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In this paper, we show that the signal transfer function of continuous-time ΣΔ modulators can be used to remove the baseband analog filters in radio receivers. General expressions for the signal transfer function of continuous-time ΣΔ modulators are derived. Comparisons between the frequency response of feedforward and feedback architectures of discrete-time and continuous-time ΣΔ modulators are established. Filtering of GSM adjacent channel blockers using a 5th order continuous-time ΣΔ is given as an example.