Digital Block for a Fucntion Generator

Digital Block Design Design introduction The Digital Block is the heart of this digitally controlled function generator. Symmetry and frequency variation is direct result of the design of this block. In this design the emphasis was on simplicity and some target specifications at the top of the frequency variation were compromised in order to achieve greater simplicity. This design achieves 28 frequencies in the range of 100Hz to 100kHz. Whilst the 17 frequencies from the range 100Hz …

…Variation Module The function of this module is simply to take an input clock signal and split it and divide the two by different MOD numbers. However the selection of these numbers is critical to the achieved symmetry as well as the frequency accuracy. Therefore we shall now look again at the target specifications. For a waveform with a symmetry of t/T=0.1, the down clock must be 9 times as fast as the up clock.