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DC & AC coupled E-field sensor

  • US 7,358,742 B2
  • Filed: 03/15/2006
  • Issued: 04/15/2008
  • Est. Priority Date: 10/30/2003
  • Status: Expired due to Fees
First Claim
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1. An E-field sensor comprising:

  • an E-field sensing antenna;

    a high input impedance amplifier having an input signal input, and an output signal output;

    means coupling the E-field sensing antenna to the input signal input to supply an input signal from the E-field sensing antenna to the input signal input while substantially limiting any bias current flow at the input signal input to thereby tend to create a DC offset in an output signal at the output signal output of the amplifier; and

    means for establishing a substantially DC reference signal coupled to the input signal from the E-field sensing antenna to produce a desired DC level on the input signal which affects operation of the amplifier to modify the DC offset in the output signal.

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