Radio Communication device capable of setting a frequency channel with a small frequency step
First Claim
1. A radio communication device comprising:
- a carrier generating circuit for generating a transmit carrier signal, said carrier generating circuit comprising a first frequency synthesizer capable of varying an intermediate frequency of said transmit carrier signal using a first step frequency;
a radio-frequency local signal generating circuit for generating a radio-frequency local signal, said radio-frequency local signal generating circuit comprising a second frequency synthesizer capable of varying a radio frequency of said radio-frequency local signal using a second step frequency different from said first step frequency;
a transmitting section connected to said carrier generating and said radio-frequency local signal generating circuits for generating a transmit radio-frequency signal in response to said transmit carrier signal and said radio-frequency local signal with a frequency up-conversion to transmit said transmit radio-frequency signal; and
a control circuit connected to said first and said second frequency synthesizers for cooperatively controlling said first and said second frequency synthesizers so as to allow a transmission channel to be set with a frequency step equal to a difference between said first and said second step frequencies.
1 Assignment
0 Petitions
Accused Products
Abstract
A radio communication device includes a transmission carrier generating circuit, a reception intermediate-frequency local signal generating circuit), a transmission radio-frequency local signal generating circuit and a reception radio-frequency local signal generating circuit, each of which is in the form of a frequency synthesizer. The radio communication device further includes a channel connection signal control circuit which cooperatively controls the transmission carrier generating circuit and the transmission radio-frequency local signal generating circuit and cooperatively controls the reception intermediate-frequency local signal generating circuit and the reception radio-frequency local signal generating circuit.
-
Citations
12 Claims
-
1. A radio communication device comprising:
-
a carrier generating circuit for generating a transmit carrier signal, said carrier generating circuit comprising a first frequency synthesizer capable of varying an intermediate frequency of said transmit carrier signal using a first step frequency; a radio-frequency local signal generating circuit for generating a radio-frequency local signal, said radio-frequency local signal generating circuit comprising a second frequency synthesizer capable of varying a radio frequency of said radio-frequency local signal using a second step frequency different from said first step frequency; a transmitting section connected to said carrier generating and said radio-frequency local signal generating circuits for generating a transmit radio-frequency signal in response to said transmit carrier signal and said radio-frequency local signal with a frequency up-conversion to transmit said transmit radio-frequency signal; and a control circuit connected to said first and said second frequency synthesizers for cooperatively controlling said first and said second frequency synthesizers so as to allow a transmission channel to be set with a frequency step equal to a difference between said first and said second step frequencies. - View Dependent Claims (2, 3)
-
-
4. A radio communication device comprising:
-
a radio-frequency local signal generating circuit for generating a radio-frequency local signal, said radio-frequency local signal generating circuit comprising a first frequency synthesizer capable of varying a radio frequency of said radio-frequency local signal using a first step frequency; a reception intermediate-frequency local signal generating circuit for generating a receive intermediate-frequency local signal, said reception intermediate-frequency local signal generating circuit comprising a second frequency synthesizer capable of varying an intermediate frequency of said receive intermediate frequency local signal using a second step frequency different from said first step frequency; a receiving section connected to said radio-frequency local signal generating and said reception intermediate-frequency local signal generating circuits for receiving a receive radio-frequency signal to produce a receive baseband signal in response to said radio-frequency local signal and said receive intermediate-frequency local signal with a frequency down-conversion of said receive radio-frequency signal; and a control circuit connected to said first and said second frequency synthesizers for cooperatively controlling said first and said second frequency synthesizers so as to allow a reception channel to be set with a frequency step equal to a difference between said first and said second step frequencies. - View Dependent Claims (5, 6)
-
-
7. A radio communication device comprising:
-
a transmission carrier generating circuit for generating a transmit carrier signal, said transmission carrier generating circuit comprising a first frequency synthesizer capable of carrying an intermediate frequency of said transmit carrier signal using a first step frequency; a radio-frequency local signal generating circuit for generating a radio-frequency local signal, said radio-frequency local signal generating circuit comprising a second frequency synthesizer capable of varying a radio frequency of said radio-frequency local signal using a second step frequency different from said first step frequency; a transmitting section for modulating said transmit carrier signal with a transmit baseband signal to produce a transmit intermediate-frequency signal, performing a frequency up-conversion of said transmit intermediate-frequency signal using said radio-frequency local signal to produce a transmit radio-frequency signal and transmitting said transmit radio-frequency signal; a receiving section for receiving a receive radio-frequency signal and demodulating said receive radio-frequency signal using said radio-frequency local signal to produce a receive baseband signal; and a control circuit connected to said first and said second frequency synthesizers for controlling said first and said second frequency synthesizers so as to allow a transmission channel to be set with a frequency step equal to a difference between said first and said second step frequencies, while allowing a reception channel to be sent with a reception frequency step equal to said second step frequency. - View Dependent Claims (8, 9, 10, 11, 12)
-
Specification