Systems and methods for reference settling
AssigneeSemiconductor Components Industries, LLC
InventorRajashekar Benjaram
Life of this patent
Estimating the term…
Abstract
An imaging system may include an image sensor. The image sensor may have an array of image pixels arranged in rows and columns. Each column of image pixels may be coupled to column readout circuitry via a corresponding column line. The column readout circuitry may include analog-to-digital conversion circuitry. The analog-to-digital conversion circuitry may include split MSB and LSB capacitor banks. The MSB capacitor bank may include capacitors selectively coupled to a coarse reference voltage or a fine reference voltage. The LSB capacitor bank may include capacitors electively coupled to the coarse reference voltage.
Claims8
Digital-to-analog conversion circuitry that receives an input signal, the digital-to-analog conversion circuitry comprising:
- a first plurality of capacitors associated with a first capacitor bank, wherein each capacitor in the first plurality of capacitors is configured to sample the input signal at a first terminal and to receive a selected one of a coarse reference voltage, a fine reference voltage, and an additional reference voltage at a second terminal, and wherein the first terminal of a given capacitor in the first plurality of capacitors is configured to receive an input voltage of the input signal using a sampling switch, and the second terminal of the given capacitor in the first plurality of capacitors is configured to selectively receive the coarse reference voltage using first and second switches and to selectively receive the fine reference voltage using the first switch and a third switch;
- and
- a second plurality of capacitors associated with a second capacitor bank, wherein each capacitor in the second plurality of capacitors is configured to sample the input signal at a first terminal and to receive a selected one of the coarse reference voltage and the additional reference voltage at a second terminal.
Dependencies are inferred from the claim text.