This paper estimates approximately and sheds light in an insightful way upon the impact of the basic bipolar process parameters upon harmonic distortion for the log-domain lossy integrator case. A step-by-step, symbolic, transistor-level distortion calculation is elaborated. The determination of the harmonic distortion levels present at the integrator's output is based upon the exploitation on the medium complexity Charge-Control-Model (CCM) for the Bipolar Junction Transistor (BJT). Results correlating the input signal strength with the impact of basic BJT non-idealities (e.g. finite beta values, parasitic base and emitter resistances) upon the output linearity levels are provided.