Sigma Delta Modulator Tutorial. Figure 9 shows the block diagram for the modulator portion of the intersil hi7190 sigma delta adc. The main advantage of this filter is its notch response which for example can reject the line frequency when set at that frequency.
In sigma delta converters a widely used filter topology that performs the lowpass function is the sinc type figure 10. Delta sigma modulator is one of the best solutions for this data acquisition interface because the quantization noise is shaped out of band with a high pass characteristic and the decimation filtering can be combined with selective digital filtering and if mixing in order to attenuate both the quantization noise and neighboring blockers. For example a converter with a 2khz output data rate may have a modulator loop frequency of over 2 5mhz.
Summarythis paper presents a tutorial overview of continuous time delta sigma modulators ctdsm.
Summarythis paper presents a tutorial overview of continuous time delta sigma modulators ctdsm. The third integrator is shown in figure 10. Digital side of sigma delta modulator. Rev a 10 08 wk page 1 of 12 mt 022 tutorial adc architectures iii.
