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:
Feb. 21, 2006
Filed:
Jul. 08, 2003
John B. Hughes, Hove, GB;
John B. Hughes, Hove, GB;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An current mode analogue-to-digital converter uses a conversion stage which operates using a two-phase clock and which requires the input signal to be present during only one of the phases. A sample-and-hold circuit () samples the input signal during the first clock phase and during the second clock phase a quantised bit value is generated from a mirror of the held input current by a kickback-free comparator circuit (). Also during the second clock phase a residue is generated using the quantised value and a non-mirrored version of the held input current. Optionally, two comparator circuits () may be used to provide two-level quantisation, enabling errors introduced by the current mirror to be corrected by a Redundant Signed Digit algorithm. Two pipelines of conversion stages (S', S″) can be multiplexed to double the conversion rate.