Capacitive-voltage-division-type multi-bit quantizer

Abstract

The invention discloses a capacitive-voltage-division-type multi-bit quantizer, comprising two groups of capacitive voltage division circuits for providing reference voltage signals for dynamic comparators and a plurality of dynamic comparators for comparing the reference voltage signals with an input voltage signal and generating output voltage signals. In the capacitive-voltage-division-type multi-bit quantizer disclosed by the invention, the novel capacitive voltage division circuits are used as voltage division circuits, MOSCAP (Metal-Oxide-Semiconductor Capacitor) capacitors are used as the core devices in the voltage division circuits and the dynamic comparators are used as comparison devices, therefore the circuits of the quantizer are simplified, the static power consumption of the quantizer is basically eliminated, the total capacitance consumed by the capacitive voltage division circuits is greatly reduced, the capacitive voltage division precision is effectively improved and the area of the quantizer is prominently optimized, and the capacitive-voltage-division-type multi-bit quantizer is suitable for a miniaturized analog-to-digital converter with ultralow power consumption.

Description

technical field [0001] The invention belongs to the technical field of analog-to-digital conversion, and in particular relates to a capacitive voltage-dividing multi-bit quantizer. Background technique [0002] The quantizer is an important part of the analog-to-digital converter (ADC). It quantizes the analog signal and finally generates a binary code. The result of quantization has a great impact on the performance of the ADC. At present, most of the mainstream Delta-Sigma ADCs use a one-bit quantizer to quantize the signal, and its performance accuracy often cannot meet the performance requirements of the growing electronic products. Therefore, low-power, high-precision multi-bit quantization Delta-Sigma ADC came into being, figure 1 It is the schematic diagram of the structure of the main component of the Delta-Sigma modulator. The feedforward part of the modulator accumulates all signals and sends them to the quantizer for processing. In order to reduce the requiremen...

AI Technical Summary

Problems solved by technology

However, the capacitive quantizer is relatively limited in terms of area optimization, and its capacitive voltage divider circuits are numerous and consume relatively large capacitance

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