ANALOG-TO-DIGITAL CONVERTER,申请号JP20050155575-传众专利搜索

ANALOG-TO-DIGITAL CONVERTER

申请公布号：JP2006333203(A)

申请号：JP20050155575

申请日期：2005.05.27

申请公布日期：2006.12.07

申请人：

FYUUTOREKKU:KK

发明人：SUZUKI MASAHIRO

分类号：H03M1/14;H03M1/60;H03K5/26

主分类号：H03M1/14

摘要：PROBLEM TO BE SOLVED: To provide an A/D converter utilizing a V-F conversion to conduct an AD conversion very accurately, without having to enhance the conversion frequency. SOLUTION: Two VCOs are provided and a V-F conversion value of the period or shorter of a main VCO is calculated by utilizing the periodic difference of both VCOs. The high-order bit of a digital signal is generated, by calculating the number of pulse of a pulse signal output from BASE-VCO 1 by a counter 4. Meanwhile, a lower bit is generated, by calculating a phase difference from the beginning within a sampling period to a first pulse generation within the sampling period of the output of the BASE-VCO 1 by a third register 10 and the second and third subtractors 11 and 12 each sampling period, based on the number of pulse of the output of the BASE-VCO 1, included between an activation time of a present sampling signal Ps and a phase coincidence time of the outputs of the BASE-VCO 1 and JAW-VCO 2. COPYRIGHT: (C)2007,JPO&INPIT