发明名称 |
AGC circuit |
摘要 |
An AGC circuit of the present invention includes a first up/down counter for converting the amount of change in an output voltage higher than a threshold voltage into a count value and controlling a gain of a variable gain amplifier circuit and a second up/down counter to which a reference clock having a lower frequency than that of a reference clock supplied to the first up/down counter is supplied. Count values of the first and second up/down counters are D/A-converted and then compared with each other by a voltage comparator. An up/down count of the first up/down counter is controlled based on a comparison result and the gain of the variable gain amplifier circuit is controlled using only a signal based on the count value of the first up/down counter, thereby suppressing distortion of an output waveform and the generation of a frequency signal which is not originally input.
|
申请公布号 |
US7015759(B2) |
申请公布日期 |
2006.03.21 |
申请号 |
US20040899006 |
申请日期 |
2004.07.27 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
ISHIDA TAKUMA;FUJII KEIICHI |
分类号 |
H03G3/10;H03G3/20;H03G3/00;H03G3/30 |
主分类号 |
H03G3/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|