Patent ID: 6879278
Filing Date: 2005-04-12
Classification: G04F,H03M

Abstract:
1. An A/D conversion method comprising: modulating by an analog input signal a delay time of delay units in a pulse delay circuit comprised of a plurality of series-connected delay units outputting a pulse signal with a delay; inputting a pulse signal to said pulse delay circuit so as to propagate the pulse signal through said pulse delay circuit, latching output signals from the delay units forming said pulse delay circuit at predetermined timings, and generating digital data expressing reached positions of the pulse signal in said pulse delay circuit based on the levels of the latched signals so as to digitalize said analog input signal, characterized by latching the output signals from the delay units forming said pulse delay circuit and generating said digital data simultaneously using a plurality of pulse position digitalizing means, shifting the input timings of the output signals from the delay units by a time shorter than a delay time of said delay units for each of the pulse position digitalizing means, and adding digital data obtained by the pulse position digitalizing means.