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Adding preamplifier based on simple inverter before latch stage can improve performance of comparator by decreasing offset voltage. Can anybody explain me how it works?
The inverters provide gain, so the input referred offset is reduced by a factor equal to the gain. For e.g. if the latch has 10mV offset and the inverter has a gain of 10, then you can resolve an input as low as 1mV.
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