Abstract
This paper discusses the large-signal harmonic distortion (HD) caused by channel-modulation (λ-effect) on four elementary MOS current mirror (CM) configurations. The third-order equation that relates the incremental gate-source voltage to signal current in CM input transistor is conveniently simplified into a simpler quadratic dependence, so that a tractable expression for the output current is obtained, and therefore, closed-form formulae for HD 2 and HD 3 . The study is supported in good conformity by a set of comparisons between data of HD 2 and HD 3 from a numerical FFT of the cubic equation and those from simplified expressions. HD is calculated in function of circuit and transistor parameters, providing a deep insight for the choice of CM that best trades off layout area and power consumption to meet a distortion level. A comparative HD analysis from distinct current mirrors is also provided. Among the configurations investigated, the high-swing CM presents better linearity, with HD 2 below 0.05% across the range of analysis.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
