Title :
A comparator with reduced regeneration time for continuous-time delta-sigma modulator
Author :
Hi Yuen Song ; So Young Kang ; Dongmin Kang ; Hyunseok Choi ; Inn Yeal Oh ; Chul Soon Park
Author_Institution :
Dept. of Electr. Eng., KAIST, Daejeon, South Korea
Abstract :
A design of a comparator with reduced regeneration time and down scaling voltage for continuous-time delta-sigma modulators (CT DSM) was proposed. It has voltage scaling down to 0.65 V, and gives worst case delay under 10%Ts (i.e. 125 ps for 800 MHz sampling frequency) at 1.2 V supply voltage. A 3rd order low pass CT DSM employing the proposed comparator achieves 50.76 dB of SNDR and 3.2 MHz bandwidth, which are 5.2 dB higher and 3.2 times wider than those of a 3rd order low pass CT DSM employing the reference comparator, respectively.
Keywords :
UHF circuits; comparators (circuits); delta-sigma modulation; network synthesis; reference circuits; 3rd order low pass CT DSM; bandwidth 3.2 MHz; continuous-time delta-sigma modulator; down scaling voltage; frequency 800 MHz; noise figure 5.2 dB; noise figure 50.76 dB; reduced regeneration time; reference comparator; time 125 ps; voltage 0.65 V; voltage 1.2 V; Bandwidth; Clocks; Conference proceedings; Delays; Modulation; Noise; Transistors; ΔμADC; CT DSM; comparator; continuous-time; delay; delta-sigma modulator; excess loop delay; regeneration time;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2013 Asia-Pacific
Conference_Location :
Seoul
DOI :
10.1109/APMC.2013.6694922
