发明名称 |
MULTI-BAND TRANSCEIVER HAVING MULTI-SLOT CAPABILITY |
摘要 |
A multi-band transceiver for receiving and transmitting signals within selected GSM frequency bands. Transmission and reception occurs simultaneously and within the same time slot of a TDMA frame. The transceiver includes a first local oscillator LO1 that selectively oscillates within a bandwidth corresponding to the selected GSM band and outputs a signal having a frequency fLO1. A second local oscillator LO2 selectively oscillates at a frequency corresponding to the selected GSM band and outputs a signal having a frequency fLO2. A receiver receives a signal having a frequency fRx and mixes the signals from the first and second local oscillators to generate a demodulating signal having a frequency fRx, wherein fRx = fLO1 +/- fLO2. A transmitter having a loop architecture includes a VCO that generates a signal having a transmit frequency fTx equal to fRx minus a comparison frequency fCF, and a mixer that mixes the signal from the first local oscillator with the transmit signal to generate an IF signal having a frequency fIF = fLO2 +/- fCF. A quadrature mixer that modulates the IF signal with baseband "I" and "Q" signals, and a phase detector that compares the phases of the IF signal and the signal from the second local oscillator and outputs a control voltage to the VCO.
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申请公布号 |
WO0117124(A1) |
申请公布日期 |
2001.03.08 |
申请号 |
WO2000US23870 |
申请日期 |
2000.08.30 |
申请人 |
CONEXANT SYSTEMS, INC. |
发明人 |
DAMGAARD, MORTEN;THAM, J., L., JULIAN |
分类号 |
H04B1/40;(IPC1-7):H04B1/40 |
主分类号 |
H04B1/40 |
代理机构 |
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主权项 |
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地址 |
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