Radio equipment communicatable in two frequency bands and method for generating local oscillator signal in radio equipment
View Patent ↗Radio equipment enabling radio communication with frequency conversion corresponding to signals of different frequency bands is disclosed. A local oscillator signal generator included in this radio equipment having a first signal generator, a second signal generator, and a frequency synthesizer generating a local oscillator signal. A first signal having first frequency is generated in the first signal generator, and a second signal having second frequency smaller than the first frequency is generated in the second signal generator. These first and second signals are synthesized, and the local oscillator signal either having the frequency derived from adding the second frequency to the first frequency, or having the frequency derived from subtracting the second frequency from the first frequency is generated.
1. A radio equipment generating a signal of a first frequency band by frequency-converting using a signal of a third frequency band, and generating a signal of a second frequency band by frequency-converting using a signal of a fourth frequency band, thereby enabling transmitting which ever signals of the first frequency band and the second frequency band to other radio equipment, said radio equipment comprising:
a first output section outputting a signal of a predetermined frequency belonging to a band lying between the third frequency band and the fourth frequency band;
a second output section outputting a signal of a predetermined frequency; and
a generation and output section generating and outputting, using the signals from the first output section and the second output section, a signal having a frequency equal to the frequency sum of the signals from the first and second output sections, or a signal having a frequency equal to the frequency difference between the signals from the first and the second output sections, respectively as the signal of the third frequency band and the signal of the fourth frequency band.
2. A radio equipment converting a signal frequency of a first frequency band using a signal of a third frequency band, and converting a signal frequency of a second frequency band using a signal of a fourth frequency band, thereby enabling reception of whichever signals of the first frequency band and the second frequency band transmitted from other radio equipment, said radio equipment comprising:
a first output section outputting a signal of a predetermined frequency belonging to a band lying between the third frequency band and the fourth frequency band;
a second output section outputting a signal of a predetermined frequency; and
a generation and output section generating and outputting, using the signals from the first output section and the second output section, a signal having a frequency equal to the frequency sum of the signals from the first and second output sections, or a signal having a frequency equal to the frequency difference between the signals from the first and the second output sections, respectively as the signal of the third frequency band and the signal of the fourth frequency band.