CMOS Current Amplifiers: Speed versus Nonlinearity (The by Kimmo Koli

By Kimmo Koli

This "current-amplifier cookbook" includes an in depth overview of alternative present amplifier topologies realisable with smooth CMOS integration applied sciences. The ebook derives the seldom-discussed factor of high-frequency distortion functionality for all reviewed amplifier topologies, utilizing as uncomplicated and intuitive mathematical equipment as attainable.

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Additional info for CMOS Current Amplifiers: Speed versus Nonlinearity (The Springer International Series in Engineering and Computer Science)

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Roberts, “High-swing MOS current mirror with arbitrarily high output resistance,” Electronics Letters, vol. 28, pp. 361-362, Feb. 1992. [6] D. Haigh, C. Losala, A. Parker, D. ” In: H. , 1993, pp. 3-74 (Part I). [7] D. Webster, D. Haigh, G. Passiopoulos, A. Parker, “Distortion in short channel FET circuits,” In: G. 929-958 (Chapter 24). [8] R. Balmford, W. Redman-White, “A new CMOS current mirror circuit with reduced distortion for high bandwidth applications,” European Conference on Circuits Design and Theory (ECCTD’93), Davos, Switzerland, 1993, pp.

17a is a simple NMOS common-gate amplifier stage. In order to keep the transistor in saturation the out- put DC-voltage level must be at least In certain applications, it is impossible to maintain these bias conditions and therefore we need a voltage level shifter either at the input or at the output. 17b. This current buffer resembles a simple current-mirror, except that the mirror transistor sources are connected to a high impedance node (current-source) rather than a low impedance node (negative supply voltage).

1 Current-mirror 21 generate distortion in the same way as the input capacitance rents and However, the cur- cancel each other out because the parasitic capacitances at the mirror drain nodes, in addition to the cascode transistor transconductances, are well matched. Therefore, the same output current equation is also valid for the low voltage cascode current-mirror. At signal frequencies significantly lower than the mirror pole frequency it can be assumed that the current flowing through the gate capacitance is merely a fraction of the input current, so that it does not affect the mirror input voltage As the gate-source capacitance is relatively linear in the saturation region, it can be assumed that the derivative of the mirror input voltage is the only non-linear ele- ment of the large signal current equation.

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