Invention Grant
- Patent Title: Resistance-capacitance calibration circuit without current mismatch and method thereof
- Patent Title (中): 无电流不匹配的电阻电容校准电路及其方法
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Application No.: US13439877Application Date: 2012-04-05
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Publication No.: US08729907B2Publication Date: 2014-05-20
- Inventor: Shiau-Wen Kao
- Applicant: Shiau-Wen Kao
- Applicant Address: TW Hsinchu Science Park, Hsin-Chu
- Assignee: NOVATEK Microelectronics Corp.
- Current Assignee: NOVATEK Microelectronics Corp.
- Current Assignee Address: TW Hsinchu Science Park, Hsin-Chu
- Agent Winston Hsu; Scott Margo
- Priority: TW101104510A 20120213
- Main IPC: G01R35/00
- IPC: G01R35/00

Abstract:
A resistor-capacitor (RC) calibration circuit includes: a current source, providing a current to a first node; a first switch, coupled between the first node and a second node; a second switch, coupled between the first node and a third node; a resistor, coupled between a reference terminal and the second node; a variable capacitor, coupled between the reference terminal and the third node; a third switch, coupled between the third node and the reference terminal; a comparator, comprising a first input coupled to the second node and a second input coupled to the third node; and a logic controller, coupled between an output of the comparator and the variable capacitor for outputting an adjusting signal according to an output signal of the comparator to adjust a capacitance of the variable capacitor.
Public/Granted literature
- US20130207693A1 Resistance-Capacitance Calibration Circuit without Current Mismatch and Method thereof Public/Granted day:2013-08-15
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