Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1997-10-10
1999-11-30
Loomis, Paul
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551801, 455557, 455143, H04B 118
Patent
active
059958154
ABSTRACT:
The present invention relates to a multiple band receiver comprised in a mobile terminal. The receiver is able to receive radio signals in an upper frequency band (FB.sub.U) and a lower frequency band (FB.sub.L). The multiple band receiver comprises an antenna (ANT), a converting receiver part (R1), a heterodyne receiver part (R2) and a voltage controlled oscillator (VCO). The voltage controlled oscillator generates local oscillator frequencies (f.sub.LO) substantially equal to the frequency shift between the two frequency bands. Radio signals (f.sub.RF) in the upper frequency band (FB.sub.U) are converted in the converting receiver part (R1) to substantially the lower frequency band (FB.sub.L) by mixing with a local oscillator frequency (f.sub.LO). The converted signal is mixed in the heterodyne receiver part (R2) with the same local oscillator frequency (f.sub.LO) thus generating the same first intermediate frequency (f.sub.IF1) as for signals in the upper frequency band.
REFERENCES:
patent: 4259644 (1981-03-01), Iimura
patent: 4972455 (1990-11-01), Phillips et al.
patent: 5422931 (1995-06-01), Austin-Lazarus
patent: 5457734 (1995-10-01), Eryaman et al.
patent: 5564076 (1996-10-01), Auvray
patent: 5732330 (1998-03-01), Anderson et al.
patent: 5835853 (1998-11-01), Enoki et al.
PCT International-Type Search Report re: SE96/01100 completed Jul. 25, 1997 .
Loomis Paul
Telefonaktiebolaget LM Ericsson
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