Title :
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
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;
Conference_Titel :
Circuits and Systems (ISCAS), 2012 IEEE International Symposium on
Conference_Location :
Seoul
Print_ISBN :
978-1-4673-0218-0
DOI :
10.1109/ISCAS.2012.6271951
