The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 2015
Filed:
Jun. 03, 2014
Cmosis Bvba, Antwerp, BE;
Bram Wolfs, Nieuwrode, BE;
CMOSIS BVBA, Antwerp, BE;
Abstract
An analog-to-digital conversion apparatuscomprises a plurality of analog-to-digital convertersand a ramp generator. Each of the analog-to-digital converterscomprises an analog signal input for receiving an analog signal level and a ramp signal input. A control stage is arranged to compare the ramp signal with the analog signal level and, based on the comparison, to enable a counter provided at the analog-to-digital converter or to latch a digital value received from a counter. The control stage comprises a comparator in the form of a first differential amplifier with a first branch connected to the input for receiving the ramp signal, a second branch connected to the analog signal input and an output, and a biasing current source for biasing the first differential amplifier. A feedback circuit controls the biasing current source. The feedback circuit comprises a second differential amplifier OPwith a first input connected to a nodeon the first branch and a second input connected to a reference voltage VB such that the node on the first branch is maintained at a substantially constant voltage.