Abstract
This paper describes analysis of nonlinear effects in a MOS transistor operating in moderate inversion and saturation. The dependence of the drain current on the gate-source and drain-source voltages is described using a modified version of the 'reconciliation' model developed by Y. Tsividis. In the new model, the current components, which correspond to the terms depending exponentially on normalized gate-source or drain-source modulating sinusoidal voltages, are presented using modified Bessel functions. This approach allows one to find the first, second, and third harmonics of the drain current caused by the gate-source or drain-source voltage sinusoidal modulation and find also the intermodulation terms produced by these two modulating voltages. The results are applied to set the requirements to the gate-source and drain-source bias voltages in design of low-distortion and/or low-voltage amplifiers. It is shown that the realization of the stage with the zero value of third-order harmonic requires extremely tight tolerances for the threshold voltage. The suppression of intermodulation terms requires increased drain-source voltage. These recommendations are confirmed by simulations.
Original language | English |
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Article number | 8602361 |
Pages (from-to) | 1897-1907 |
Number of pages | 11 |
Journal | IEEE Transactions on Circuits and Systems I: Regular Papers |
Volume | 66 |
Issue number | 5 |
DOIs | |
Publication status | Published - 1 May 2019 |
Keywords
- drain current harmonics
- low-distortion/low-voltage amplifier
- moderate inversion
- MOS transistor model
- saturation