发明名称 |
SYNCHRONIZING SIGNAL GENERATING CIRCUIT AND A/D CONVERTER USING THE CIRCUIT |
摘要 |
PURPOSE:To provide the synchronizing signal generating circuit frequency- dividing a master clock to generate two independent new clock systems and the A/D converter without the effect of feed-through. CONSTITUTION:The synchronizing signal generating circuit is provided with a 1st frequency divider means 2 generating a clock (WCLK) with a large frequency division ratio and a 2nd frequency divider means 3 receiving the clock from the 1st frequency divider and generating a clock (CCLK) with a small frequency division ratio used to reset the count of the frequency division at a drive edge of the said clock. The A/D converter employs the synchronizing signal generating circuit and drives a sample-and-hold circuit with an output clock of the 1st frequency divider means 2 and the output clock of the 2nd frequency divider means 3 drives the A/D converter circuit. As a result, since a 2nd clock whose phase is shifted periodically for every occasion in the A/D conversion cycle is not produced, the effect of feed-through due to it is reduced. |
申请公布号 |
JPH05191283(A) |
申请公布日期 |
1993.07.30 |
申请号 |
JP19920021793 |
申请日期 |
1992.01.10 |
申请人 |
YOKOGAWA HEWLETT PACKARD LTD |
发明人 |
HIRASAWA TOSHITSUGU;NAGAO MASATOSHI |
分类号 |
G01R19/25;G01R31/26;H03L7/00;H03M1/12 |
主分类号 |
G01R19/25 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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