Method of performing signal-measured calibration

Details Method of performing signal-measured calibration Method of performing signal-measured calibration

2008-07-09

2010-06-29

Nguyen, Vinh P (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

C324S715000

Reexamination Certificate

active

07746061

ABSTRACT:
This present invention discloses a method for performing an accurate calibration of signal measurement by a light-driving system including an automatic power control (APC) circuit which is pre-calibrated for a signal measurement process. By enlarging at least one measured pad of the APC circuit, multiple grounding paths are established via a plurality of probes of a test instrument. An impedance effect predicted on the contact between the probes and the pad is diminished greatly. A voltage value on the pad can be accurately measured. Thus, a reference voltage value input to a first input of a comparator of the APC circuit can be determined on a basis of a specific condition when a ramping voltage value input to a second input of the comparator is substantially equal to a sum of a predetermined reference voltage value and the voltage value of the pad.

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