Multi-band radio terminal apparatus

Details Multi-band radio terminal apparatus Multi-band radio terminal apparatus

2005-04-19

2005-04-19

Gary, Erika A. (Department: 2681)

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

C455S086000, C455S552100

Reexamination Certificate

active

06882830

ABSTRACT:
In a multi-band radio terminal apparatus, when communication frequency bands are switched, a reception intermediate frequency is selected to be equal to each other in respective communication frequency bands. As a result, the circuit arrangements of this multi-band radio terminal apparatus succeeding to the intermediate frequency signal circuit stage are commonly used in the respective communication frequency bands. While a local oscillator signal is produced by a voltage-controlled oscillator, a phase-locked loop, and a doubler, in a case where communication is established within a plurality of communication frequency bands, the transmission/reception frequency intervals are different from each other. A mixer for a reception system and a mixer for a transmission system are commonly used so as to convert the frequency of the local oscillator signal into a frequency existing between the communication frequency and the intermediate frequency.

REFERENCES:
patent: 5794159 (1998-08-01), Portin
patent: 5852784 (1998-12-01), Ito et al.
patent: 6014571 (2000-01-01), Enoki
patent: 6029052 (2000-02-01), Isberg et al.
patent: 6175746 (2001-01-01), Nakayama et al.
patent: 6256511 (2001-07-01), Brown et al.
patent: 6438358 (2002-08-01), Higuchi
patent: 6587673 (2003-07-01), Higuchi

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