Abstract
Digital mismatch calibration for quantized analog (QA) signal processing is proposed for the first time. Since the proposed calibration mechanism does not require uniform QA slicer levels, non-uniform quantization can be applied to improve the system performance. We propose two methods utilizing the genetic algorithm and <inline-formula> <tex-math notation="LaTeX">$\mu $ </tex-math></inline-formula>-law to find non-uniform slicer levels offering superior performance compared to uniform levels. Simulations show that for a QA amplifier consisting of 32 slices, the signal-to-noise-and-distortion ratio (SNDR) under a multitone input can be doubled by adjusting only the quantization levels while maintaining the same structure and same power, compared to uniform quantization levels that provide 54 dB of SNDR.
Highlights
Slicer quantized analog (QA) Signal CombinerQ UANTIZED analog (QA) signal processing is a technique that decomposes the signal into multiple portions, where each portion is processed by an independent signal path
The ALC significantly reduces the QA amplifier gain ripple by tuning the summation weight of each slice digitally for the input range covered by the training signal
We expect the signal to for QA quantization level optimization is the genetic algorithm (GA) [23], which be non-uniformly distributed over the input range, affording is an evolutionary algorithm inspired by the law of natu
Summary
Q UANTIZED analog (QA) signal processing is a technique that decomposes the signal into multiple portions, where each portion is processed by an independent signal path. Compared to an analog amplifier, a QA amplifier has an expanded DR because its compression point can be higher than the voltage supply [2]. The QA receiver front-end in [1] has a reconfigurable DR, and its 1-dB 10-June-2020 compression point can be tuned from -8.5 to 10.5 dBm under a 0.8-V supply. The first block is the slicer, whose job is to determine which portion of the input signal each slice shall process. Depending on the input signal level and the offset of each slice, some slices carry the liquid digital “bits” by saturating to ground or the supply voltage while others carry the analog residue [1]. 10-June-2020 latter suffers from the DR limitation imposed by the supply voltage, whereas the DR of a digital combiner is limited by the number of bits available. It is desirable to include an ADC before the combiner to allow for digital recombination,
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