发明名称 |
Amplifier with feedforward loops for rejecting non-linear distortion |
摘要 |
An amplifier with feedforward loops for rejecting non-linear distortion and control circuitry for such amplifier and employing a distortion compensation method. A signal from a dominant path is input into a synchronizing detector via an ALC circuit as a reference signal. Using this reference signal, an error signal output from a distortion rejection loop is subjected to synchronizing detection. An offset voltage of a mixer inside the synchronizing detector can be prevented from varying due to change in local level. Outputs from synchronizing detectors are used for control to optimize corresponding loops. As a pilot signal for a distortion detection loop can be eliminated, undesirable spurious effects due to such a pilot signal is avoided. The acquisition time of each of the loops can be shortened because an optimizing control using a step-by-step procedure under CPU control can be eliminated.
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申请公布号 |
US6172560(B1) |
申请公布日期 |
2001.01.09 |
申请号 |
US19990418014 |
申请日期 |
1999.10.14 |
申请人 |
JAPAN RADIO CO., LTD. |
发明人 |
YAMASHITA KAZUO;NAKAGAWA YASUSHI;YAMADA AKIRA |
分类号 |
H03F1/32;H04J1/00;(IPC1-7):H03F3/66 |
主分类号 |
H03F1/32 |
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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