This paper presents the design of a 5 bit VCO quantizer with an alternative flipped cross-coupled delay element providing low KV nonlinearities compared to the commonly used current starved inverter delay element. The VCO is demonstrated within a third order continuous time (CT) delta sigma (?Sigma) modulator operating at an fS of 1 GHz with an OSR of only 10 . In using the frequency output of the VCO, fourth order noise shaping is present but with the stability of a third order multi-bit loop-filter. The schematic based VCO achieves a 50 dB linearity and 44.5 dB SNDR within a 50MHz bandwidth (BW) which provides 73.5 dB SNDR performance of the third order modulator with a frequency output VCO quantizer.
Description
Design of a 5bit 1GSps VCO Quantizer for a CT Delta Sigma Modulator - VDE Conference Publication
%0 Conference Paper
%1 6226117
%A Kauffman, J. G.
%A Rieger, V.
%A Ritter, R.
%A Anders, J.
%A Ortmanns, M.
%B PRIME 2012; 8th Conference on Ph.D. Research in Microelectronics Electronics
%D 2012
%K sigma quantizer delta modulators from:jens.anders
%P 1-4
%T Design of a 5bit 1GSps VCO Quantizer for a CT Delta Sigma Modulator
%U https://ieeexplore.ieee.org/document/6226117
%X This paper presents the design of a 5 bit VCO quantizer with an alternative flipped cross-coupled delay element providing low KV nonlinearities compared to the commonly used current starved inverter delay element. The VCO is demonstrated within a third order continuous time (CT) delta sigma (?Sigma) modulator operating at an fS of 1 GHz with an OSR of only 10 . In using the frequency output of the VCO, fourth order noise shaping is present but with the stability of a third order multi-bit loop-filter. The schematic based VCO achieves a 50 dB linearity and 44.5 dB SNDR within a 50MHz bandwidth (BW) which provides 73.5 dB SNDR performance of the third order modulator with a frequency output VCO quantizer.
@inproceedings{6226117,
abstract = {This paper presents the design of a 5 bit VCO quantizer with an alternative flipped cross-coupled delay element providing low KV nonlinearities compared to the commonly used current starved inverter delay element. The VCO is demonstrated within a third order continuous time (CT) delta sigma (?Sigma) modulator operating at an fS of 1 GHz with an OSR of only 10 . In using the frequency output of the VCO, fourth order noise shaping is present but with the stability of a third order multi-bit loop-filter. The schematic based VCO achieves a 50 dB linearity and 44.5 dB SNDR within a 50MHz bandwidth (BW) which provides 73.5 dB SNDR performance of the third order modulator with a frequency output VCO quantizer.},
added-at = {2020-10-12T15:41:06.000+0200},
author = {{Kauffman}, J. G. and {Rieger}, V. and {Ritter}, R. and {Anders}, J. and {Ortmanns}, M.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/240771ccb29112334ec6a226ddb1f945f/iis},
booktitle = {PRIME 2012; 8th Conference on Ph.D. Research in Microelectronics Electronics},
description = {Design of a 5bit 1GSps VCO Quantizer for a CT Delta Sigma Modulator - VDE Conference Publication},
interhash = {1a195cacaaf913971e26c11b1cef3008},
intrahash = {40771ccb29112334ec6a226ddb1f945f},
keywords = {sigma quantizer delta modulators from:jens.anders},
month = {June},
pages = {1-4},
timestamp = {2020-10-12T13:41:06.000+0200},
title = {Design of a 5bit 1GSps VCO Quantizer for a CT Delta Sigma Modulator},
url = {https://ieeexplore.ieee.org/document/6226117},
year = 2012
}
