A digital common-mode rejection technique for differential analog-to-digital conversion

Prediction of the Spectrum of a Digital Delta–Sigma Modulator Followed by a Polynomial Nonlinearity

“…11. The 1-bit quantizer in the EFM implements the following operation: (26) where is the step size of the quantizer. The modulator is simulated with the following parameters: , , and .…”

“…Swaminathan et al [21] addressed the problem of spurious tones by proposing a digital requantizer that does not generate spurious tones after nonlinear distortion. It borrows ideas from dc-free codes [23], [24] and dynamic-element-matching tree-structured encoders [25], [26]. A set of quantization error signals is generated by design, so that the spectra of the total quantization error and its running sum do not contain spurious tones when applied to a memoryless truncated power series.…”

A low-complexity low-distortion topology for wideband delta-sigma ADCs

“…When A is given, the input range of the quantizer is V,,,=MA (2) Equation (2) shows that more accurate quantization, i.e., smaller A, requires more quantization levels, and leads to larger circuit. In the commonly used Flash ADC, 2N quantization levels, i.e., 2N comparators are required for a N-bit ADC.…”

“…A I"-order noise-shaping function can provide 18.9dB extra suppression on the noise at an OSR of 16 if the noise is white, which clearly shows the effectiveness of this method. Two structures can be used to implement the noise-shaping requantizer, the classic error feedback coder and the noise-shaping requantizer proposed in [2]. Though in [2] the requantizer is designed to remove only one bit, it can be extended to a general version that can deal with arbitraly bits.…”