In this example, the Chirp block outputs a unidirectional, linearly swept chirp signal. The Time Scope displays the signal output in the time domain and the Spectrum Analyzer displays the spectrogram in the frequency domain.
To obtain a unidirectional sweep with known initial and final frequency values, in the Chirp block set the Target time equal to Sweep time. In which case, the Target frequency becomes the final frequency in the sweep. Since the Target time is set to equal Sweep time (1 second), the Target frequency (25 Hz) is the final frequency of the unidirectional sweep. This technique might not work for swept cosine sweeps. For details, see the Frequency sweep described for the Frequency sweep parameter.
Run the model to see the time domain output: