Invention Grant
US08729907B2 Resistance-capacitance calibration circuit without current mismatch and method thereof 有权
无电流不匹配的电阻电容校准电路及其方法

  • 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
  • Application No.: US13439877
    Application Date: 2012-04-05
  • Publication No.: US08729907B2
    Publication 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
Resistance-capacitance calibration circuit without current mismatch and method thereof
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.
Information query
Patent Agency Ranking
0/0