LMC6462_14 Datasheet, PDF (21/32 Pages) National Semiconductor (TI) – LMC6462 Dual/LMC6464 Quad Micropower, Rail-to-Rail Input and Output CMOS

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Then,
= 1 Hz
Low Frequency Null
LMC6462, LMC6464
SNOS725D – MAY 1999 – REVISED MARCH 2013
(7)
(8)
Figure 56. High Gain Amplifier with Low Frequency Null
Output offset voltage is the error introduced in the output voltage due to the inherent input offset voltage V_OS, of
an amplifier.
Output Offset Voltage = (Input Offset Voltage) (Gain)
In the above configuration, the resistors R₅ and R₆ determine the nominal voltage around which the input signal,
V_IN should be symmetrical. The high frequency component of the input signal V_IN will be unaffected while the low
frequency component will be nulled since the DC level of the output will be the input offset voltage of the
LMC6462 plus the bias voltage. This implies that the output offset voltage due to the top amplifier will be
eliminated.
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