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Transconductance amplifier

  • US 5,363,059 A
  • Filed: 06/17/1993
  • Issued: 11/08/1994
  • Est. Priority Date: 06/17/1993
  • Status: Expired due to Term
First Claim
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1. A low quiescent current, high output swing, low output impedance transconductance amplifier, comprising:

  • a first PMOS transistor having a source, a gate forming a first input, and a drain;

    a second PMOS transistor having a source connected to the source of the first PMOS transistor, a gate forming a second input, and a drain;

    a third PMOS transistor having a source connected to a first voltage source, a gate, and a drain connected to the source of the first PMOS transistor;

    a fourth PMOS transistor having a source connected to the first voltage source, a gate connected to the gate of the third PMOS transistor, and a drain connected to its gate;

    a fifth PMOS transistor having a source connected to the first voltage source, a gate connected to a first disable input, and a drain connected to the gate of the third PMOS transistor;

    a sixth PMOS transistor having a source connected to the first voltage source, a gate, and a drain connected to its gate;

    a seventh PMOS transistor having a source connected to the first voltage source, a gate connected to the gate of the sixth PMOS transistor, and a drain;

    an eighth PMOS transistor having a source connected to the first voltage source, a gate connected to the first disable input, and a drain connected to the gate of the sixth PMOS transistor;

    a ninth PMOS transistor having a source connected to the first voltage source, a gate connected to the first disable input, and a drain;

    a tenth PMOS transistor having a source, a gate connected to the drain of the ninth PMOS transistor, and a drain connected to its gate;

    an eleventh PMOS transistor having a source, a gate connected to the gate of the tenth PMOS transistor, and a drain connected to a second voltage source;

    a first NMOS transistor having a drain connected to a current source, a gate connected to its drain, and a source connected to the second voltage source;

    a second NMOS transistor having a drain connected to the gate of the first NMOS transistor, a gate connected to a second disable input, and a source connected to the second voltage source;

    a third NMOS transistor having a drain connected to the drain of the fourth PMOS transistor, a gate connected to the gate of the first NMOS transistor, and a source connected to the second voltage source;

    a fourth NMOS transistor having a drain connected to the drain of the first PMOS transistor, a gate connected to its drain, and a source;

    a fifth NMOS transistor having a drain connected to the drain of the sixth PMOS transistor, a gate connected to the gate of the fourth NMOS transistor, and a source;

    a sixth NMOS transistor having a drain connected to the drain of the second PMOS transistor, a gate connected to its drain, and a source;

    a seventh NMOS transistor having a drain connected to the drain of the tenth PMOS transistor, a gate connected to the gate of the sixth NMOS transistor, and a source;

    an eighth NMOS transistor having a drain connected to the gate of the sixth NMOS transistor, a gate connected to the second disable input, and a source connected to the second voltage source;

    a ninth NMOS transistor having a drain connected to the drain of the seventh PMOS transistor, a gate connected to its drain, and a source connected to the source of the tenth PMOS transistor;

    a tenth NMOS transistor having a drain connected to the first voltage source, a gate connected to the gate of the ninth NMOS transistor, and a source connected to the source of the eleventh PMOS transistor and forming an output of the amplifier;

    a capacitance having a first terminal connected to the drain of the second PMOS transistor and a second terminal connected to the output of the amplifier;

    a first resistance having a first terminal connected to the source of the fourth NMOS transistor and a second terminal connected to the second voltage source;

    a second resistance having a first terminal connected to the source of the fifth NMOS transistor and a second terminal connected to the second voltage source;

    a third resistance having a first terminal connected to the source of the sixth NMOS transistor and a second terminal connected to the second voltage source; and

    a fourth resistance having a first terminal connected to the source of the seventh NMOS transistor and a second terminal connected to the second voltage source.

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