Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-03-07
1998-12-22
Chin, Wellington
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455143, 455209, 455314, H04B 140
Patent
active
058527842
ABSTRACT:
A multiband mobile unit communication apparatus is disclosed which comprises: an antenna for receiving 1st and 2nd bands of radio wave SIGs including quadrature modulation SIGs; a 1st LO CKT for generating a 1st LO SIG; 1st and 2nd receiving CKTs for generating 1st and 2nd IF SIGs from the 1st and 2nd bands of radio wave SIGs using the 1st LO SIG respectively; a switching CKT responsive to a switching control SIG indicative of 1st and 2nd modes for outputting the 1st IF SIG in the 1st mode and outputting the 2nd IF SIG in the 2nd mode; a 2nd LO CKT for generating 2nd and 3rd LO SIGs in the 1st and 2nd modes respectively; and a quadrature demodulation CKT for demodulating and outputting quadrature SIGs from an output from the switching CKT using the 2nd and third LO SIGs in the 1st and 2nd modes respectively. The 2nd LO CKT comprises: a local oscillator for generating a 4th LO SIG, a FRQ divider for dividing the 4th LO SIG with a given divisor and generating the 2nd LO SIG; and a switch for outputting the 2nd LO SIG in the 1st mode and outputting the 4th LO SIG as the 3rd LO SIG in the 2nd mode in response to the switching control SIG. The given divisor corresponds to a ratio between center FRQs of the 1st and 2nd IF SIGs. The 2nd LO CKT may change the LO FRQ by switchably connecting resonating elements to an oscillator.
REFERENCES:
patent: 5239697 (1993-08-01), Kosuga
patent: 5280636 (1994-01-01), Kelley et al.
patent: 5437051 (1995-07-01), Oto
patent: 5590174 (1996-12-01), Tsuji et al.
Ito Fumio
Kosugi Hiroaki
Sasaki Fujio
Yamaguchi Seiichi
Chin Wellington
Matsushita Electric - Industrial Co., Ltd.
Nguyen Lee
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