Patent ID: 6501412
Filing Date: 2002-12-31
Classification: H03M

Abstract:
In an analog-to-digital conversion circuit comprising a series of quantizers interconnected in cascade for converting an analog voltage to target digital data corresponding to the analog voltage, each of said quantizers comprising:a comparator for receiving a first analog voltage and comparing the first analog voltage with a reference voltage to output a result of comparison; a first amplifier for amplifying a difference voltage representative of a difference of the first analog voltage from the reference voltage to output a first output voltage; a second amplifier for inverting the difference voltage to produce an inverted difference voltage and amplifying the inverted voltage to output a second output voltage; a switch circuit connected to said first and second amplifiers for selecting either one of the first and second output voltages in response to the result of comparison to form a second analog signal, the second analog voltage being fed to following one of said quantizers as the first analog voltage; and a data output circuit for receiving first digital data from preceding one of said quantizers and producing second digital data in accordance with the first digital data and the result of comparison, the second digital data being fed as the first digital data to said following quantizer and forming part of the target digital data.