FM modulator using both quadrature phase modulator and the phase-locked loop

摘要

(57) I will disclose the conversion loop modulator of the transmitter circuit in [summary] communication system. Converter loop modulator includes a modulator input for receiving an input signal representing at least one information modulated. The input modulation device generates an intermediate modulation signal by receiving a feedback signal responsive to the feedback signal and the input signal. The modulator includes a comparator for generating an output transmission signal by receiving the reference signal and the intermodulation signal, responsive to the reference signal and the intermodulation signal. The modulator I comprises a feedback circuit connected to the reference signal and output a transmission signal. The feedback circuit generates a feedback signal that is also connected to the input modulator, responsive to the reference signal and the output transmission signal.