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. 06, 1997
Filed:
Jan. 04, 1995
Michel Ferry, Vallauris, FR;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A convolutional digital to analog converter (CDAC) according to the present invention enables to apply the convolution operation between the digital input signals and the Fourrier transform of a filtering transfer function. This convolution operation is combined with interleaved sampling performed by a clock splitter and also a multiplier generator device. In more details, the present convolutional DAC comprises a device splitting the incoming data for deserializing them and for sorting and storing the data in the respective N data buffers, a device splitting the clock signal (Fb) of the CDAC into N signals having a frequency equal to Fb/N clocking the respective data buffer, N multiplying DAC receiving data from the corresponding data buffer through a corresponding data bus, and N multiplier generators using identical periodic functions and being shifted by a delay respective to each other according to the clock splitter for generating the function to be convoluted with the digital inputs in the respective multiplying DACs. Second and third order for which N is equal to 1 and 2 of the convolutional DAC according to the present invention are described in detail in the description.