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                                       Details for article 2 of 5 found articles
 
 
  A wideband cascaded sigma-delta modulator with improved nonlinearity effects
 
 
Title: A wideband cascaded sigma-delta modulator with improved nonlinearity effects
Author: Chiang, Jen-Shiun
Chou, Pao-Chu
Chang, Teng-Hung
Appeared in: International journal of electronics
Paging: Volume 90 (2003) nr. 4 pages 255-275
Year: 2003-04
Contents: This work presents a wideband cascaded sigma-delta modulator (CLFSDM) that reduces the nonlinearity effects of components. This architecture offers a new noise-shaping function to achieve high resolution in wideband applications and reduce digital-analogue converter (DAC) mismatch from the multi-bit feedback. Moreover, the error cancellation schemes can be added in the digital circuit part to cancel the coarse quantization errors and thus effectively reduce the non-ideal effects such as DAC mismatch. The mismatches between the two stages, such as in the gain error and pole error, may seriously degrade performance. The blind on-line calibration technique is used to eliminate these imperfect analogue circuit errors in the digital circuit. Accordingly, this architecture can reduce the over sampling ratio (OSR), and the in-band noise can be significantly suppressed to achieve a high resolution in Matlab and Switcap2 simulations. Simulation results indicate this sigma-delta modulator is very efficient in wide bandwidth applications.
Publisher: Taylor & Francis
Source file: Elektronische Wetenschappelijke Tijdschriften
 
 

                             Details for article 2 of 5 found articles
 
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