发明名称 |
DIRECT CONVERSION UP-CONVERTER FOR BROADBAND WIRELESS ACCESS EQUIPMENT |
摘要 |
A direct conversion up-converter provides direct up-conversion of a modulated broadband intermediate frequency ("IF") signal, which is on the order of 5 to 50 MHz, to a modulated radio frequency ("RF") signal, which is on the order of 70 MHz to 60 GHz. The direct up-conversion does not use super-heterodyne mixing. The direct conversion up-converter includes a demodulator unit to demodulate the modulated IF signal into a real baseband signal component ("I") and an imaginary baseband signal component ("Q"). Each basedband signal component I and Q is then amplified and passed through a bandpass filter to remove high frequency noise. The filtered baseband signal I and Q are then modulated by a modulator unit into a modulated RF signal. The demodulator unit performs the demodulation with an oscillation frequency corresponding to the modulation frequency of the modulated IF signal. The modulator unit performs the modulation with a second oscillator frequency which corresponds to a desired modulation frequency of the modulated RF signal. The demodulator unit and the modulator unit are formed from a plurality of integrated circuits disposed on a signal circuit board.
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申请公布号 |
WO0167592(A3) |
申请公布日期 |
2003.05.15 |
申请号 |
WO2001US40268 |
申请日期 |
2001.03.08 |
申请人 |
SPIKE BROADBAND SYSTEMS, INC. |
发明人 |
YURTKURAN, EROL, KENNETH;MASTERS, JEFFREY, TONY;BENNETT, DAVID, SCOTT |
分类号 |
H03D7/16;(IPC1-7):H03D7/16;H03C3/40 |
主分类号 |
H03D7/16 |
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