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:
Nov. 06, 2001
Filed:
Sep. 27, 1999
U.S. Philips Corporation, New York, NY (US);
Abstract
A current mode pipelined analogue to digital converter (ADC) has a plurality of serially connected conversion stages. Each conversion stage has an input (,) for receiving a sampled and held current which is connected via a switch (S,) to a first current memory (M,) and via a switch (S,) to a second current memory (M,). The output of the second current memory (M,) is fed via a switch (S,) to one input of a summing junction (,). The output of the first current memory (M,) is fed via a switch (S,) to the input of a comparator (L,) whose output is clocked into a latch (L,) whose Q output is connected to an output (,) as the digital result of the conversion. The Q output of the latch (L,) is also connected to a digital to analogue converter (,) whose analogue output is fed to a second input of the summing junction,via a switch (S,) to form the analogue residue signal for application via output (,) to the next conversion stage in the pipeline. The stage has the advantage that the analogue signal is fed from stage to stage using only one current memory (M,) thus reducing transmission loss and that corruption of the analogue signal by comparator “kick back” is avoided by using a further current memory (M,) in parallel with the signal path current memory (M,).