VOLTAGE NULLING PRESSURE SENSOR PREAMP

Pressure sensors (B1, B2, R19, R20) that can be reliability operated with the maximum current flowing through the device (210, 220, 230) restricted to 10uA or below, or below 50uA in a single-fault condition. This can provide at least a reduced need for the final medical device architect to consider potential risks from excessive current to the patient, simplifying the design and manufacturabilityof the medical device. An additional benefit is that the sensors (B1, B2, R19, R20) are generally more accurate at lower current flow, as self-heating of the resistors (B1, B2) and parasitic leakagesare reduced, if the signal-to-noise problem is resolved. 压力传感器(B1、B2、R19、R20)可以在流过设备(210、220、230)的最大电流被限制到10μA或以下、或者在单故障条件下被限制到低于50μA的情况下可靠运行。这可以提供至少最终医疗设备设计者考虑来自对患者的过大电流的潜在风险的降低的需求，简化了医疗设备的设计和可制造性。附加的好处是，如果信噪比问题得到解决，则传感器(B1、B2、R19、R20)在较低电流下通常更精确，因为电阻器(B1、B2)的自加热和寄生漏电减少了。