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 to 10kHz are symmetry variable in five steps from 0.1 to 0.5. The last eight frequencies only managed to achieve symmetry variations 0.5 and 0.25. This is due to some limiting factor