发明名称 |
Direct conversion time division duplex radio, direct sequence spread spectrum cordless telephone |
摘要 |
A wireless transceiver comprises a digital to analog converter having an input for receiving a digital representation of a direct sequence spread spectrum signal and having an analog output. A bandpass or lowpass filter has an input coupled to the analog output of the digital to analog converter and has a filtered output. An adder has a first input coupled to the filtered output and a second input coupled to a loop control voltage generated by a phase lock loop. The adder produces a summed output. A VCO integrated into the phase lock loop has a control input coupled to the summed output. An RF output of the VCO produces a continuous phase frequency shift keyed spread spectrum signal in response to the digital representation of the direct sequence spread spectrums signal.
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申请公布号 |
US6411646(B1) |
申请公布日期 |
2002.06.25 |
申请号 |
US19980107733 |
申请日期 |
1998.06.30 |
申请人 |
CONEXANT SYSTEMS, INC. |
发明人 |
WALLEY JOHN S.;LAUB D. VINCENT;BEAMISH NORMAN J. |
分类号 |
H04B1/30;H04B1/40;(IPC1-7):H04B15/00;H04K1/00;H04L27/30 |
主分类号 |
H04B1/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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