Double sampled sigma delta modulator of second order having a semi-bilinear architecture

摘要

A second-order double-sampled analog/digital SIGMA DELTA converter uses two fully differential switched-capacitors integrators coupled in cascade; the first integrator has a fully-floating double-sampled, bilinear switched capacitor input structure, whereas the second integrator has a double-sampled linear switched-capacitor input structure, achieving an excellent SNR with a reduced number of switches for a low consumption. <IMAGE>