Patent ID: 9735794
Date: 2017-08-15
CPC Classifications: H03M

Claim:
1. A pipelined analog-to-digital converter device, comprising: a first stage comprising: a capacitive digital-to-analog converter including a capacitor comprised of a top plate and a bottom plate, the capacitive digital-to-analog converter sampling an analog input signal applied to the pipelined analog-to-digital converter device on the bottom plate of the capacitor while the top plate of the capacitor is grounded, holding the sampled analog input while the top plate is floated, and outputting a residue voltage; a first analog-to-digital converter coupled to the bottom plate of the capacitor, the first analog-to-digital converter producing a first digital representation of voltage on the bottom plate of the capacitor while the capacitor is grounded, wherein the first digital representation represents course bits produced by the first stage of the pipelined analog-to-digital converter device; and a second analog-to-digital converter coupled to the top plate of the capacitor, the second analog-to-digital converter producing a second digital representation of voltage on the top plate of the capacitor after the top plate is floated, wherein the second digital representation represents fine bits produced by the first stage of the pipelined analog-to-digital converter device.