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Low cost ASIC architecture for safety critical applications monitoring an applied stimulus

机译：用于安全关键型应用的低成本ASIC架构，用于监控应用的激励

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摘要

An ASIC (14, 14′, 14″) conditions two independent outputs (VINM, VINP) of a full Wheatstone piezoresistive bridge (12) in separate conditioning paths. Each path is provided with a bridge supply voltage (VHB1, VHB2) which can serve as a temperature related input signal to respective offset and gain compensation control circuits. The half bridge outputs are inputted to respective amplifiers (U1, U2) along with a selected percentage of the temperature dependent bridge supply voltage. The outputs of the amplifiers provide a signal proportional to respective half bridge output voltage. In one embodiment, the output of the amplifier (U2) in one conditioning path of one half bridge is connected to the input of an amplifier (U4) in the other conditioning path to provide a signal in the one path proportional to the Wheatstone bridge differential output voltage and in the other path a signal proportional to the Wheatstone half bridge output voltage. In another embodiment, the temperature dependent bridge supply voltage is multiplexed for a selected time upon power-up to an amplifier (U5) which normally receives an input from one of the bridge outputs.

机译：ASIC（ 14，14＆prime ;, 14＆Prime; ）在单独的调节路径中调节完整惠斯登压阻电桥（ 12 ）的两个独立输出（VINM，VINP）。每条路径都提供一个电桥电源电压（VHB 1 ，VHB 2 ），该电压可以用作与温度有关的输入信号，分别提供给失调和增益补偿控制电路。半桥输出连同所选的取决于温度的桥电源电压的百分比一起输入到各个放大器（U 1 ，U 2 ）。放大器的输出提供与各自的半桥输出电压成比例的信号。在一个实施例中，在一个半桥的一个调节路径中的放大器的输出（U 2 ）被连接到另一半的放大器的输入（U 4 ）的输入。调节路径在一个路径中提供与惠斯通电桥差分输出电压成比例的信号，而在另一路径中提供与惠斯通电桥半桥输出电压成比例的信号。在另一个实施例中，与温度有关的电桥电源电压在加电后在选定的时间被多路复用到放大器（U 5 ），该放大器通常从电桥输出之一接收输入。 展开▼

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公开/公告号US2004075447A1

专利类型

公开/公告日2004-04-22

原文格式PDF

申请/专利权人 CORKUM DAVID L.;KAWATE KEITH W.;MAHER THOMAS R.;
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申请/专利号US20020277797

发明设计人 KEITH W. KAWATE;DAVID L. CORKUM;THOMAS R. MAHER;
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申请日2002-10-22

分类号G01R27/08;

国家 US

入库时间 2022-08-21 23:18:27

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