Contents
How to generate an arbitrary waveform from a periodic ramp signal?
There are two fundamental ideas of DDS technology: Generating an arbitrary periodic waveform from a periodic ramp signal. Generating a digital ramp. Let’s first look at generating an arbitrary periodic waveform from a periodic ramp signal. In the following, to keep things simple, we will only use times t ≥ 0.
Which is the guidebook for arbitrary waveform generators?
This guidebook is useful to those with little knowledge of function generators, as well as the experienced technician or engineer who wishes to refresh his/her memory or explore new uses for function generators and more sophisticated arbitrary waveform generators. First, we will explain the controls of a typical function generator.
How to calculate the periodicity of a signal?
0. Consider the discrete-time signal obtained by taking equally spaced samples of x(t) – that is, x[n] = x(nT) = ej! 0nT (a)Show that x[n] is periodic if and only if T=T 0is a rational number – that is, if and only if some multiple of the sampling interval exactly equals a multiple of the period of x(t).
How is the amplitude of a DDS generator determined?
DDS function generators may have the ability to let the user set the amplitude using the peak-to-peak voltage or the RMS voltage. Some generators let the user set the amplitude in dBm, which represents a power of 1 mW.
How to adjust the frequency of a waveform generator?
Adjusts the duty cycle or symmetry of the displayed waveform. Turns the frequency sweep mode on and off and allows selection of a linear sweep or logarithmic sweep. After pressing this button, the adjustment knob (control 2) will adjust the output signal’s frequency.
Is the RMS voltage of a square wave the same as its amplitude?
The RMS voltage for the square wave is the same (an easy way to see this is to take the negative-going portion and flip it about the horizontal axis; this is allowed as far as its heating ability is concerned). The peak-to-peak voltage is, again, twice the amplitude voltage and in this case equivalent to twice the RMS voltage.