High resolution Frequency-based Delta-Sigma Modulator utilizing multi-phase quantizer

Author

Cao, Tuan-Vu ; Wisland, Dag T. ; Lande, Tor Sverre

Author_Institution

Univ. of Oslo, Oslo, Norway

fYear

2012

fDate

20-23 May 2012

Firstpage

3009

Lastpage

3012

Abstract

In this paper, a design of the first-order Frequency-based Delta-Sigma Modulator (FDSM) utilizing multi-phase quantizer is presented. The VCO (Voltage-Controlled Oscillator) which behaves as a voltage-to-phase integrator will be proposed to generate multiple output phases. Each phase output from the VCO drives a counter using the proposed CMSA-FF (Current-Mirror Sense-Amplifier Flip-Flop), producing a total counted number of phase transitions higher than the single-phase FDSM. This will help to significantly improve the FDSM resolution. The circuits are designed using a TSMC 90nm CMOS process.

Keywords

CMOS integrated circuits; current mirrors; delta-sigma modulation; flip-flops; voltage-controlled oscillators; CMSA-FF; TSMC CMOS process; VCO; current-mirror sense-amplifier flip-flop; first-order frequency-based delta-sigma modulator; high resolution frequency-based delta-sigma modulator; multiphase quantizer; single-phase FDSM; voltage-controlled oscillator; voltage-to-phase integrator; Clocks; Delay; Frequency modulation; Noise; Transistors; Tuning; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2012 IEEE International Symposium on

Conference_Location

Seoul

ISSN

0271-4302

Print_ISBN

978-1-4673-0218-0

Type

conf

DOI

10.1109/ISCAS.2012.6271951

Filename

6271951