Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2006-10-10
2006-10-10
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S144000
Reexamination Certificate
active
07119725
ABSTRACT:
A sigma-delta modulator comprises a summer, a loop filter, a quantizer, a D/A converter and a dynamic element matching logic. The summer receives an analog input signal and a feedback signal to generate an error signal to the loop filter which generates a filtered signal to the quantizer, thereby converting the filtered signal to a quantized output signal to the D/A converter including first and second converting elements which together form a plurality of D/A elements and generating the feedback signal. The dynamic element matching logic selects the D/A elements and determines the number of groups into which the D/A elements are divided, where the number of the groups is prime to that of the first converting elements, distributes the D/A elements to each group equally, and selects the groups and D/A elements thereof according to the quantized output signal and the previous selection of groups and D/A elements.
REFERENCES:
patent: 6515607 (2003-02-01), Liu et al.
patent: 6677875 (2004-01-01), Dagher et al.
patent: 6864819 (2005-03-01), Wang
patent: 6956514 (2005-10-01), Melanson et al.
Faraday Technology Corp.
Hsu Winston
Jean-Pierre Peguy
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