US 12,442,857 B2
Error rate measurement apparatus and error rate measurement method
Hironori Yoshioka, Kanagawa (JP); and Tatsuya Iwai, Kanagawa (JP)
Assigned to ANRITSU CORPORATION, Kanagawa (JP)
Filed by ANRITSU CORPORATION, Kanagawa (JP)
Filed on Apr. 10, 2024, as Appl. No. 18/631,416.
Claims priority of application No. 2023-113793 (JP), filed on Jul. 11, 2023.
Prior Publication US 2025/0020718 A1, Jan. 16, 2025
Int. Cl. G01R 31/317 (2006.01); G01R 31/3185 (2006.01)
CPC G01R 31/3171 (2013.01) [G01R 31/318572 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An error rate measurement apparatus that measures an error rate of an input signal from a device under test, the error rate measurement apparatus comprising:
a processing unit that calculates a measurement time satisfying a target confidence level based on the target confidence level, a data rate of the input signal, a target error rate of the input signal, and an assumed number of errors E during the measurement time of the input signal,
wherein the processing unit includes
an average value calculation unit that calculates a sum x of a value obtained by dividing a variable min_x by 2 and a value obtained by dividing a variable max_x by 2,
a provisional confidence level calculation unit of calculating a provisional confidence level CLx based on the sum x according to the expression:

OG Complex Work Unit Math
an upper and lower limit value update unit that substitutes the sum x for the variable min_x in a case where the provisional confidence level CLx is equal to or lower than the target confidence level, and substitutes the sum x for the variable max_x in a case where the provisional confidence level CLx is higher than the target confidence level,
a convergence determination unit that determines whether or not changes in a value of the sum x calculated by the average value calculation unit are converged in a predetermined range, and
a measurement time calculation unit that calculates, in a case where the convergence determination unit determines the convergence, a value obtained by dividing the converged sum x by a product of the data rate and the target error rate, as the measurement time, and
the processing unit repeats processing of the average value calculation unit, the provisional confidence level calculation unit, and the upper and lower limit value update unit by using a latest variable min x and a latest variable max_x in a case where the convergence determination unit does not determine the convergence.