| 摘要 |
A preexisting voltage across a sensor (18) is latched to a storage capacitor (C1) prior to any excitation current being applied to the sensor (18). Once the excitation current is applied, the voltage on the storage capacitor (C1) is directly subtracted from a differential voltage across the sensor (18). The subtraction is done before a measurement is converted to a digital value and passed to a transmitter (10). The subtraction is performed in hardware, and a time required to sample and hold the preexisting voltage across the storage capacitor is within a settling time used for collecting any sensor measurements. |
