITLE :
Effect of Switched-Capacitor CMFB on the Gain of Fully Differential OpAmp for Design of Integrators - 2018
Switched capacitor common-mode feedback (SC-CMFB) may be a common technique for stabilization of the output common-mode level of absolutely differential operational amplifiers. It provides blessings of excellent linearity across a good amplifier output swing, lowest power consumption, and better feedback loop stability in distinction to continuous CMFB; and hence, are suitable for realization of high-gain wide-swing low-power opamps. But, its implementation demands careful thought of some practical aspects, a variety of that are well documented in literature. But, its detrimental impact on the amplifier's differential-mode gain isn't quite explored. Equivalent resistive loading from the SC-CMFB is the explanation for this impact, and is significantly necessary in op-amps meant to possess giant gain (like, the folded cascode). This SC-CMFB induced drop in amplifier dc-gain, and the resultant result on the planning of continuous and discrete-time integrators are mentioned together with pertinent analytical derivations and transistor level simulations. A few practical guidelines and circuit topologies for minimizing the gain reduction impact have additionally been provided.
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