发明名称 |
Down/up-conversion apparatus and method |
摘要 |
A down-converter converts an amplitude modulated high frequency signal into a low frequency or baseband signal. A first mixer (30, 32) mixes the high frequency signal into a composite signal having an in-phase component and a quadrature component. A complex bandpass filter (34) bandwidth limits the composite signal into a bandwidth limited signal with an in-phase component and a quadrature component. A second mixer (36, 38) mixes the bandwidth limited signal into an intermediate signal with an in-phase component and a quadrature component, and an adder (40) adds one component of the intermediate signal to the other. A similar up-converter performs the reverse process.
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申请公布号 |
US6611569(B1) |
申请公布日期 |
2003.08.26 |
申请号 |
US19980165644 |
申请日期 |
1998.10.02 |
申请人 |
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) |
发明人 |
SCHIER THORSTEN;SIGNELL SVANTE |
分类号 |
H03M1/12;H03D1/24;H03D7/16;H04L27/06;(IPC1-7):H03D3/00 |
主分类号 |
H03M1/12 |
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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