TWO-POINT MODULATOR COMPRISING A PLL CIRCUIT AND A SIMPLIFIED DIGITAL PRE-FILTERING SYSTEM

摘要

The invention relates to a two-point modulator (1) comprising a PLL circuit (2). Said two-point modulator (1) comprises a first circuit branch for injecting an analog modulation signal (17) into a first point of the PLL circuit (2), and a second circuit branch for injecting a digital modulation signal (16) into a second point of the PLL circuit (2). The second circuit branch controls a frequency distributor (9) in the feedback branch of the PLL circuit (2) and contains a digital filter (10) having a rectangular impulse response.