A Nonlinear Macromodel for CMOS OTAs
نویسندگان
چکیده
A nonlinear parameterizable macromodel fo r CMOS Operational Transconductance Amplijiers (OTAs) is presented. The macromodel captures the DC, AC and large signal features of the transistor level original circuit, thus modeling accurately its time domain and nonlinear performance. The main contribution of this work is to account for the bias-dependent transconductance nonlinearities in the circuit, by curve-jilting the desired output characteristics with ndimensional polynomials. The model can also account for the nonlinear dependence ofthe circuit S churucteristics on several design parameters. The applicability of the model is demonstrated by modeling the response of an OTA-Cfiltet:
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