OTA based frequency tuning system with reduced effect of DC offsets

An on-line tuning system based on the master–slave technique is proposed in this paper. Each stage of the system is realized by employing only operational transconductance amplifiers (OTAs). The most significant advantage of the introduced topology is the reduction of the influence of the dc offset terms which are critical about the performance of such systems. In addition, an attractive benefit is the suitability for implementing the resulted configurations in both integrated and discrete-component forms using only the same type of active element. The validation of the proposed topology is achieved through simulation and experimental results.