Continuous-Time ΣΔ modulators with VCO-Based voltage-to-phase and voltage-to-frequency quantizers

Author

Allam, Mootaz ; Aboushady, Hassan ; Louerat, Marie-Minerve

fYear

2010

Firstpage

676

Lastpage

679

Abstract

In this paper, two different VCO-Based quantizers architectures are implemented and compared as multi-bit quantizers of Continuous-Time (CT) Sigma-Delta (ΣΔ) modulator. The first one is the voltage-to-frequency while the second is the voltage-to-phase architecture. Two 4^th order CT-ΣΔ modulators are designed with Voltage-to-frequency and voltage-to-phase quantizers respectively. Both modulators are designed and simulated in 0.13μm technology. The comparision shows that voltage-to-phase quantizer remarkably reduces the VCO non-linearity and increases the modulator´s maximum SNR.

Keywords

modulators; quantisation (signal); sigma-delta modulation; voltage-controlled oscillators; VCO-based voltage-to-phase quantizers; continuous-time ΣΔ modulators; sigma-delta modulator; size 0.13 mum; voltage-to-frequency quantizers; voltage-to-phase architecture; voltage-to-phase quantizer; CMOS technology; Delay; Delta-sigma modulation; Frequency conversion; Multi-stage noise shaping; Quantization; Time domain analysis; Voltage; Voltage-controlled oscillators; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (MWSCAS), 2010 53rd IEEE International Midwest Symposium on

Conference_Location

Seattle, WA

ISSN

1548-3746

Print_ISBN

978-1-4244-7771-5

Type

conf

DOI

10.1109/MWSCAS.2010.5548917

Filename

5548917