The stability of active switched capacitor double-integrator filters is found to be signal-dependent, especially at high pole-frequencies and at high quality-factors. Making use of a macromodel representing the operational amplifier (op-amp) signal-dependent nonlinearity, the output signal-level at which the filter locks into large-signal oscillation is estimated. From an equivalent circuit for the switched-capacitor biquad, an expression for the frequency of this large-signal oscillation is derived. Theoretical and experimental results associated with this large-signal instability problem are reported for switched-capacitor filters using bipolar-input and FET-input op-amps. Results of investigations carried out on a compensated biquad are given.