Multi-band frequency synthesizer for mobile terminals
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United States of America Patent
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Dec 7, 2004
Grant Date -
Aug 21, 2003
app pub date -
Dec 10, 2002
filing date -
Dec 12, 2001
priority date (Note) -
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Abstract
A frequency synthesizer arrangement for generating signals with frequencies for UMTS and GSM/GPRS frequency bands and a mobile terminal with a respective frequency synthesizer arrangement are proposed, comprising a reference frequency source for providing a signal of constant reference frequency, a first frequency synthesizer sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a first type of frequency band, a second frequency synthesizer sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a second type of frequency band, whereby the second frequency synthesizer sub-unit further transforms the signal of the reference frequency source into a signal with an intermediate frequency, and a third frequency synthesizer sub-unit transforms the signal of the reference frequency source into an auxiliary signal with a fixed frequency which is used together with the signal of intermediate frequency for generating signals with frequencies in a range of a third and of a fourth type of frequency band.
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