Novel Bandpass-Biquad Evaluation Model for Computer-Based Compensation of an OTA-C Filter

The novel mathematical bandpass-biquad evaluation model based on poles/zeroes location for computer-based compensation of an OTA-C filter is proposed. In proving of model´s validation, the SA algorithm is utilized for searching a compensated circuit´s parameters of the most compact version of bandpass OTA-based TT biquad, which is not suitable for classical compensation methods of OTA´s nonidealities. A CMOS OTA with non-linear transconductance and low output resistance is chosen as the based OTA for the tested circuit. Through experiments, the proposed pole-zero-based model is proved very suitable for computer-based evaluation of bandpass biquad in compensation process. The comparing experiment is also conducted to measure the performances of the proposed and the existed model. The results provide a conclusion that the proposed model is superior in the requirement of computing power, and the evaluation ability for compensation process.