发明名称 |
APPARATUS AND CIRCUIT FOR AMPLIFYING BASEBAND SIGNAL |
摘要 |
An operational amplifier circuit is provided. The operational amplifier circuit includes a differential amplifier of a cascade structure and a switched-capacitor type Common-Mode FeedBack (CMFB) circuit. The differential amplifier amplifies a difference between two input signals to output an anode output voltage and a negative output voltage. The switched-capacitor type CMFB circuit averages the anode output voltage and the negative output voltage of the differential amplifier, compares the average voltage with a reference voltage to generate a feedback signal based on a result of the comparison, and provides the feedback signal to the differential amplifier. Therefore, power consumption is reduced and a battery use time of a wireless terminal can be extended. Also, since an operational amplifier gain of each analog filter terminal is not negatively affected, a Direct Current (DC) offset is reduced, thereby improving signal quality. |
申请公布号 |
EP2792070(A4) |
申请公布日期 |
2015.07.22 |
申请号 |
EP20120856900 |
申请日期 |
2012.12.14 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
LEE, JONG-WOO;JUN, SI-BUM |
分类号 |
H03F3/45;H03F1/34;H03F3/195;H03F3/70;H03H11/12 |
主分类号 |
H03F3/45 |
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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