Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1998-09-14
2000-10-31
Phan, Trong
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
H03M 300
Patent
active
061409510
ABSTRACT:
A .SIGMA..DELTA. digital/analog converter includes a signal reconstructing multirate low pass filter realized as a switched capacitor fully differential, double sampled structure. The input stage of the filter employs only two sampling capacitors, switched alternately on the two inputs of the stage. The input stage further includes two delay circuits (z.sup.-1) in the feed line of the bitstream towards one of the two inputs of the multistage SC filter. The zeroes introduced in the transfer function reduce the noise energy in the vicinity of frequencies f.sub.s /2.sup.n, preserving the SNR even with a relatively large mismatch between the capacitors.
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Nagari Angelo
Nicollini Germano
Galanthay Theodore E.
Phan Trong
STMicroelectronics S.r.l.
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