Download CMOS Current Amplifiers Speed versus Nonlinearity by Kimmo Koli PDF

By Kimmo Koli

Meant as a current-amplifier cmos containing an intensive evaluate of other present amplifier topologies with integration applied sciences.

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Extra resources for CMOS Current Amplifiers Speed versus Nonlinearity

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If cascode transistors have the same dimension as Basic current amplifiers 30 the mirror transistors also the MOS-capacitor should preferably have the same dimensions, but because of the bulk effect, the minimum distortion is reached with an aspect ratio of The comparison of the simulated distortions shows that the enhanced Wilson currentmirror has significantly better distortion performance below At higher frequencies, this topology has similar distortion performance to the uncompensated low voltage current-mirror.

The capacitance integrates the input current forming the mirror input voltage. The mirror input voltage is then amplified by the transistor transconductance into a nonlinear drain current. The diode-connected input transistor forms the feedback alone so that, for the distortion equations, the feedback factor is always one regardless of current mirroring ratio. 28). 27) when Therefore the simple equations agree with the more complex feedback equations. 6. In the simulations the Level 2 Spice-models of a and CMOS-process were used and the aspect ratio of the mirror transistors was A threshold voltage mismatch of 5 mV was assumed and the saturation voltage of the mirror transistors was approximately 300 mV.

1998. [17] T. Voo, C. Toumazou, “High-speed current mirror resistive compensation technique,” Electronics Letters, vol. 31, pp. 248-250, Feb. 1995. [18] T. Voo, C. Toumazou, “Precision temperature stabilized tunable CMOS currentmirror for filter applications,” Electronics Letters,” vol. 32, pp. 105-106, Jan. 1996. [19] B. Kamath, R. Meyer, P. Gray, “Relationship between frequency response and settling time of operational amplifiers,” IEEE J. Solid-State Circuits, vol. SC-9, pp. 347-352, Dec. 1974.

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