Circuit for quickly estimating sensing value and method therefor

The invention discloses a circuit for quickly estimating a sensing value and a method therefor. The circuit comprises a first sensing unit, an integral sensing circuit and a quick estimating circuit. The fast estimation circuit comprises a clock generator, a second counter, a first digital comparator and an arithmetic module. The clock generator is configured to generate a clock signal having a first frequency. The second counter counts the clock signal within the integration time to generate a second count value. The first digital comparator determines whether the second count value exceeds a first predetermined count value when the first count value of the integral sensing circuit increases. The arithmetic module estimates the first count value at the end of the integration time according to the ratio of the second maximum count value to the second count value and the first count value when the second count value exceeds the first predetermined count value to generate an estimated count value result. 公开一种快速