Method and apparatus for evaluating and compensating nonlinearity error

摘要

In order to receive the continual time input signal, to output the digital output signal evaluation device 30 in order to evaluate the non-linear error of the converting circuit 10 like ADC which is formed, it is 30a-c. The continual time input signal band is limited by angular frequency band [ , ] basically, it is (L 1) /T here, is L /T, L is positive integer, T is sample period of the converting circuit. Evaluation device 30, 30a-c entry port 32 in order to receive the digital input signal to possess 1st sample rate 1/T, 32a-c and, output port 34 in order to output the digital is evaluated error signal which possesses 1st sample rate, possesses with 34a-c. Concerning each integer P_k in setting the integer, as for the evaluation device in order, 1st signal s (n) 1st linear filter device 100-k in order to be generated and, 1st to be higher than sample rate the coefficient the 2nd signal s which possesses the 2nd sample rate of L which is L R_k T P_k/ R_k (m) to be generated as a linear function of the digital input signal 1st signal s (n) interpolation device 105-k in order to interpolate and, (s (m))It possesses with the 2nd linear filter 115-k in order to generate the component of the error signal which is evaluated as 3rd signal s (m) non-linear device 110-k in order to be generated and, 3rd signal s (m) of on the basis, the component has 1st sample rate here. Furthermore, the evaluation device possesses the addition circuit 117 in order to generate the error signal which is evaluated as sum of the component of the error signal which is evaluated. Furthermore the compensating circuit which possesses the evaluation device (20), you evaluate and to compensate the manner which in order non-linearity error and corresponds, computer program product, reading possible media of the computer, also hardware description entity has been disclosed. Choice figure Drawing 5