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comparator diff pair (Read 3644 times)

newic Senior Member Offline Posts: 138	comparator diff pair Aug 19^th, 2014, 7:23am hi For a analog type comparator, shall the diff pair in saturation or linear? If it is in saturation, it causes its size bigger and slow down the speed, where speed is important. tradeoff between gain vs speed?
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aaron_do Senior Fellow Offline Posts: 1398	Re: comparator diff pair Reply #1 - Aug 19^th, 2014, 7:32am Perhaps you should clarify what you mean by "analog comparator". Is the output latched? Is the differential pair directly connected to the latch or is it part of the pre-amp? Aaron
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loose-electron Senior Fellow Offline Best Design Tool = Capable Designers Posts: 1638 San Diego California	Re: comparator diff pair Reply #2 - Aug 19^th, 2014, 6:04pm generally you want the device to function as an amplifier with common mode rejection. Therefor in saturation.
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carlgrace Senior Member Offline Posts: 231 Berkeley, CA	Re: comparator diff pair Reply #3 - Aug 19^th, 2014, 10:38pm OP didn't say if the comparator was dynamic of if the diff pair was a pre-amp in front of the latch. Changes the answer. Unless you know what you're doing though, a linear amplifier in front of the latch is usually a good idea.
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newic Senior Member Offline Posts: 138	Re: comparator diff pair Reply #4 - Aug 24^th, 2014, 12:45am got it thx. but it slow down the speed.
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analog_rf Junior Member Offline Posts: 15 Universe	Re: comparator diff pair Reply #5 - Sep 26^th, 2014, 3:39am putting input transistors in linear will lessen your resolution(difference between inputs for which output is high).
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