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Complementary current reusing preamp for operational amplifier

  • US 10,305,502 B2
  • Filed: 07/05/2018
  • Issued: 05/28/2019
  • Est. Priority Date: 06/19/2014
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a preamplifier stage including;

    an output;

    a current source;

    a PMOS differential pair coupled to a power supply side of the preamplifier stage, sources of the PMOS differential pair being coupled to the current source;

    an NMOS differential pair coupled to a ground side of the preamplifier stage, drains of the NMOS differential pair being coupled to respective drains of the PMOS differential pair at the output;

    a diode-connected device coupled to the output and ground; and

    a cross-coupled circuit coupled to the diode-connected device to adjust a gain of the preamplifier stage;

    wherein in the gain of the preamplifier is given by a ratio of a transconductance of the PMOS differential pair and the NMOS differential pair to a transconductance of the diode-connected device divided by N−

    1 where N is a ratio of size of the diode-connected device to the cross-coupled circuit.

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