Invention Grant
US08531238B2 Multi-stage fully differential amplifier with controlled common mode voltage 有权
具有受控共模电压的多级全差分放大器

  • Patent Title: Multi-stage fully differential amplifier with controlled common mode voltage
  • Patent Title (中): 具有受控共模电压的多级全差分放大器
  • Application No.: US13347918
    Application Date: 2012-01-11
  • Publication No.: US08531238B2
    Publication Date: 2013-09-10
  • Inventor: Dirk Killat
  • Applicant: Dirk Killat
  • Applicant Address: DE Kirchheim/Teck-Nabern
  • Assignee: Dialog Semiconductor GmbH
  • Current Assignee: Dialog Semiconductor GmbH
  • Current Assignee Address: DE Kirchheim/Teck-Nabern
  • Agency: Saile Ackerman LLC
  • Agent Stephen B. Ackerman
  • Priority: EP11392010 20111230
  • Main IPC: H03F1/02
  • IPC: H03F1/02
Multi-stage fully differential amplifier with controlled common mode voltage
Abstract:
Disclosed are systems and methods to achieve a low noise, fully differential amplifier with controlled common mode voltages at each stage output but without the requirement of a common mode feedback loop. Common mode voltages are adjusted by adjusting the currents flowing through the load impedances (bias currents) wherein the currents are derived from one or more voltage-to-current converters based on an impedance that matches to the load impedances of the stages of the amplifier. The amplifier invented is primarily used for amplification of low frequency signals. The amplifier has one or more gain stages applying only one conduction type of transistors of an IC technology that has the lowest transition frequency between 1/f noise and white noise to achieve a low chopping or autozeroing frequency.
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