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Waveform generator electronics based on tuned LC circuits

  • US 7,078,678 B2
  • Filed: 09/23/2003
  • Issued: 07/18/2006
  • Est. Priority Date: 09/25/2002
  • Status: Expired due to Term
First Claim
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1. An apparatus for generating a periodically varying electrical signal for creating a periodically varying electrical field between electrodes of an ion mobility spectrometer, comprising:

  • an output port;

    a first tuned circuit for being electrically coupled to an external power source and for, in isolation, providing a first periodically varying electrical signal having a first frequency, the first tuned circuit coupled to the output port for providing an output electrical signal having a component at the first frequency thereto; and

    ,a second tuned circuit for being electrically coupled to an external power source and for providing a second periodically varying electrical signal having a second frequency different from the first frequency, the second tuned circuit coupled to the first tuned circuit for adding a component at the second frequency to the output electrical signal.

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