A 2-1 cascaded hybrid continuous-discrete time sigma-delta modulator

Author

Ducu, Dragos George ; Manolescu, Anca

Author_Institution

Microchip Technol., MCHP, Bucharest, Romania

fYear

2014

Firstpage

27

Lastpage

30

Abstract

This paper describes a new 2-1 cascaded hybrid sigma delta modulator where the discrete time filter is realized with fully differential current conveyor. The hybrid convertor, which is a combination of an analog integrator and two digital integrators, offers an increased dynamic range, helps make the resulting high-order sigma delta modulator stable and reduce power consumption comparing with discrete time realization for the same topology. The convertor has been designed in a 0.18um TSMC technology and achieves a maximum signal to noise ratio 87dB in a 500 KHz bandwidth and dissipates 34mW at 1.8V power supply.

Keywords

cascade networks; continuous time filters; current conveyors; discrete time filters; logic design; low-power electronics; power consumption; sigma-delta modulation; TSMC technology; analog integrator; cascaded hybrid continuous-discrete time sigma-delta modulator; differential current conveyor; digital integrators; discrete time filter; frequency 500 kHz; high-order sigma delta modulator; hybrid convertor; power 34 mW; power consumption; power supply; signal-to-noise ratio; size 0.18 mum; voltage 1.8 V; Bandwidth; Capacitors; Converters; Modulation; Noise; Power demand; Sigma-delta modulation; Cascaded Sigma Delta; Continuous Time; Discrete Time; Hybrid Convertor; Modulator;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Computers and Artificial Intelligence (ECAI), 2014 6th International Conference on

Print_ISBN

978-1-4799-5478-0

Type

conf

DOI

10.1109/ECAI.2014.7090142

Filename

7090142