Method and apparatus for providing stable voltage to analytical system
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United States of America Patent
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May 13, 2008
Grant Date -
Oct 19, 2006
app pub date -
Apr 15, 2005
filing date -
Apr 15, 2005
priority date (Note) -
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Abstract
An electrochemical cell has two terminals. One of the terminals is connected to a pulse-width-modulated (PWM) power supply and to a voltmeter. The other terminal is connected to circuitry capable of switching between amperometric and potentiometric measurement modes. A sequence of successive approximations permits selection of a PWM duty cycle giving rise to a desired voltage at the terminal connected with the power supply. In this way a stable excitation voltage is supplied to the cell even in the face of supply voltage instability or drift or instability in electronics coupled with the cell.
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