Name
Title | ||
|---|---|---|
A 12 MHz BW, 80 dB SNDR, 83 dB DR, 4<sup>th</sup> order CT-ΔΣ modulator with 2<sup>nd</sup> order noise-shaping and pipelined SAR-VCO based quantizer |
Abstract | ||
|---|---|---|
A 2
<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup>
order noise shaping, SAR-VCO based hybrid quantizer is introduced. The SAR quantization error is available as a residue voltage at the end of the SAR conversion. This residue voltage is input to the VCO quantizer. Thus, the non-linear VCO quantizer does not generate harmonic distortion and the hybrid quantizer exhibits high linearity. The SAR and VCOQ operate in a pipeline to reduce excess-loop-delay when used in a ΔΣ loop. This enables high sampling frequencies. By using this SAR-VCO quantizer in a 2
<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup>
order ΔΣ loop, 4
<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup>
order noise shaping is achieved using only two O TA-RC integrators. The ΔΣ modulator exhibits robust performance against gain mismatches between the SAR path and the VCO path in the quantizer. The prototype modulator fabricated in a 65 nm CMOS process operates at 600 MHz sampling frequency and achieves 84 dB SFDR, 83 dB DR and peak SNR/SNDR of 82.26/80 dB for a 12 MHz signal bandwidth. The resulting FOMw is 84.12 fJ/conv-step and FOM
<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">S-SNDR</sub>
is 168.6 dB. |
Year | DOI | Venue |
|---|---|---|
2019 | 10.1109/CICC.2019.8780200 | 2019 IEEE Custom Integrated Circuits Conference (CICC) |
Keywords | DocType | ISSN |
SAR quantization error,SAR conversion,nonlinear VCO quantizer,ΔΣ loop,CT-ΔΣ modulator,2nd order noise-shaping,pipelined SAR-VCO based hybrid quantizer,harmonic distortion,OTA-RC integrators,CMOS process,frequency 12.0 MHz,frequency 600.0 MHz | Conference | 0886-5930 |
ISBN | Citations | PageRank |
978-1-5386-9396-4 | 0 | 0.34 |
References | Authors | |
4 | 3 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Siladitya Dey | 1 | 2 | 1.37 |
| Kartikeya Mayaram | 2 | 349 | 58.50 |
| Terri S. Fiez | 3 | 167 | 47.25 |