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