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Manual or automatic nulling DC offset for physiological DC amplifier
1Occupational Health and Rehabilitation Institute, Loewenstein Hospital, Raanana, Israel.
Medical Engineering & Physics
|March 1, 1994
Abstract:
An inexpensive circuit to compensate for DC offset is presented. The circuit may be connected in a straightforward manner to any currently existing DC isolation amplifier and causes no deterioration in the performance of the system. The offset voltage is measured at discrete time intervals and then subtracted from the input signal. A switch is provided to bypass the offset compensation when the latter is not required.