发明名称 |
Down/up-conversion mixer for direct conversion radios |
摘要 |
A RF down/up-conversion circuit comprising: 1) a local oscillator chopping circuit comprising: a) a frequency divider circuit for receiving a first local oscillator (LO) signal having a frequency of LO and generating a frequency-divided second local oscillator (LO) signal having a frequency of LO/N and synchronized with the first LO signal; and b) a multiplier for receiving the first and second LO signals and generating a product signal of the first and second LO signals; and 2) a differential radio frequency (RF) mixer having a first differential input port for receiving the product signal from the multiplier and a second differential input port for receiving a first differential modulated radio frequency (RF) signal and a second differential modulated radio frequency (RF) signal, wherein the differential RF mixer generates a differential output signal.
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申请公布号 |
US6959179(B1) |
申请公布日期 |
2005.10.25 |
申请号 |
US20020068293 |
申请日期 |
2002.02.06 |
申请人 |
NATIONAL SEMICONDUCTOR CORPORATION |
发明人 |
WONG HEE;JU SHU-ING |
分类号 |
H04B1/26;H04B1/30;(IPC1-7):H04B1/26 |
主分类号 |
H04B1/26 |
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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