| 摘要 |
Polarity independent precision measurement of an input voltage signal is accomplished using a voltage integrating circuit that receives a first positive reference voltage and the input voltage signal, wherein the first positive reference voltage is greater in magnitude than the input voltage signal. A resetting circuit is coupled to the voltage integrating circuit for stabilizing its output. A pair of comparators, each connected to the output of the voltage integrating circuit, make voltage comparisons against a second reference voltage and a third reference voltage respectively, wherein the second and third reference voltages are greater in magnitude than the first reference voltage. A time interval measurement circuit receives the outputs of the pair of comparators, and operates to measure the time taken for the output of the voltage integrating circuit to transit to the second reference voltage level and the third reference voltage level. The time interval measurement circuit provides an output for controlling the resetting circuit.
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