Title :
A 110-dB Dynamic Range, 76-dB Peak SNR Companding Continuous-Time ?S Modulator for Audio Applications
Author :
Kumar, Saravana ; Chatterjee, Shouri
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Technol. Delhi, New Delhi, India
Abstract :
This paper presents a companding continuous-time ΔΣ ADC for audio applications. The 3rd-order modulator uses a 3-bit companding quantizer and has an over sampling rate of 64. The companding quantizer is implemented by a log amplifier followed by a flash ADC. The modulator, in simulation, achieves a peak signal-to-noise ratio of 76 dB, a dynamic range of 110 dB in a 24 kHz bandwidth and dissipates 860 μW of power.
Keywords :
amplifiers; analogue-digital conversion; delta-sigma modulation; 3rd-order modulator; audio application; bandwidth 24 kHz; companding continuous-time ΔΣ ADC; companding quantizer; dynamic range peak SNR companding continuous-time ΔΣ modulator; flash ADC; log amplifier; noise figure 110 dB; noise figure 76 dB; peak signal-to-noise ratio; power 860 muW; power dissipation; word length 3 bit; Dynamic range; MOS devices; Modulation; Quantization; Resistors; Signal to noise ratio; ADC; companding; delta-sigma;
Conference_Titel :
VLSI Design (VLSID), 2012 25th International Conference on
Conference_Location :
Hyderabad
Print_ISBN :
978-1-4673-0438-2
DOI :
10.1109/VLSID.2012.45
