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Band gap reference using a low voltage power supply

  • US 6,031,365 A
  • Filed: 03/26/1999
  • Issued: 02/29/2000
  • Est. Priority Date: 03/27/1998
  • Status: Expired due to Fees
First Claim
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1. A band gap reference comprising:

  • an operational amplifier (opamp) having a (+) input, a (-) input, and an output;

    a first diode having a first terminal coupled to VSS, and a second terminal coupled to the (+) input of the opamp;

    a first current source transistor having a source to drain path coupling VDD to the second terminal of the first diode, and a gate coupled to the output of the opamp;

    a second diode having a first terminal coupled to VSS, and a second terminal;

    a first resistor having a first terminal coupled to the second terminal of the second diode, and a second terminal coupled to the (-) input of the opamp;

    a second current source transistor having a source to drain path coupling VDD to the second terminal of the first resistor, and a gate coupled to the output of the opamp;

    a third diode having a first terminal coupled to VSS, and a second terminal;

    a second resistor having a first terminal coupled to the second terminal of the third diode, and a second terminal providing the output of the band gap reference; and

    a third current source transistor having a source to drain path coupling VDD to the second terminal of the second resistor, and a gate coupled to the output of the opamp.

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