×

Systems and methods for starting up analog circuits

  • US 9,667,240 B2
  • Filed: 03/28/2012
  • Issued: 05/30/2017
  • Est. Priority Date: 12/02/2011
  • Status: Active Grant
First Claim
Patent Images

1. A startup circuit, comprising:

  • an output node at an output voltage (VOUT);

    an operational amplifier coupled to the output node;

    a comparator comprising a first input configured to be coupled to a reference voltage (VREF), a second input, and an output;

    a feedback loop coupling the output node to the second input; and

    a turbo circuit coupled between the output and the output node and configured to be coupled to a supply voltage (VPWR), the turbo circuit is configured to increase VOUT, wherein;

    the comparator is configured to compare VOUT and VREF, the turbo circuit is disabled when the VOUT at the output node is within a predetermined voltage of the VREF, the operational amplifier starts up when the VOUT at the output node is outside the predetermined voltage of the VREF, and the operational amplifier drives a load that is coupled to the output node.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×