High pass filter implementation comparison in unity STF high pass ΔΣ modulator

A 96.4 dB high-pass delta-sigma modulator with dynamic biasing and tree-structured DEM

“…2, while the HPF 2 is similar but with the scaled down sampling capacitor and constant biasing. The only difference from the parasitic-insensitive SC integrator is that the integrating capacitors C int1 are alternated around the amplifier at the chopping frequency, f s /2, to produce the high-pass transfer function [8]. The HPF 1 is often the most power consuming block of the whole modulator due to the large capacitive load.…”