Sigma-delta ADC, not only has adopted the technology of oversampling, but also utilized noise shaping which modulate the quantization noise in the baseband to the high frequency area. It increases the SNR in baseband and the effective quantization number of the converter. Because of the modulation technology, it makes sigma-delta ADC allowed to use one bit comparator, in addition Conventional N...

One of the greatest unsolved problems in the theory of sigma delta modulation concerns the ability to analytically derive the stability, or boundedness, of a high order sigma delta modulator (SDM). In this work, we describe the existing literature and try to clarify the issues involved. We fully derive the stability of first order sigma delta modulators, and derive some important results for th...

In this paper, an Adaptive Delta-Sigma based architecture for High Dynamic Range (HDR) Focal Plane Arrays is presented. The noise shaping effect of the Delta-Sigma modulation in the low end, and the distortion noise induced in the high end of Photo-diode current were analyzed in detail. The proposed architecture can extend the DR for about 20N log2 dB at the high end of Photo-diode current with...

Sigma-Delta modulation techniques have been applied to narrow-band passband signals [Jantzi93]. Recent technology improvement has allowed conversion of GSM channels [Ong97] and DECT channels[Bazarjiani97]. In this report, the main concept behind BandPass Sigma-Delta conversion is briefly explained together with its advantages and applications. The architecture choices for this design are then d...

[1] I. Bietti, E. Ternporitil, G. Albasini, and R. Castello, “An UMTS sigma delta fractional synthesizer with 200 kHz bandwidth and 128 dBc/Hz at 1 MHz using spurs compensation and linearization techniques,” in Proc. IEEE Custom Integrated Circuits Conf., Sep. 2003, pp. 463–466. [2] S. Pamarti, L. Jansson, and I. Galton, “A wideband 2.4-GHz delta-sigma fractional-N PLL with 1-Mb/s in-loop modul...

The paper proposes a novel structure for a MASH digital delta-sigma modulator (DDSM) in order to achieve a long sequence length. The expression for the sequence length is derived. The condition to produce the maximum sequence length is also stated. It is proved that the modulator output only depends on the structure of the first-order error feedback modulator (EFM1) which is the first stage of ...

In this thesis, our main focus is Sigma-Delta quantization schemes. These are commonly used in state-of-art Analog-to-digital conversion technology. Their main advantage is the ease of implementation and more importantly their insensitivity to certain circuit imperfections. When we compare sigmadelta scheme with pulse-code modulation (PCM), sigma-delta is inferior in terms of rate distortion be...

The three most important factors in choosing a speech output processing method for a particular application are flexibility, bit rate and cost. Flexibility enables the user to change the binary speech patterns according to his needs; bit rate is the amount of binary information necessary to produce a certain length (I s) of continuous speech; and cost includes not only the LSl chip itself, but ...

Sigma delta modulation M has become a widespread method of analogue to digital conversion however its operation has not been completely de ned The majority of the analysis carried out on the circuit has been from a linear standpoint with non linear analysis hinting at hidden complexities in the modulator s operation The sigma delta modulator itself is a non linear system consisting as it does o...