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1. 发明专利

JPS5776918A A/d converter 失效
标题翻译： A / D转换器
公开(公告)号：JPS5776918A
公开(公告)日：1982-05-14
申请号：JP15265080
申请日：1980-10-30
申请人： Fujisoku:Kk
发明人： TAKASAKI MASAHIKO , MIZUKAMI KUNIO , NISHIMURA KATSUTOSHI
IPC分类号： H03M1/18 , H03K13/02
CPC分类号： H03M1/18
摘要： PURPOSE:To obtain a resolution bit number of more of an A/D converter, by switching an A/D conversion input through the provision of a level switching circuit. CONSTITUTION:An analog voltage corresponding to a detected temperature of a thermister 21 is outputted from an operational amplifier 26. This analog voltage is devided by variable resistors 28, 29 and respectively amplified by operational amplifiers 31, 39. At a low voltage region where the detected temperature is low, an output signal of the operational amplifier 31 is converted into a digital signal at an A/D converter 46. If the output digital value of the converter 46 exceeds a set value, a transistor 48 is conductive by an output signal from an operational amplifier 47, and an output signal of the amplifier 39 is converted into a digital signal by the A/D converter 46 in place of the operational amplifier 31.
摘要翻译：目的：通过提供电平切换电路来切换A / D转换输入，以获得更多A / D转换器的分辨率位数。构成：对应于热敏电阻21的检测温度的模拟电压从运算放大器26输出。该模拟电压由可变电阻28,29分离，并由运算放大器31,39分别放大。在低电压区检测温度低时，运算放大器31的输出信号在A / D转换器46被转换为数字信号。如果转换器46的输出数字值超过设定值，晶体管48通过输出信号导通来自运算放大器47，放大器39的输出信号由A / D转换器46代替运算放大器31转换成数字信号。

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