Broadband Direct RF Digitization Receivers

175 Pages·2014·5.14 MB·English

by  Olivier Jamin (auth.)

ACSP · Analog Circuits and Signal Processing
Olivier Jamin
Broadband
Direct RF
Digitization
Receivers
ANALOG CIRCUITS AND SIGNAL
PROCESSING
Series Editors
Mohammed Ismail, The Ohio State University
Mohamad Sawan, E´cole Polytechnique de Montre´al
For furthervolumes:
http://www.springer.com/series/7381

Olivier Jamin
Broadband Direct RF
Digitization Receivers
OlivierJamin
NXPSemiconductors
CampusEffiscience,2EsplanadeAntonPhilips
BP20000,14906Caencedex9,France
[email protected]
ISBN978-3-319-01149-3 ISBN978-3-319-01150-9(eBook)
DOI10.1007/978-3-319-01150-9
SpringerChamHeidelbergNewYorkDordrechtLondon
LibraryofCongressControlNumber:2013944572
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Louis, Martin et Fe´lix

Preface
Context
Digital communications have evolved to meet the demand of consumers for
increasingaccesstoInternetbrowsing,TV, VideoonDemand,interactivegames,
andsocialnetworking.Thisdatarateincreaseisachievedbyusingadvancedsignal
processing techniques, more complex modulations, and wider signal bandwidths.
Therefore,high-performancereceivers,abletocapturewide-bandwidthsignals,are
requiredforhigh-endconsumercommunicationandinfrastructureequipments.For
instance, this includes Cable and Satellite home gateways, cellular infrastructure
transceivers,andwhite-spacespectrumsensing.
As signal bandwidth continuously increases in these applications, the usage of
narrowbandreceiversmightnotbecomepowerefficient.Inaddition,costpressure
requestslow-costmultichannelreceiverstobemorecost-effectivethanamultitude
of narrowband receivers. Figure 1 shows a typical satellite receiver: an outdoor
unit translatesthe satellitebandfrom the 10GHz range to950 MHz–2,150 MHz.
Asseveral36MHz-widechannelsarerequiredtobereceivedinordertoallowthe
user to perform simultaneously HD video watching or recording, a wideband
receiver capturing the full 950 MHz–2,150 MHz band could replace several
36MHz-BWRFreceivers.
Indefense,radio-astronomy,spacetelecomapplicationswhichrequiremultiple
receivers, advances in CMOS processes could open the door to complex signal
processing implementation. The use of these techniques is typically not viable in
widebandapplications,sincetheuseofparallelstate-of-the-artwidebandreceivers
would not be power and size/weight competitive. For instance, in S-band/L-band
digital communication and radars applications, the versatility and performance
advantagesthatdigitalbeamforming(Fig.2,right)couldbring,comparedtoanalog
beamforming(Fig.2,left),arenotpossibleduetothelackoflow-powerlow-size
widebandreceivers.
vii
viii Preface
Outdoor Unit
M
RF receivers
... U ... Indoor CPE
X
RF= DVB-S / S2
symbol demod
11.7GHz-
12.75GHz DVB-S / S2
symbol demod
Video ...
IF= processing
(MPEG)
950MHz- DVB-S / S2
2150MHz symbol demod
DVB-S / S2
symbol demod
Fig.1 Satellitebroadbandmultichannelreception
A A A A A A A A
D D D D D D D D
A
Digital Summation
D
Fig.2 Left:Analogbeamforming.Right:Digitalbeamforming
Identified Research Objectives
Theresearchofhighlyintegratedreceivers,intheDC-3GHzrange,andcapturing
signal bandwidths of few hundreds of MHz are targeted in this work. Direct RF
digitization receivers are attractive for these wideband applications, but several
stepshavetobetakenintoaccountinordertoprovideperformingsolutions.
Theidentifiedresearchactivitiesthatarerequiredtotacklethesechallengesare
asfollows:
(cid:129) Architect direct RF digitization receivers at system level from RF to DSP,
considering broadband aspects, and trades-off between cost, power consump-
tion,RFperformance,andsize.
(cid:129) Designhigh-performancelow-powerADCsinaCMOStechnology.
(cid:129) Designlow-powerhigh-speedDigitalChannelSelection.
(cid:129) DesignadequateRFsignalconditioningthatrelaxestheADCrequirements.
(cid:129) ProvethefullsystemperformancefromRFtobasebandprocessing.
Preface ix
Author Contributions and Book Organization
Thisworkpresentsthesystem-leveldesignofdirectRFdigitizationreceivers,from
theorytorealizationandmeasurementsforacablemultichannelreceiver.
Themaincontributionsofthisbookareasfollows:
(cid:129) System-levelanalysisanddesignofdirectRFdigitizationreceivers
(cid:129) Theoretical analysis of broadband nonlinear distortion for low-pass and band-
passsamplingschemes
(cid:129) Theoretical analysis of sampling and quantization (clock purity, time-
interleavederrors,signal-dependentnoise)inabroadbandreceptioncontext
(cid:129) Designofanapplication-optimizedsignalconditioner,including:
– A single-inductance multi-slope programmable RF amplitude equalizer,
togetherwithitscontrolalgorithm
– Amixed-signalAGCloopcombiningRMSandpeakdetection
(cid:129) DesignofanintegrateddirectRFdigitizationproduct,exceedingstate-of-the-art
powerconsumption,cost(siliconarea),andequivalentorbetterRFperformance
thanlegacysilicontuners
Thisbookisorganizedasfollows:
In Chap. 1, signal processing techniques are reviewed, from RF mixing through
sampling to analog-to-digital conversion. The state of the art of radio receivers is
provided,motivatingthefocusondirectRFdigitizationarchitecture.
Thesystem-leveldesignframeworkfordirectRFdigitizationreceiversisprovided
in Chap. 2, linking the communication system specifications to the receiver
impairments, with a special focus on the broadband aspects of sampling and
digitization, including broadband nonlinear distortion, ADC time-interleaving
nonidealities,andclockpurity.
InChap.3,thetheorydevelopedinChap.2isappliedtothesystem-leveldesignof
a direct RF digitization receiver product for multichannel cable. An optimum RF
signalconditioningisinvestigated.
Chapter 4 presents the block-level design of the RF signal conditioner and the
mixed-signal front end and also presents the system-level measurement results of
thereceiverinabroadbandenvironment.
Finally,ageneralconclusionrecapitulatesthepresentedworkandintroducesfuture
workorientationsandperspectives.