Invention Grant
US07091892B2 Method for implementation of a low noise, high accuracy current mirror for audio applications 有权
用于实现音频应用的低噪声,高精度电流镜的方法

  • Patent Title: Method for implementation of a low noise, high accuracy current mirror for audio applications
  • Patent Title (中): 用于实现音频应用的低噪声,高精度电流镜的方法
  • Application No.: US11008367
    Application Date: 2004-12-09
  • Publication No.: US07091892B2
    Publication Date: 2006-08-15
  • Inventor: David TesterGary HagueJorg Medwed
  • Applicant: David TesterGary HagueJorg Medwed
  • Applicant Address: DE Kirchheim/Teck-Nabern
  • Assignee: Dialog Semiconductor GmbH
  • Current Assignee: Dialog Semiconductor GmbH
  • Current Assignee Address: DE Kirchheim/Teck-Nabern
  • Agent Saile Ackerman LLC; Stephen B. Ackerman
  • Priority: EP04368073 20041203
  • Main IPC: H03M1/00
  • IPC: H03M1/00
Method for implementation of a low noise, high accuracy current mirror for audio applications
Abstract:
An accurate high current mirror circuit produces a mirrored current that matches an input current to produce an accuracy at the output of a subsequent stage of amplification of greater than 0.01%. A plurality of transistor devices are arranged in a symmetrical configuration and divided into two groups. The transistors in each of the two groups are connected in parallel to produce a high mirror current from a high input current. A distribution of a source voltage produces the same source voltage at each of the plurality of transistors. An input current metallization and a mirror current metallization are formed within the symmetrical configuration to have a same value of impedance. A plurality of P-channel transistors within the current mirror circuit control a voltage of a point on the input metallization to be the same as a reference voltage, thus causing the mirror current to be referenced around the reference voltage.
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