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Link between reference voltages and logic sections in 2.5bit ADC

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yefj

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Hello, for 2.5 bit ADC we have transitions at -0.625,-0.375,-0.125,0.125,0.375,0.625
So we have 6 opamps which means 6inner transitions, so we need 6 reference voltages.

Why in the circuit they use 3 reference voltages?
Thanks.

1601730210230.png

1601730486231.png
 

Maybe they play with the combinations among the voltages of the three muxes. Where is this slide from?
 

Hello Sutapanaki, I dont have a source.
Is there a way we can get 6 switching voltages from such stucture?
Thanks.
 

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