Sigma-delta converter and signal processing method

Details Sigma-delta converter and signal processing method Sigma-delta converter and signal processing method

2009-05-27

2010-12-28

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C375S246000

Reexamination Certificate

active

07859443

ABSTRACT:
A sigma-delta converter comprises a sigma-delta modulator (SDM) with a signal processing block (SP) and a quantizer (QNT), as well as a stage adaptation element (DCC). The signal processing block (SP) is designed for deriving a modulated signal (MOD) in dependence on the respective signals at a signal input (SIN) and at a feedback input (FIN). The quantizer (QNT) comprises a quantization input (QIN) that is coupled to the signal output (SOT) and a quantization output (QOT) that is coupled to the feedback input (FIN), wherein the quantizer is designed for deriving a first quantized signal (Q1) from the modulated signal (MOD) by quantization with a first number of stages and for outputting this first quantized signal at the quantization output (QOT). The stage adaptation element is coupled to the quantization output (QOT) on the input side and to a converter output (COT) on the output side and is designed for deriving a second quantized signal (Q2) with a second number of stages that is smaller than the first number of stages from the first quantized signal (Q1).

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