Using Finite Impulse Response Feedback DACs to design Σ ∆ modulators based on LC filters

This paper proposes a general method to design the noise-transfer-function of a continuous-time Σ∆ modulator having high-order passive LC loop filters. The feedback signals can have arbitrary shapes and can be applied either at internal nodes or only at the input node. As a design example, this technique is used to design a 4 order Σ∆ modulator where the… (More)