Title :
Design of Baseband Digital Delta-Sigma Modulators in 180nm CMOS
Author :
Varona, Jorge ; Velazquez, Ramiro ; Tecpoyotl Torres, Margarita
Author_Institution :
Univ. Panamericana, Aguascalientes, Mexico
Abstract :
This article presents a 3rd Order 1-bit ΔΣ modulator optimized for applications requiring high effective resolution and linearity within the 20-kHz band. Furthermore, this work also describes architectural approaches for designing modulators with different order, oversampling rate, and number of quantization bits. Such approaches can be leveraged in a variety of applications in digital signal processing for data communications, filters, motor controllers, data acquisition, high-fidelity audio, DACs, and others operating in baseband. The 3rd Order modulator was implemented in standard 180nm CMOS; experimental measurements show a SNDR=126dB equivalent to 20-bits of effective resolution with a total harmonic distortion THD=0.03%. The circuit is able to operate in low-voltage conditions from 0.55 to 1.8 Volts.
Keywords :
CMOS digital integrated circuits; delta-sigma modulation; low-power electronics; signal processing; 3rd order 1-bit ΔΣ modulator; CMOS; DAC; bandwidth 20 kHz; baseband digital delta-sigma modulators; data acquisition; data communications; digital signal processing; filters; high- fidelity audio; low-voltage conditions; motor controllers; oversampling rate; quantization bits; size 180 nm; total harmonic distortion; voltage 0.55 V to 1.8 V; word length 1 bit to 20 bit; Baseband; CMOS integrated circuits; Digital signal processing; Hardware; Modulation; Multi-stage noise shaping; Signal to noise ratio; CMOS circuits; Delta-Sigma Modulation; Digital Signal Processing (DSP); low voltage;
Journal_Title :
Latin America Transactions, IEEE (Revista IEEE America Latina)
DOI :
10.1109/TLA.2015.7111979
