发明名称 |
APPARATUS AND METHOD FOR VARYING THE COUPLING OF A RADIO FREQUENCY SIGNAL |
摘要 |
An apparatus and method for varying coupling of a radio frequency (RF) signal (408). This is advantageously used for increasing the dynamic range of a power detector (406) in an automatic power level control loop (403) of a transmission unit (404), while maintaining transmission unit efficiency at higher power levels. This is accomplished by selecting between a first operating mode of the RF coupler (405) having strong coupling, responsive to a first predetermined power level, such that the RF coupler (405) produces a first coupled RF signal (509) responsive to the RF signal (408) and a second operating mode of the RF coupler (405) having weak coupling, responsive to a second predetermined power level, such that the RF coupler (405) produces a second coupled RF signal (510) responsive to the RF signal (408). |
申请公布号 |
WO9425997(A1) |
申请公布日期 |
1994.11.10 |
申请号 |
WO1994US03713 |
申请日期 |
1994.04.05 |
申请人 |
MOTOROLA, INC. |
发明人 |
SCHWENT, DALE, GERALD;OSMANI, RASHID, MASHID, M. |
分类号 |
H01P5/04;H01P5/12;H01P5/18;H04B1/04;(IPC1-7):H01P5/18 |
主分类号 |
H01P5/04 |
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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