The architecture of delta sigma analog-to-digital converters usinga voltage-controlled oscillator as a multibit quantizer

摘要

This brief proposes a new- architecture for the oversamplingndelta-sigma analog-to-digital converter (ADC) utilizing a voltagencontrolled oscillator (VCO). The VCO, associated with a pulse counter,nworks as a high-speed quantizer. This VCO quantizer also has thenfunction of first-order noise shaping because the phase of the outputnpulse is an integrated quantity of the input voltage. If the maximum VCOnfrequency (fvm) is designed in the range ofn(2bq-2)fos