A/D example - MSB
Suppose VX = 21/32 (VH - VL ) and already sampled
Compare after shifting half of capacitance to VH
- VI goes up by + 8/16 (VH-VI) - 8/16 (VL-VI) = + 8/16 (VH - VL)
- original VL - VI goes down and becomes
- VL - ( VI + .5 (VH - VL) ) = VL - VI - .5 (VH - VL)