Tiger_ITRI
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Hi,aaron_do: You may search about "ADC driver" for this topic. Fully differential, small input/output signal, wait until sc is settled and sampled, small resistance for low noise or just apply sc circuit, negative feedback ...are the ideas to help to improve linearity. You need to drive a sc circuit , so you can estimate the load's equivalent resistance you drived, if power consumption is not a design issue, use class-A as output stage is fine or class-AB, class-AB have high gain, high driving capibility, low quiescent current but more noise compared to class-A. The SNR for 14-bit design is need very careful, layout mismatch is an issue in this task. By the way, to measurement such high linearity circuit, good pcb layout and sheilding techniques also a pre-consider matter, althogh there are many instrument can measure such SNR, but the good measurement enviroment is still remain to the designer. Too talkive~ anyway search about "linearity" "ADC driver datasheet", you will find out more.
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