A State-Space Approach to Intermodulation Distortion Estimation in Fully Balanced Bandpass $G_{m}$– $C$ Filters With Weak Nonlinearities

摘要

A state-space approach to estimating intermodulation distortion in bandpass $G_{m}$–$C$ filters with fully balanced, weakly nonlinear transconductors is introduced. It results in compact analytic expressions applicable to $G_{m}$–$C$ filters of any order. For verifying the theory, two $G_{m}$–$C$ filters with fully balanced weakly nonlinear transconductors have been designed using Cadence. They have been simulated in SpectreS as well as modeled and simulated in Simulink. Theory and simulation results are found in good agreement.