DAC compensation for continuous-time delta-sigma modulators

Author

Tiew, Kei-Tee ; Chen, Yuan

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

fYear

2005

fDate

23-26 May 2005

Firstpage

3680

Abstract

This paper presents a novel compensation technique that compensates for the intersymbol interference and excess loop delay in the 1-bit feedback DAC of a continuous-time (CT) delta-sigma modulator (ΔΣM). The technique does not require a prior knowledge of the NRZ DAC output pulse in response to the input transition. As such, it could potentially compensate for most of the NRZ DAC nonidealities at high sampling frequency. A fourth-order bandpass continuous-time delta-sigma modulator is simulated to verify the effectiveness of the proposed DAC compensation technique.

Keywords

band-pass filters; circuit feedback; compensation; continuous time filters; delays; delta-sigma modulation; intersymbol interference; signal sampling; 1 bit; DAC compensation; NRZ DAC nonidealities; NRZ DAC output pulse; continuous-time ΔΣ modulators; continuous-time delta-sigma modulators; excess loop delay; feedback DAC; fourth-order bandpass continuous-time delta-sigma modulator; input transition; intersymbol interference; sampling frequency; Clocks; Delay; Delta modulation; Feedback; Frequency; Intersymbol interference; Jitter; Optical signal processing; Pulse modulation; Sampling methods;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on

Print_ISBN

0-7803-8834-8

Type

conf

DOI

10.1109/ISCAS.2005.1465428

Filename

1465428