Invention Grant
US09093963B2 Amplifier and filter having cutoff frequency controlled according to digital code
有权
具有根据数字代码控制的截止频率的放大器和滤波器
- Patent Title: Amplifier and filter having cutoff frequency controlled according to digital code
- Patent Title (中): 具有根据数字代码控制的截止频率的放大器和滤波器
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Application No.: US13777599Application Date: 2013-02-26
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Publication No.: US09093963B2Publication Date: 2015-07-28
- Inventor: Jong-Woo Lee
- Applicant: Samsung Electronics Co. Ltd.
- Applicant Address: KR Suwon-si
- Assignee: Samsung Electronics Co., Ltd.
- Current Assignee: Samsung Electronics Co., Ltd.
- Current Assignee Address: KR Suwon-si
- Agency: Jefferson IP Law, LLP
- Priority: KR10-2012-0047612 20120504
- Main IPC: H03F1/34
- IPC: H03F1/34 ; H03F3/45
Abstract:
An amplifier circuit is provided. The amplifier circuit includes an operational amplifier, a feedback resistor for changing gain and cutoff frequency characteristics of the operational amplifier, and a feedback variable capacitor for changing the cutoff frequency characteristics of the operational amplifier, wherein a capacitance of the feedback variable capacitor increases exponentially according to a digital control code, and the cutoff frequency of the operational amplifier is inversely proportional to the capacitance of the feedback variable capacitor and varies linearly on a logarithmic scale.
Public/Granted literature
- US20130293305A1 AMPLIFIER AND FILTER HAVING CUTOFF FREQUENCY CONTROLLED ACCORDING TO DIGITAL CODE Public/Granted day:2013-11-07
Information query
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