Dynamic modeling of tunable analog integrated filters for a stability study of on-chip automatic tuning loops

摘要: Continuous-time filters with automatic tuning loops are nonlinear feedback systems that potentially unstable. To ensure stability, particularly if the design of loop controllers is to be improved, appropriate linear dynamic modeling tunable filter, including control inputs, should attained. This work aims present a general continuous-time analog capability. The analysis leads an equivalent small-signal linearized incremental model, from which transfer functions between output variables and voltages obtained. Subsequent analysis, it possible compensated enhanced stability performance. By way example, particular band-pass CMOS filter presented in this paper. Two derived: function phase shift central frequency voltage, amplitude quality factor voltage. These required properly tune parameters. makes propose adaptive controller improved implementation for such controller. Finally, experimental results shown 0.8 μm technology.