Patent ID: 7643572
Filing Date: 2010-01-05
Classification: H04L

Abstract:
1. A modulator for a transmitter for a digital communication system, the modulator comprising: a phase locked loop with a reference frequency input, a modulation input for modulation of the phase locked loop, and an output for outputting a modulated signal, wherein a bandwidth of a transfer function between a modulated signal and a signal at the modulation input is variable, a means for determination of a first signal, which is characteristic of a modulation shift of the modulated signal, a means for provision of a second signal, which is characteristic of a nominal modulation shift, a comparison means for comparison of the first signal with the second signal, and a means for variation of the bandwidth as a function of the output signal from the comparison means wherein the means for variation of the bandwidth comprise a digital having a transfer function corresponding to the transfer function of a PI regulator, wherein the I-component of the PI regulator is provided by an accumulator with feedback.