... 2.9 (a) )has the advantages of simplicity and less parasitic capacitance along with the disadvantage that a cross-axisacceleration signal generates a common-mode output. The common-centroid design ... value of these parasitic capacitors is around 70fF, which is the same order as the total sensingcapacitance. Parasitic capacitance of diodes and input transistors of buffers is relatively small, ... Cd_air, so approximately the totalgap capacitance is equal to the sum of Cm_air and Cd_air, which is close to the gap capacitance of homoge-Vs+Vs-ProofmassVm-Vm+AnchorRigid frameSpringsVs+Vs-Vm-Vm+ (a) ...