发明名称 |
LOCAL OSCILLATOR LEAKAGE CONTROL IN DIRECT CONVERSION PROCESSES |
摘要 |
<P>PROBLEM TO BE SOLVED: To provide local oscillator leakage control in direct conversion processes. <P>SOLUTION: A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus, the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications. <P>COPYRIGHT: (C)2009,JPO&INPIT |
申请公布号 |
JP2008306759(A) |
申请公布日期 |
2008.12.18 |
申请号 |
JP20080203318 |
申请日期 |
2008.08.06 |
申请人 |
QUALCOMM INC |
发明人 |
PETERZELL PAUL E;MALDONADO DAVID;GARD KEVIN;SEE PUAY HOE ANDREW;DUNWORTH JEREMY D;SAHOTA KAMAL |
分类号 |
H03L7/183;H04B1/26;H04B1/30 |
主分类号 |
H03L7/183 |
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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