The linearity of the two-MOSFET and four-MOSFET integrators used in MOSFET-C continuous-time filter implementations is compared using the charge-sheet model. The results question the widely-accepted superiority of the four-MOSFET structure in terms of higher attenuation of odd-order harmonic distortions.
Flandre, D., & Jespers, P. (1995). Charge-sheet Modeling of Mos I-v Fundamental Nonlinearities in Mosfet-c Continuous-time Filters. Electronics Letters, 31(17), 1419-1420. https://doi.org/10.1049/el:19951016 (Original work published 1995)