Wireless transmitter

Details Wireless transmitter Wireless transmitter

2006-04-25

2006-04-25

Vo, Nguyen T. (Department: 2685)

Telecommunications

Transmitter

Frequency conversion

C455S119000

Reexamination Certificate

active

07035603

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.

REFERENCES:
patent: 5022054 (1991-06-01), Wang
patent: 5425055 (1995-06-01), Blaker
patent: 6005894 (1999-12-01), Kumar
patent: 6025758 (2000-02-01), Lu
patent: 6430232 (2002-08-01), Patire

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