DocumentCode :
1424248
Title :
A Continuous Time Multi-Bit 
ADC Using Time Domain Quantizer and Feedback Element
Author :
Dhanasekaran, Vijay ; Gambhir, Manisha ; Elsayed, Mohamed M. ; Sánchez-Sinencio, Edgar ; Silva-Martinez, Jose ; Mishra, Chinmaya ; Chen, Lei ; Pankratz, Erik J.
Author_Institution :
Qualcomm, San Diego, CA, USA
Volume :
46
Issue :
3
fYear :
2011
fDate :
3/1/2011 12:00:00 AM
Firstpage :
639
Lastpage :
650
Abstract :
A third-order CT ΔΣ ADC that replaces the multi-bit quantizer and feedback DAC by a pulsewidth modulation (PWM) generator and time-to-digital converter (TDC) is implemented in 65 nm CMOS technology. The TDC provides a 50-level binary output code and a time-quantized feedback pulse to the modulator. It is shown that the TDC can achieve 11 bit linearity in time steps without calibration or dynamic element matching. The modulator achieves 68 dB DR in 20 MHz BW, consumes 10.5 m W and occupies 0.15 mm2.
Keywords :
PWM power convertors; analogue-digital conversion; continuous time systems; time-varying networks; bandwidth 20 MHz; binary output code; continuous time multi-bit ADC; feedback element; power 10.5 mW; pulsewidth modulation generator; time domain quantizer; time-quantized feedback pulse; time-to-digital converter; ADC; TDC; analog-to-digital conversion; baseband ADC; continuous time; deep-submicron CMOS; delta-sigma modulator; low OSR; nanometric CMOS; oversampling; time domain; time-to-digital; time-to-digital converter;
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/JSSC.2010.2099893
Filename :
5686879
Link To Document :
