System and method for adaptive sigma-delta modulation

Abstract

A method and system for an adaptive sigma-delta (Σ-Δ) modulator with one bit quantization that improves the signal-to-noise (SNR) of a Σ-Δ modulator is presented. A difference signal is produced representing the difference between an analog input signal x(n) and a first adaptive feedback signal z(n), the amplitude of the analog input x(n) within a first range [−a, +a]. The difference signal is accumulated to produce a first accumulated signal representing an accumulation of the difference signal. The first accumulated signal is then quantized, creating a first quantized digital signal y0(n). Based on the first quantized digital signal y0(n) a first digital output signal z0(n) is produced, such that the instantaneous magnitude of the first analog feedback signal z(n) is substantially kept within the first range [−a, +a] and greater than the analog input signal's x(n) instantaneous magnitude. A digital-to-analog conversion is performed on the first digital output signal z0(n) to produce the first adaptive feedback signal z(n).

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