Multiband data communication apparatus, communication method...

Details Multiband data communication apparatus, communication method... Multiband data communication apparatus, communication method...

2006-07-18

2006-07-18

Tran, Khanh (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

Reexamination Certificate

active

07079596

ABSTRACT:
A quadrature demodulator408′ and a quadrature modulator908′ convert a reception intermediate frequency signal151into reception baseband signals157and158, and also convert transmission baseband signals657and658into a transmission intermediate frequency signal651, respectively. While local oscillation signals having frequencies suitable for the respective bands are outputted from a commonly used local oscillator111, such a local oscillation signal obtained by shifting a phase thereof π/2 by a phase shifter412is supplied to one mixer of quadrature mixers109and609, and such a signal obtained by inverting, or not inverting the plurality of the local oscillation signal by an exclusive OR gate circuit413in response to a band switching signal153is supplied to the other mixer of quadrature mixers110and610.

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