Patent ID: 7239846
Filing Date: 2007-07-03
Classification: H04B

Abstract:
1. An up-conversion modulation loop for multi-mode mobile communication being used to perform signal modulation and processing so as to transmit the signal by using a single power emitter, the loop comprising: a phase modulator for receiving a feedback signal and a modulation phase signal, and comparing the two signal so as to generate a difference; a first filter for receiving the difference generated by the phase modulator, and transmitting it to a frequency divider; a first frequency divider for receiving the signal transmitted by the first filter so as to perform the signal down-conversion, and transmitting the signal to a phase frequency comparator; a phase frequency comparator for receiving the signal transmitted by the first frequency divider and a second down-conversion signal so as to compare the signal phases, and transmitting the signal to a loop low-pass filter; a loop low-pass filter for receiving the signal transmitted by the phase frequency comparator so as to perform the signal filtering, and transmitting the signal to a second adder; a second adder for receiving the signals transmitted by the loop low-pass filter and a signal amplifier so as to synthesize the signals, and transmitting the synthesized signal to a voltage controlled oscillator; a voltage controlled oscillator for receiving the signal transmitted by the second adder so as to perform the signal modulation and make the phases of the input signal and the output signal consistent, and outputting the signal to a power amplifier for signal emitting; a phase detector for receiving the modulation phase signal so as to detect the signal phase; a signal amplifier for receiving the detection signal transmitted by the phase detector and the signal outputted by a signal transmitter so as to perform the signal amplifying, and transmitting the amplified signal to the second adder; a signal transmitter for receiving the difference transmitted by the phase modulator, and transmitting it to the signal amplifier; wherein the multi-mode signal modulation is accomplished and the modulated signal is transmitted to the next level processing unit for signal emission.