SIGMA-DELTA LOADING LOOP AND MODULATOR COMPRISING SUCH A LOADING LOOP.

摘要

This control loop (12) comprises an inlet (15) and an exit (18) connected to one another by a direct link (20) and a reaction against - (26). The servo-control loop (12) comprises, in addition, a filtering unit (30) which comprises at least one filtering device (40a, 40b, 40c, 40d) connected between the direct link (20) and a reference voltage (m). Each filtering device forms a - band pass filter centered on a central frequency (fc) predetermined. Each filtering device (40a, 40b, 40c, 40d) comprises, in addition, a connection of the connection (1a, 1b, 1c, 1d) forming an electrical transmission line extending between the direct link (20) and the reference voltage (m), the length of each link of the connection (1a, 1b, 1c, 1d) being approximately equal to, where n is an odd integer and v is the speed of propagation of a signal circulating in the connection of the connection (1a, 1b, 1c, 1d).