发明名称 |
Automatic gain control circuit |
摘要 |
An automatic gain control circuit having a variable gain amplifier circuit, a signal level detecting circuit connected to the variable gain amplifier circuit for generating a detect signal the level of which changes in response to a signal level of an output signal of the variable gain amplifier circuit, and a gain control circuit for controlling the gain of the variable gain amplifier circuit in accordance with the signal level of the detect signal, and the gain control circuit having a differential amplifier circuit having first and second input terminals, the first and second input terminals being connected to the signal level detecting circuit for receiving the detect signal, a first reference voltage source connected to the first input terminal of the differential amplifier so that a first predetermined voltage is provided instead of the signal level of the detect signal in response to the signal level of the detect signal and a second reference voltage source connected to the second input terminal of the differential amplifier for providing a second predetermined voltage.
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申请公布号 |
US4928074(A) |
申请公布日期 |
1990.05.22 |
申请号 |
US19890365672 |
申请日期 |
1989.06.13 |
申请人 |
SONY CORPORATION |
发明人 |
SATO, MITSURU;IIZUKA, TETSUYA;FURUYA, KIYOSHI;SHOJI, NORIO;SEKINE, MASATO |
分类号 |
H03G3/30;H03G1/00;H03G3/10;H03G3/20 |
主分类号 |
H03G3/30 |
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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