By Kimmo Koli
This "current-amplifier cookbook" comprises an intensive evaluation of other present amplifier topologies realisable with sleek CMOS integration applied sciences. The ebook derives the seldom-discussed factor of high-frequency distortion functionality for all reviewed amplifier topologies, utilizing as basic and intuitive mathematical tools as attainable.
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Additional info for CMOS Current Amplifiers: Speed versus Nonlinearity (The Springer International Series in Engineering and Computer Science)
More detailed examples of these circuits can be found in Chapters 6 and 7. One recent application for a CCI involves linearisation of MOS transistor transconductance in transconductance-C filters . Because the transconductance of a MOS transistor in triode region strongly depends on its drain-source voltage, a CCI can be used to force the drain voltage to a fixed potential and mirror the drain current to the high-impedance Z-output. 4a . The positive half of an AC-signal goes primarily through the lower conveyor constructed of transistors whereas in the case of the negative half of the signal goes primarily through the upper conveyor, constructed of transistors The quiescent current of the push-pull CMOS CCI is not easy to derive as it depends on several different mechanisms.
10] J. Mulder, A. van der Woerd, W. Serdin, A. van Roermund, “High-swing cascode MOS current mirror,” Electronics Letters, vol. 32, pp. 1251-1252, July 1996. References 44  E. Säckinger, W. Guggenbuhl, “A high-swing, high-impedance MOS cascode circuit” IEEE J. Solid State Circuits, vol. 25, pp. 289-298, Feb. 1990.  T. Serrano, B. Linares-Barranco, “The active-input regulated-cascode current mirror,” IEEE Trans. Circuits and Systems-I, vol. CAS-41, pp. 464-467, June 1994  A. Zeki, H.
2 Nonlinearity At low frequencies the drain conductance of the current source transistor converts the non-linear input voltage to a non-linear current and thus the low frequency second order harmonic distortion is and the third order harmonic distortion is consequently where m is the modulation index. 28) also predict the high frequency distortion of the current-buffer. Regardless, as this amplifier is not sensitive to device mismatch, the main buffer transistor can be a minimum channel length device and thus the distortion due to the input capacitance is not as big a problem as with the current-mirror.