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Signal isolators using micro-transformers

  • US 8,736,343 B2
  • Filed: 03/31/2011
  • Issued: 05/27/2014
  • Est. Priority Date: 04/30/2003
  • Status: Active Grant
First Claim
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1. A method for providing an isolated logic output signal, comprising:

  • in response to receiving an input data signal, generating a first edge detection signal indicating a rising edge of the received input data signal and a second edge detection signal indicating a falling edge of the received input data signal, the first edge detection signal being different from the second edge detection signal;

    inputting the first and second edge detection signals to a primary winding of a transformer to transform the first and second edge detection signals from a first voltage to a second voltage, the first edge detection signal having a different pulse pattern than the second edge detection signal;

    inputting the transformed edge detection signals from a secondary winding of the transformer to a first input of a D-type flip-flop and to an input of a nonretriggerable edge triggered mono-stable multivibrator;

    outputting from the non-retriggerable edge triggered mono-stable multivibrator a logic signal to a second and third input of the D-type flip-flop, wherein the logic signal is representative of the pulse pattern of the first edge detection signal; and

    in response to an output from the D-type flip-flop, generating an output signal.

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