Patent ID: 7148743
Filing Date: 2006-12-12
Classification: H04L

Abstract:
1. A demodulation device having a demodulation stage that receives an input signal that is modulated, the demodulation device comprising: a first power control circuit of the demodulation stage, the first power control circuit receiving the input signal of the demodulation stage, and keeping the amplitude of the input signal constant for slow fluctuations in the amplitude of the carrier; a plurality of demodulation circuits coupled in series on the output side of the first power control circuit, the demodulation circuits receiving the input signal of the demodulation stage and applying a demodulation processing to the input signal; a second power control circuit of the demodulation stage, the second power control circuit receiving the input signal of the demodulation stage, and generating a control signal having at least two states that include a signal present state representing detection of the presence of the input signal and a signal disappeared state representing detection of the disappearance of the input signal; and first means that receives the control signal generated by the second power control circuit, the first means deactivating the demodulation circuits when the control signal changes from the signal present state to the signal disappeared state so as to prevent the demodulation circuits from becoming desynchronized, and activating the demodulation circuits when the control signal changes from the signal disappeared state to the signal present state so as to enable a fast restart of the demodulation processing.