![periodic motion pulse periodic motion pulse](https://www.mdpi.com/sensors/sensors-19-00673/article_deploy/html/images/sensors-19-00673-g013.png)
Investigate the pulse distortion in the output signals when different rectangular pulse trains were used as input signals.The other method compared the shapes of the input and output pulses. One considered the frequency content of the input and output signals. The distortion in the resulting output signals were analyzed using two approaches. In this Lab Fact, different broadband, periodic rectangular pulse trains were input to a laser-based system with a 3 dB cutoff frequency of 750 kHz.
![periodic motion pulse periodic motion pulse](https://faculty.sites.iastate.edu/jgwang/files/inline-images/Bi2Se3.png)
When the bandwidth of the input signal is greater than the system's 3 dB bandwidth, the output signal can be expected to exhibit the effects of pulse distortion. It is not always possible, or desirable, to use a system whose response is fast enough to provide an undistorted output pulse. Systems are typically designed to minimize the distortion in the output signal when the input signal frequencies are within the system's specified bandwidth, which is a frequency range over which the system's response is optimal.
Periodic motion pulse driver#
The driver is expected to output a current signal that is a good representation of the input signal supplied by the function generator.
Periodic motion pulse generator#
An example is a system that includes a laser diode driver that accepts an input signal from a function generator and supplies a current signal to a laser diode. Pulse distortion can be a concern for any system intended to output a scaled version of an input signal. The distorted rectangular pulse will often have a rounded appearance, as illustrated in Figure 1. This effect is frequently seen when the input signal is a square wave or rectangular pulse train with a high repetition rate.
![periodic motion pulse periodic motion pulse](https://image1.slideserve.com/1830971/pulse-wave-vs-periodic-wave-l.jpg)
Distortion of pulses output by a system is expected when the bandwidth of the system is not sufficient to accommodate the bandwidth of the input signal. Pulse distortion is deformation of the ideal pulse profile, and it occurs in output signals when the system cannot respond as fast as the amplitude of the input signal changes. What 3 dB system bandwidth is required for rectangular output pulses?