Paper Info
Title
An Equivalent-Time Sampling Millimeter-Wave Ultra-Wideband Radar Pulse Digitizer in CMOS
Abstract
In designing a mm-wave ultra-wideband pulse-Doppler radar IC, one of the main challenges encountered is to reduce the high power consumption of the circuitries in the IC. A direct-RF receiver can be used in the radar’s design to reduce the radar’s power consumption. However, a digitizer that can directly digitize mm-wave ultra-wideband radar pulses is needed to implement such a receiver. This work presents the design of such a digitizer, which comprises several multi-pass sub-ADCs that operate together. Each multi-pass sub-ADC works fundamentally like a flash ADC but comprises one comparator only. A test chip containing a 6-bit prototype of the digitizer is fabricated in a 40 nm CMOS technology. The prototype consumes 19.7 mW when operated at 4 GSa/s and can operate with input signal frequencies of up to 64 GHz while achieving a −1.7/−6 dBFS <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">SNDR</i> of 21.1/22.8 dB at 60 GHz (the corresponding <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">FoM</i> is 532/434 fJ/c-s). The digitizer has a relatively high effective parallel-equivalent input impedance at 60 GHz, which, in a radar IC implementation, allows it to be driven with a relatively low power-consuming 60 GHz RF buffer. These are achieved without the digitizer being fabricated in a much more advanced technology node.
Year
DOI
Venue
2022
10.1109/TCSI.2022.3190141
IEEE Transactions on Circuits and Systems I: Regular Papers
Keywords
DocType
Volume
Analog-digital conversion,CMOS ADC,direct-RF sampling,equivalent-time sampling,millimeter wave radar,ultra wideband radar
Journal
69
Issue
ISSN
Citations 
10
1549-8328
0
PageRank 
References 
Authors
0.34
25
4
Name
Order
Citations
PageRank
Gibran Limi Jaya100.34
Chirn Chye Boon213626.81
Shoushun Chen317726.85
Liter Siek400.34