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High-gain, bulk-driven operational amplifiers for system-on-chip applications

  • US 7,088,178 B1
  • Filed: 06/18/2004
  • Issued: 08/08/2006
  • Est. Priority Date: 06/19/2003
  • Status: Expired due to Fees
First Claim
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1. A rail-to-rail operational transconductance amplifier comprising:

  • an input;

    an output; and

    an amplifier core connected to the input and the output;

    wherein the amplifier core comprises a bulk-driven operational transconductance amplifier element and an auxiliary gain-boosting amplifier connected to the bulk-driven operational transconductance amplifier element to boost a gain of the bulk-driven operational transconductance amplifier element, and wherein the bulk-driven operational transconductance amplifier element and the auxiliary gain-boosting amplifier are connected to provide local feedback action between the bulk-driven operational transconductance amplifier element and the auxiliary gain-boosting amplifier to reduce variations in bias current in the bulk-driven operational transconductance amplifier element.

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