Analysis and compensation of transistor non-idealities in log-domain wave active filters

A very important issue concerning the implementation of log-domain filters in integrated form is the effect of BJT transistor non-idealities. This paper is dealing with the above practical problem in the design of log-domain wave filters. For this purpose, a detailed analysis of the effects of the non-idealities on the frequency behavior of log-domain wave active filters is performed. In addition, a systematic method for compensating the caused imperfections is introduced. The validity of the proposed compensation scheme has been verified through simulation results.