Transmission and reception apparatus having a single phase-locked loop and method thereof

A transmission and reception apparatus for use in a radio communication system, said apparatus comprising:

• a modulation circuit having a first phase shifter for performing a signal modulating operation;
• a demodulation circuit having a second phase shifter for performing a signal demodulation operation;
• a reference signal generator for generating a reference signal for said radio communication system;
• a phase locked loop for locking said reference signal to a predetermined frequency;
• a signal generator for generating a signal in response to an output provided from said phase locked loop, and providing said signal to said first and second phase shifters in said modulation and demodulation circuits;
• a first frequency multiplier for multiplying said signal by a first predetermined value to generate a first multiplied signal;
• a first band pass filter for band pass filtering said first multiplied signal to generate a first filtered signal;
• a first amplifier for amplifying said first filtered signal to generate a first amplified signal, and providing said first amplified signal to an upconversion mixer;
• a second frequency multiplier for multiplying said signal by a second predetermined value to generate a second multiplied signal;
• a second band pass filter for band pass filtering said second multiplied signal to generate a second filtered signal;
• and
• a second amplifier for amplifying said second filtered signal to generate a second amplified signal, and providing said second amplified signal to a downconversion mixer.

A transmission and reception method for a radio communication system, comprising the steps of:

• generating a reference signal for said radio communication system;
• generating a phase locked signal by phase locking said reference signal to a predetermined frequency;
• generating a signal in dependence upon said phase locked signal, and providing said signal to phase shifters in modulation and demodulation circuits;
• multiplying said signal by a first predetermined value to generate a first multiplied signal;
• band pass filtering said first multiplied signal to generate a first filtered signal;
• amplifying said first filtered signal to generate a first amplified signal, and providing said first amplified signal to an upconversion mixer to enable signal transmission;
• multiplying said signal by a second predetermined value to generate a second multiplied signal;
• band pass filtering said second multiplied signal to generate a second filtered signal;
• and
• amplifying said second filtered signal to generate a second amplified signal, and providing said second amplified signal to a downconversion mixer to enable signal reception.