The forced oscillation technique (FOT) is a noninvasive method to determine respiratory mechanics by superimposing small amplitude (in the order of 0.1kPa) pressure oscillations on normal breathing. In the current state-of-the-art instrumentation, the measured frequencies are way higher than the breathing frequency. However, it has been shown that a lot of useful information is contained in the frequency range of spontaneous breathing (0.1 ? 1 Hz). A setup is proposed which allows to excite the respiratory mechanics at frequencies around the spontaneous breathing rate. However, the (nonlinear) dynamic behavior of the system and the pressure perturbations introduced by the subjects breathing jeopardize the spectral analysis of the measurement. Therefore a combination of pre-compensation of the excitation signal, run-time feedback control and post processing are applied and discussed using measurements on a prototype device.