Title :
An audio band low voltage CT-ΔΣ modulator with VCO-based quantizer
Author :
Yousefzadeh, Bahman ; Sharifkhani, Mohammad
Author_Institution :
Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran
Abstract :
This paper presents the design and implementation of a low power, low voltage, continuous time delta sigma modulator for audio band in 90 nm CMOS technology. A VCO-based integrator and quantizer are used. Inherent dynamic element matching (DEM) of the quantizer eliminates the need for explicit DEM logic which results in a short excess-delay and power saving. Simulation results show that the modulator achieves 78 dB SNDR and 87 dB SNR in a 20 kHz input bandwidth and dissipates 106 μW from 1 V supply. The power consumption for different parts is discussed.
Keywords :
CMOS integrated circuits; delta-sigma modulation; integrated circuit design; low-power electronics; voltage-controlled oscillators; CMOS technology; DEM logic; VCO-based integrator; VCO-based quantizer; audio band low voltage CT-ΔΣ modulator; bandwidth 20 kHz; dynamic element matching logic; low power low voltage continuous time delta sigma modulator; noise figure 78 dB; noise figure 87 dB; power 106 muW; power consumption; size 90 nm; voltage 1 V; Bandwidth; Delay; Integrated circuit modeling; Modulation; Signal to noise ratio; Voltage-controlled oscillators;
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2011 18th IEEE International Conference on
Conference_Location :
Beirut
Print_ISBN :
978-1-4577-1845-8
Electronic_ISBN :
978-1-4577-1844-1
DOI :
10.1109/ICECS.2011.6122256
