Title :
A structure of cascading multi-bit modulators without dynamic element matching or digital correction
Author :
Li, Bingxin ; Tenhunen, Hannu
Author_Institution :
LECS Lab., R. Inst. of Technol., Kista, Sweden
Abstract :
A new structure of cascading multi-bit Sigma Delta modulators is proposed in this paper. Using a multi-bit quantizer in each stage, the modulator´s performance is largely improved. Furthermore this structure does not require any dynamic element matching or digital correction circuit to attenuate the non-linearity error. This is because the modulator´s first stage uses a multi-bit quantizer, but only the most significant bit is used to generate the feedback. By this way the non-linearity error is eliminated. Simulation results are demonstrated with circuit non-idealities considered.
Keywords :
cascade networks; digital-analogue conversion; modulators; quantisation (signal); sigma-delta modulation; cascading multi-bit sigma delta modulators; digital correction circuit; dynamic element matching; gain mismatch; multi-bit quantizer; nonideality analysis; nonlinearity error; Circuits; Complexity theory; Delta modulation; Delta-sigma modulation; Digital modulation; Error correction; Noise shaping; Quantization; Sampling methods; Wideband;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010323