Low noise, electric field sensor
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United States of America Patent
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Feb 3, 2004
Grant Date -
Aug 15, 2002
app pub date -
Feb 13, 2001
filing date -
Feb 13, 2001
priority date (Note) -
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Abstract
An electronic circuit stabilizes an ultrahigh input impedance amplifier by altering the amplifier's input potential. This input potential includes both the desired input signal and the amplifier's input bias current. With an amplifier having an input port and a guard, both the input port and the guard will have the same input potential. Accordingly, the stabilizing circuit of the present invention provides the input potential at the guard to an electronic device which separates the input signal from the input bias current. This creates a corrective signal. The corrective signal is then used through a feedback path to alter the input potential so that the desired input signal can be fed into the amplifier without adverse consequences from the input bias current.
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