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. 03, 2004
Filed:
Mar. 16, 2000
Patrik Larsson, Matawan, NJ (US);
Christopher John Nicol, West Pymble, AU;
Agere Systems, Inc., Allentown, PA (US);
Abstract
A partial carry-save format is employed for a finite impulse response filter output representation, thereby reducing a number of flip-flops and hence power. By replacing the least significant bit processing section on the output side of the finite impulse response filter with a combined carry-save adder and carry-propagate adder followed by a register rather than two flip-flops, the load on the clock can be reduced, thereby achieving reduced propagation delay. To further improve the performance of the finite impulse response filter, a simpler carry-save adder is employed in the least significant bit section, which is possible due to the use of a single register at an input to each of the carry-save adders rather than two flip-flops, one for a carry output and one for a sum output from the adder. The combination of a reduction of half of the flip-flops and a replacement of a simpler carry-save adder for each of the carry-save adders results in a significant improvement in the overall filter performance and power and space consumption.