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  1. #1
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    question about this Rx circuit

    1)why use a bunch of Capactior as offset for something? Does that increase load and timing?

    2)what's advanatge of using two staged differential Amp like this?

    3)I cannot tell what's the actual load of the Out. crossed inverter and there's a clokc in between? and there's clk outside of that. what's purpose of that?

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  2. #2
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    Dominik Przyborowski's Avatar
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    Re: question about this Rx question.

    This is a typical strong arm dynamic latched comparator with preamplifier - there is a huge number of papers/textbooks threated on it.

    In short: preamplifier is used to reduce kick-back from latch to input, capacitors are used to trim dynamic offset. Offset is caused by unequal capacitances at drains of 2nd stage input pair (caused by mismatch and parasitics). During comparison stage (when CLK signal is high), drain nodes of input pair are charged and basing on this charge, latch "makes a decision" to set proper output values.


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