Wireless transmitter
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United States of America Patent
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Apr 25, 2006
Grant Date -
Aug 26, 2004
app pub date -
Feb 26, 2003
filing date -
Feb 26, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A wireless transmitter is proposed. First, a ROM having a lookup table therein is provided. The lookup table is used to store a plurality of IF modulation signals so that a state machine can select a corresponding IF modulation signal from the lookup table of the ROM according to loaded data and output a digital IF modulation signal to a DAC, which then converts the digital IF modulation signal into an analog IF modulation signal to be filtered by a low pass filter. Finally, a local oscillator is utilized to modulate the filtered analog IF modulation signal to an emission frequency, hence obtaining an RF signal. The transmitter makes use of a time-sharing way to use a local oscillator together with the receiver. Complexity of device can thus be simplified to meet the requirement of compactness of wireless products.
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