发明名称 |
Cartesian loop transmitter and method of adjusting an output level of such transmitter |
摘要 |
A Cartesian loop transmitter having isolator eliminator circuitry is presented. The isolator eliminator circuitry includes a set of low pass and wide band pass as well as narrow band pass filters for each of I- and Q-channels, root mean square detectors and dividers connected to a means for comparing. Signals from the means for comparing are received by a microprocessor which controls attenuation setting. The output level of the transmitter is adjusted by generating a small signal measuring an on-channel signal level and a small signal level and then calculating a ratio of the small signal to the on-channel signal. The attenuation setting is increased if the ratio exceeds a defined threshold.
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申请公布号 |
US7502599(B2) |
申请公布日期 |
2009.03.10 |
申请号 |
US20040563466 |
申请日期 |
2004.05.20 |
申请人 |
MOTOROLA, INC. |
发明人 |
BEN-AYUN MOSHE;AVAYU IZAK;ROZENTAL MARK |
分类号 |
H01Q11/12;H03F1/32;H03F1/34;H03F3/24 |
主分类号 |
H01Q11/12 |
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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