A fully-differential switched capacitor chopper stabilized high-pass filter (mirrored integrator)

This work presents a new design for fully differential, high-pass switched-capacitor (SC) filter. The frequency dependence of the filter transfer function is the mirrored image (around one-half of the Nyquist frequency) of the low-pass integrator transfer function, thus we refer to the new filter as the "mirrored integrator" (MI). The MI will be a key element in the design of Nyquist band signal processing applications such as two-path band-pass ΣΔ analog to digital converters (ADC\´s) and high-pass ΣΔ ADC\´s. A chopper stabilization method is inherently employed in the design to suppress the DC offset and 1/f noise of the opamp.