The "Nonideal" Drain-Loaded Source-Follower And Accurate Differential-Amplifier Analysis

This paper presents an elegant technique for the mid-band analysis of a "nonideal" drain-loaded source-follower. The analysis of the drain-loaded source-follower is then applied to the superposition-based mismatch differential-gain analysis of a differential amplifier. This novel technique provides a more comprehensive mismatch gain analysis of the differential amplifier compared to that available in text books and other published sources. The presented analysis of a "nonideal" drain-loaded source-follower has not been reported before in open literature in any form. This new method renders the need for the well-known and commonly employed "voltage-divider" form of the source-follower analysis unnecessary. A more accurate differential-amplifier mismatch gain expression is attained using a much simpler source-follower mid-band analysis technique.