Radio communication apparatus

Claim 2

A radio communication apparatus which receives a first RF signal in a first communication band or a second RF signal in a second communication band, comprising: first local oscillation signal generation means for generating a local oscillation signal at a variable frequency and outputting said local oscillation signal as a first local oscillation signal; second local oscillation signal generation means for generating a local oscillation signal at a predetermined frequency; local oscillation frequency conversion means for performing frequency conversion on said first local oscillation signal by mixing said first local oscillation signal with the local oscillation signal generated by said second local oscillation signal generation means and for outputting the result of the conversion as a second local oscillation signal; first frequency conversion means for down-converting the received first RF signal into a communication signal by mixing the received first RF signal with the first local oscillation signal; and second frequency conversion means for down-converting the received second RF signal into the communication signal by mixing the received second RF signal with the second local oscillation signal.

Claim 3

The radio communication apparatus according to claim 1 , wherein said second local oscillation signal generation means is means for generating a local oscillation signal used for demodulation of the communication signal.

Claim 4

The radio communication apparatus according to claim 2 , wherein said second local oscillation signal generation means comprises: an oscillator; and third frequency conversion means for multiplying the frequency of a signal output by said oscillator by N (N>0) and for setting the multiplied signal as the local oscillation signal at the predetermined frequency.

Claim 5

The radio communication apparatus according to claim 2 , wherein said second local oscillation signal generation means comprises: first and second oscillators; third frequency conversion means for multiplying the frequency of a signal output by said first oscillator by N (N>0); and switch means for selectively outputting a signal output by said third frequency conversion means and a signal output by said second oscillator and for setting the outputted signal as the local oscillation signal at the predetermined frequency.

Claim 6

The radio communication apparatus according to claim 2 , wherein said second local oscillation signal generation means comprises: first and second oscillators; third frequency conversion means for multiplying the frequency of a signal output by said first oscillator by N (N>0); fourth frequency conversion means for multiplying the frequency of a signal output by said second oscillator by M (M>0); and switch means for selectively outputting a signal output by said third frequency conversion means and a signal output by said fourth frequency conversion means and for setting the outputted signal as the local oscillation signal at the predetermined frequency.

Claim 7

A radio communication apparatus which performs communication using at least either a first communication band used for a first radio communication system or a second communication band used for a second communication system, comprising: first local oscillation signal generation means for generating a local oscillation signal at a variable frequency and outputting said local oscillation signal as a first local oscillation signal; second local oscillation signal generation means for generating a local oscillation signal at a predetermined frequency; local oscillation frequency conversion means for performing frequency conversion on said first local oscillation signal by mixing said first local oscillation signal with the local oscillation signal generated by said second local oscillation signal generation means and for outputting the result of the conversion as a second local oscillation signal; first frequency conversion means for up-converting a communication signal into a first RF signal in the first communication band by mixing the communication signal with the first local oscillation signal; and second frequency conversion means for up-converting the communication signal into a second RF signal in the second communication band by mixing the communication signal with the second local oscillation signal.

Claim 8

A radio communication apparatus which performs communication using at least either a first communication band used for a first radio communication system or a second communication band used for a second communication system, comprising: first local oscillation signal generation means for generating a local oscillation signal at a variable frequency and outputting said local oscillation signal as a first local oscillation signal; second local oscillation signal generation means for generating a local oscillation signal at a predetermined frequency; local oscillation frequency conversion means for performing frequency conversion on said first local oscillation signal by mixing said first local oscillation signal with the local oscillation signal generated by said second local oscillation signal generation means and for outputting the result of the conversion as a second local oscillation signal; first frequency conversion means for up-converting a communication signal into a first RF signal in the first communication band by mixing the communication signal with the first local oscillation signal; and second frequency conversion means for up-converting the communication signal into a second RF signal in the second communication band by mixing the communication signal with the second local oscillation signal.

Claim 9

The radio communication apparatus according to claim 6 , wherein said second local oscillation signal generation means is means for generating a local oscillation signal used for modulation of the communication signal.

Claim 10

The radio communication apparatus according to claim 7 , wherein said second local oscillation signal generation means comprises: an oscillator; and third frequency conversion means for multiplying the frequency of a signal output by said oscillator by N (N>0) and for setting the multiplied signal as the local oscillation signal at the predetermined frequency.

Claim 11

The radio communication apparatus according to claim 7 , wherein said second local oscillation signal generation means comprises: first and second oscillators; third frequency conversion means for multiplying the frequency of a signal output by said first oscillator by N (N>0); and switch means for selectively outputting a signal output by said third frequency conversion means and a signal output by said second oscillator and for setting the outputted signal as the local oscillation signal at the predetermined frequency.

Claim 12

The radio communication apparatus according to claim 7 , wherein said second local oscillation signal generation means comprises: first and second oscillators; third frequency conversion means for multiplying the frequency of a signal output by said first oscillator by N (N>0); fourth frequency conversion means for multiplying the frequency of a signal output by said second oscillator by M (M>0); and switch means for selectively outputting a signal output by said third frequency conversion means and a signal output by said fourth frequency conversion means and for setting the outputted signal as the local oscillation signal at the predetermined frequency.

Claim 13

The radio communication apparatus according to claim 1 or 6 , wherein said local oscillation frequency conversion means comprise: mixing means for mixing said first local oscillation signal with the local oscillation signal generated by said second local oscillation generation means; and filter means for outputting high frequency sideband components from among high frequency side-band components and low frequency side-band components output based on the result of mixing by said mixing means as said second local oscillation signal.

Claim 14

The radio communication apparatus according to claim 1 or 6 , wherein said local oscillation frequency conversion means comprise: mixing means for mixing said first local oscillation signal with the local oscillation signal generated by said second local oscillation generation means; and filter means for outputting low frequency side-band components from among high frequency side-band components and low frequency side-band components output based on the result of mixing by said mixing means as said second local oscillation signal.

Claim 15

The radio communication apparatus according to claim 1 or 6 , further comprising: control means for selecting one of the first and second communication bands and generating a frequency instruction signal including the selected communication band; wherein a frequency of the first local oscillation signal is determined based on the generated frequency instruction signal.

Claim 16

A radio communication apparatus which receives a first RF signal in either a first communication band or a second RF signal in a second communication band, comprising: first local oscillation signal generation means for generating a first local oscillation signal at a variable frequency; second local oscillation signal generation means for generating a second local oscillation signal at a predetermined frequency; local oscillation frequency conversion means for performing frequency conversion on the first local oscillation signal by mixing the first local oscillation signal with the second local oscillation signal; first filter means for outputting low frequency side-band components, as a third local oscillation signal, from among high frequency side-band components and low frequency side-band components output as a result of the conversion at said local oscillation frequency conversion means; second filter means for outputting high frequency side-band components, as a fourth local oscillation signal, from among high frequency side-band components and low frequency side-band components output as a result of the conversion at said local oscillation frequency conversion means; first frequency conversion means for down-converting the received first RF signal into a communication signal by mixing the received first RF signal with the third local oscillation signal; and second frequency conversion means for down-converting the received second RF signal into the communication signal by mixing the received second RF signal with the fourth local oscillation signal.

Claim 17

A radio communication apparatus which receives a first RF signal in either a first communication band or a second RF signal in a second communication band, comprising: first local oscillation signal generation means for generating a first local oscillation signal at a variable frequency; second local oscillation signal generation means for generating a second local oscillation signal at a predetermined frequency; local oscillation frequency conversion means for performing frequency conversion on the first local oscillation signal by mixing the first local oscillation signal with the second local oscillation signal; first filter means for outputting low frequency side-band components, as a third local oscillation signal, from among high frequency side-band components and low frequency side-band components output as a result of the conversion at said local oscillation frequency conversion means; second filter means for outputting high frequency side-band components, as a fourth local oscillation signal, from among high frequency side-band components and low frequency side-band components output as a result of the conversion at said local oscillation frequency conversion means; first frequency conversion means for down-converting the received first RF signal into a communication signal by mixing the received first RF signal with the third local oscillation signal; and second frequency conversion means for down-converting the received second RF signal into the communication signal by mixing the received second RF signal with the fourth local oscillation signal.

Claim 18

The radio communication apparatus according to claim 14 , wherein said second local oscillation signal generation means is means for generating a local oscillation signal used for demodulation of the communication signal.

Claim 19

The radio communication apparatus according to claim 15 , wherein said second local oscillation signal generation means comprises: an oscillator; and third frequency conversion means for multiplying the frequency of a signal output by said oscillator by N (N>0) and for setting the multiplied signal as the local oscillation signal at the predetermined frequency.

Claim 20

The radio communication apparatus according to claim 15 , wherein said second local oscillation signal generation means comprises: first and second oscillators; third frequency conversion means for multiplying the frequency of a signal output by said first oscillator by N (N>0); and switch means for selectively outputting a signal output by said third frequency conversion means and a signal output by said second oscillator and for setting the outputted signal as the local oscillation signal at the predetermined frequency.

Claim 21

The radio communication apparatus according to claim 15 , wherein said second local oscillation signal generation means comprises: first and second oscillators; third frequency conversion means for multiplying the frequency of a signal output by said first oscillator by N (N>0); fourth frequency conversion means for multiplying the frequency of a signal output by said second oscillator by M (M>0); and switch means for selectively outputting a signal output by said third frequency conversion means and a signal output by said fourth frequency conversion means and for setting the outputted signal as the local oscillation signal at the predetermined frequency.

Claim 22

A radio communication apparatus which performs communication using at least either a first communication band used for a first radio communication system or a second communication band used for a second communication system, comprising: first local oscillation signal generation means for generating a first local oscillation signal at a variable frequency; second local oscillation signal generation means for generating a second local oscillation signal at a predetermined frequency; local oscillation frequency conversion means for performing frequency conversion on the first local oscillation signal by mixing the first local oscillation signal with the second local oscillation signal; first filter means for outputting low frequency side-band components, as a third local oscillation signal, from among high frequency side-band components and low frequency side-band components output as a result of the conversion at said local oscillation frequency conversion means; second filter means for outputting high frequency side-band components, as a fourth local oscillation signal, from among high frequency side-band components and low frequency side-band components output as a result of the conversion at said local oscillation frequency conversion means; first frequency conversion means for up-converting a communication signal into a first RF signal in the first communication band by mixing the communication signal with the third local oscillation signal; and second frequency conversion means for up-converting the communication signal into a second RF signal in the second communication band by mixing the communication signal with the fourth local oscillation signal.

Claim 23

A radio communication apparatus which performs communication using at least either a first communication band used for a first radio communication system or a second communication band used for a second communication system, comprising: first local oscillation signal generation means for generating a first local oscillation signal at a variable frequency; second local oscillation signal generation means for generating a second local oscillation signal at a predetermined frequency; local oscillation frequency conversion means for performing frequency conversion on the first local oscillation signal by mixing the first local oscillation signal with the second local oscillation signal; first filter means for outputting low frequency side-band components, as a third local oscillation signal, from among high frequency side-band components and low frequency side-band components output as a result of the conversion at said local oscillation frequency conversion means; second filter means for outputting high frequency side-band components, as a fourth local oscillation signal, from among high frequency side-band components and low frequency side-band components output as a result of the conversion at said local oscillation frequency conversion means; first frequency conversion means for up-converting a communication signal into a first RF signal in the first communication band by mixing the communication signal with the third local oscillation signal; and second frequency conversion means for up-converting the communication signal into a second RF signal in the second communication band by mixing the communication signal with the fourth local oscillation signal.

Claim 24

The radio communication apparatus according to claim 19 , wherein said second local oscillation signal generation means is means for generating a local oscillation signal used for modulation of the communication signal.

Claim 25

The radio communication apparatus according to claim 20 , wherein said second local oscillation signal generation means comprises: an oscillator; and third frequency conversion means for multiplying the frequency of a signal output by said oscillator by N (N>0) and for setting the multiplied signal as the local oscillation signal at the predetermined frequency.

Claim 26

The radio communication apparatus according to claim 20 , wherein said second local oscillation signal generation means comprises: first and second oscillators; third frequency conversion means for multiplying the frequency of a signal output by said first oscillator by N (N>0); and switch means for selectively outputting a signal output by said third frequency conversion means and a signal output by said second oscillator and for setting the outputted signal as the local oscillation signal at the predetermined frequency.

Claim 27

The radio communication apparatus according to claim 20 , wherein said second local oscillation signal generation means comprises: first and second oscillators; third frequency conversion means for multiplying the frequency of a signal output by said first oscillator by N (N>0); fourth frequency conversion means for multiplying the frequency of a signal output by said second oscillator by M (M>0); and switch means for selectively outputting a signal output by said third frequency conversion means and a signal output by said fourth frequency conversion means and for setting the outputted signal as the local oscillation signal at the predetermined frequency.

Claim 28

The radio communication apparatus according to claim 14 or 19 , further comprising: control means for selecting one of the first and second communication bands and generating a frequency instruction signal including the selected communication band; wherein a frequency of the first local oscillation signal is determined based on the generated frequency instruction signal.

Claim 29

A radio communication apparatus which performs communication using at least either a first communication band used for a first radio communication system or a second communication band used for a second communication system, comprising: first local oscillation signal generation means for generating a first local oscillation signal at a variable frequency; second local oscillation signal generation means for generating a second local oscillation signal at a predetermined frequency; local frequency conversion means for converting the first local oscillation signal into a third local oscillation signal by mixing the first local oscillation signal with the second local oscillation signal; first frequency conversion means for up-converting a communication signal into a first RF signal in the first communication band by mixing the communication signal with the first local oscillation signal; and second frequency conversion means for up-converting the communication signal into a second RF signal in the second communication band by mixing the communication signal with the third local oscillation signal.

Claim 30

A radio communication apparatus which performs communication using at least either a first communication band used for a first radio communication system or a second communication band used for a second communication system, comprising: first local oscillation signal generation means for generating a first local oscillation signal at a variable frequency; second local oscillation signal generation means for generating a second local oscillation signal at a predetermined frequency; local frequency conversion means for converting the first local oscillation signal into a third local oscillation signal by mixing the first local oscillation signal with the second local oscillation signal; first frequency conversion means for up-converting a communication signal into a first RF signal in the first communication band by mixing the communication signal with the first local oscillation signal; and second frequency conversion means for up-converting the communication signal into a second RF signal in the second communication band by mixing the communication signal with the third local oscillation signal.

Claim 31

A radio communication apparatus which receives a first RF signal in a first communication band or a second RF signal in a second communication band, comprising: first local oscillation signal generation means for generating a first local oscillation signal at a variable frequency; second local oscillation signal generation means for generating a second local oscillation signal at a predetermined frequency; local frequency conversion means for converting the first local oscillation signal into a third local oscillation signal by mixing the first local oscillation signal with the second local oscillation signal; first frequency conversion means for down-converting the received first RF signal into a communication signal by mixing the received first RF signal with the first local oscillation signal; and second frequency conversion means for down-converting the received second RF signal into the communication signal by mixing the received second RF signal with the third local oscillation signal.

Claim 32

A radio communication apparatus which receives a first RF signal in a first communication band or a second RF signal in a second communication band, comprising: first local oscillation signal generation means for generating a first local oscillation signal at a variable frequency; second local oscillation signal generation means for generating a second local oscillation signal at a predetermined frequency; local frequency conversion means for converting the first local oscillation signal into a third local oscillation signal by mixing the first local oscillation signal with the second local oscillation signal; first frequency conversion means for down-converting the received first RF signal into a communication signal by mixing the received first RF signal with the first local oscillation signal; and second frequency conversion means for down-converting the received second RF signal into the communication signal by mixing the received second RF signal with the third local oscillation signal.