Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2008-07-29
2008-07-29
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S155000
Reexamination Certificate
active
07405687
ABSTRACT:
The invention relates to a continuous-time delta-sigma analog digital converter (10) for converting an analog input signal (IN) to a digital output signal (OUT), comprising an analog filter (20), which filters the analog input signal, a quantifier (30) cycled by a clock signal (CLK), which quantifier quantifies the filtered analog signal transmitted by the analog filter (20) to generate the digital output signal, and a feedback device (40) with at last one digital analog converter, which transmits at least one analog feedback signal based on the digital output signal (OUT) to the analog filter (20). To simplify the feedback without adversely affecting the converter stability and power consumption, provision is made, according to the invention, for the feedback device (40) for generating a feedback signal corresponding to the differentiated output signal of the quantifier, to comprise two digital analog converters (44-1, 44-2) to which the digital output signal (OUT) of the quantifier (30) is transmitted via a delay stage (42-1, 42-2) with different delays, and hose analog output signals are transmitted to an analog subtractor (24-3).
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Ebner Christian
Mitteregger Gerhard
Jean-Pierre Peguy
National Semiconductor Germany AG
Pearne & Gordon LLP
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