Transmission and reception apparatus having a single phase-locked loop and method thereof
First Claim
1. A transmission and reception apparatus for use in a radio communication system having an upconversion mixer, a downconversion mixer, a modulation circuit including a distributor, first mixers and a first phase shifter and a demodulation circuit including a combiner, second mixers and a second phase shifter, said apparatus comprising:
- 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 supplying 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 said 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 said downconversion mixer.
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Accused Products
Abstract
A transmission and reception method and apparatus is capable of supplying local oscillation frequencies for upconversion and downconversion, as well as carrier frequencies for modulation and demodulation by utilizing only one local oscillator. The apparatus includes a reference signal generator for generating a reference signal, and a phase locked loop for locking the output of the reference signal generator to a predetermined frequency. A signal generator generates a signal in response to the output provided from the phase locked loop, and provides the signal to phase shifters in modulation and demodulation circuits. A first frequency multiplier multiplies the output of the signal generator, a first band pass filter band pass filters the output of the first frequency multiplier, and a first amplifier amplifies the output of the first band pass filter and provides the amplified result to an upconversion mixer. A second frequency multiplier multiplies the output of the signal generator, a second band pass filter band pass filters the output of the second frequency multiplier, and a second amplifier amplifies the output of the second band pass filter and provides the amplified result to a downconversion mixer.
290 Citations
14 Claims
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1. A transmission and reception apparatus for use in a radio communication system having an upconversion mixer, a downconversion mixer, a modulation circuit including a distributor, first mixers and a first phase shifter and a demodulation circuit including a combiner, second mixers and a second phase shifter, said apparatus comprising:
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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 supplying 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 said 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 said downconversion mixer. - View Dependent Claims (2)
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3. A transmission and reception apparatus for use in a radio communication system, said apparatus comprising:
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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. - View Dependent Claims (4, 5, 6, 7, 8)
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9. A transmission and reception method for a radio communication system, comprising the steps of:
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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. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification