发明授权
US06369652B1 Differential amplifiers with current and resistance compensation elements for balanced output 失效
具有电流和电阻补偿元件的差分放大器,用于平衡输出

  • 专利标题: Differential amplifiers with current and resistance compensation elements for balanced output
  • 专利标题(中): 具有电流和电阻补偿元件的差分放大器,用于平衡输出
  • 申请号: US09571089
    申请日: 2000-05-15
  • 公开(公告)号: US06369652B1
    公开(公告)日: 2002-04-09
  • 发明人: Huy M. NguyenBenedict C. LauRoxanne T. Vu
  • 申请人: Huy M. NguyenBenedict C. LauRoxanne T. Vu
  • 主分类号: H03F345
  • IPC分类号: H03F345
Differential amplifiers with current and resistance compensation elements for balanced output
摘要:
A differential amplifier has unequal resistance in its legs that compensates for an unequal current flow through the legs during a logic zero data input compared to logic one data input. The unequal resistance may be provided by adding a resistor in parallel to the leg that carries greater current during amplification, lowering the resistance in that leg and also the voltage that is output from that leg. Alternatively, a variable resistance may be provided to at least one of the legs to compensate for current inequalities between the legs. The variable resistance may be provided by a transistor that is controlled by a signal indicating process, voltage and/or temperature conditions of the amplifier and adjacent circuitry. Transistors may be employed in both legs as well as in a current source for the amplifier, providing balanced current regulation for the amplifier. Such current compensated differential amplifiers may be employed for various functions, for example as input receivers or delay elements in high frequency memory systems.
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