Now this may seem like just a bunch of trig trickery, but quadrature modulation is normally implemented in a system with a block diagram shown in Figure 2. Figure 2 A quadrature modulator uses sine ...

Figure 1 shows the block diagram of an isolated sigma delta acquisition system. Figure 1 Optically Isolated Sigma Delta Modulator block diagram There are a couple of advantages with such approach.

In this application the modulation scheme targets Altera’s Cyclone-IV FPGA populated on a DE2-115 development board from Terasic and an HSMC (High Speed Mezzanine Card). A system block diagram shows ...