Radio apparatus adapted to remove image components from local os

Details Radio apparatus adapted to remove image components from local os Radio apparatus adapted to remove image components from local os

1999-03-23

2000-11-14

Nguyen, Lee

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 76, 455285, 455302, H04B 140

Patent

active

061481815

ABSTRACT:
A radio apparatus comprises a local oscillation signal generator which includes a first local oscillation unit for generating a first local oscillation signal having a frequency f.sub.LO1 to be divided into third and fourth local oscillation signals having a phase difference of 90 degrees and a second local oscillation unit for generating a second local oscillation signal having a frequency f.sub.LO2 to be divided into fifth and sixth local oscillation signals having a phase difference of 90 degrees. The local oscillation signal generator includes an arithmetic unit for adding or subtracting the multiplication result of the third and fifth local oscillation signals and the multiplication result of the fourth and sixth local oscillation signals to obtain a local oscillation signal from which an image signal is removed.

REFERENCES:
patent: 4731875 (1988-03-01), Mizukami et al.

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