labrador preliminary internal design review
TRANSCRIPT
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LABRADORpreliminary Internal Design Review
Gary S. VarnerOn the whipping post
ID Lab10 Oct 2003
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1Gary S. Varner, LABRADOR Internal Design Review, October 2003
Topics (1 hour(?) + 1 hour)
• ANITA ‘ARF’ Architecture– Relation to triggering (STRAW3)– How parts go together
• LABRADOR– Large Analog Bandwidth Recorder And Digitizer with
Ordered Readout– Design philosophy– Improved ADC, readout speed
• Review Items (critical)– It’s the BandWidth Stupid
• What learned from STRAW2• Engineering Tradeoffs
– SPICE simulations (RLC)– 3-D EM sims (Zeland)
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2Gary S. Varner, LABRADOR Internal Design Review, October 2003
Askaryan Signature
0 2 4 6 8
Time (ns)
• Significant signal power at large frequencies
• Strong linear polarization (near 100%)
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3Gary S. Varner, LABRADOR Internal Design Review, October 2003
Proposed Signal Flow
STRAW3
LNA Gain
Digitize
Trigger
[GHz]1.2.3
LABRADOR[GHz].3 1.2
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4Gary S. Varner, LABRADOR Internal Design Review, October 2003
Straw Man
Trigger/Digitizers
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5Gary S. Varner, LABRADOR Internal Design Review, October 2003
August ’03 Baseline ANITA RF (ARF) Board
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6Gary S. Varner, LABRADOR Internal Design Review, October 2003
LABRADOR Goals
• Maximum input bandwidth– 50Ω impedance– Simplified architecture (no trigger functionality)– “best” RF coupling into Switched Capacitor storage cells– Classical engineering trade-offs
• Input trace resistance vs. load capacitance• Storage capacitor kTC noise vs. load capacitance• Storage switch Ron vs. drain load capacitance
• Analog Transfer– Optimum speed– Individual channel parallel
• Improved ADC– Ramp type – no missing codes– Massively parallel to reduce conversion time
Address first
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7Gary S. Varner, LABRADOR Internal Design Review, October 2003
RF Transient Recorder Specs
• >= 1GHz analog input bandwidth (200-1200MHz)
• multi-GSa/s sampling rate (Nyquist limit min.)
• minimum phase distortion for clean polarization
• dynamic range (>= 10 bits)
• internal Analog to Digital Conversion (ADC)
• short record length (100-200ns if optimally matched)
• self-triggering with fine threshold adjustment
• bi-polar triggering
• deadtimeless conclude multi-hit buffering needed
• LOW POWER!! (need 36(40) * 2 channels)
[Acqiris > 1kW] Target: 20W/channel 20mW/channel
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8Gary S. Varner, LABRADOR Internal Design Review, October 2003
Switched Capacitor Array (SCA)
input• Write pointer is ~4-6 gates open @ once
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9Gary S. Varner, LABRADOR Internal Design Review, October 2003
STRAW2/3 Architecture
• 0.25µm TSMC process
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10Gary S. Varner, LABRADOR Internal Design Review, October 2003
LABRADOR Architecture
• 0.25µm TSMC process
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11Gary S. Varner, LABRADOR Internal Design Review, October 2003
STRAW2 Evaluation
• RF signal input
• Adjustable: 0.6 –3.4 GSa/s
• 256 samples (70 –300ns)
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12Gary S. Varner, LABRADOR Internal Design Review, October 2003
Better than expected
STRAW2 Sampling Freq.
0
0.5
1
1.5
2
2.5
3
3.5
1 1.5 2 2.5 3
Freq. Adj. Voltage (ROVDD) [V]
Sam
plin
g Fr
eq. [
GH
z]
Avg.-cycle+cycleSPICE
LABRADOR will extend to lower freq.
Separate VDD,VSS Adjust to reduce
asymmetry
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13Gary S. Varner, LABRADOR Internal Design Review, October 2003
STRAW ADC Expectations
“worst case” for mismatch in a previous implementation of same
SAR ADC w/R-2R ladder
Can correct to rather linear, but still differential sensitivity and calibration is a pain
Wilkinson type better – monotonicBUT, slower
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14Gary S. Varner, LABRADOR Internal Design Review, October 2003
“Wilkinson” ADC
+-
• No missing codes
• Linearity as good as can make ramp
• Can bracket range of interest
NB: SCA output not
linear
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15Gary S. Varner, LABRADOR Internal Design Review, October 2003
ADC Sim
Wilkinson ADC SPICE Sim
y = 128.25x + 1.324R2 = 0.9999
0
50
100
150
200
250
300
350
0 0.5 1 1.5 2 2.5 3
Input Voltage [V]
Out
put c
ode
[cou
nts]
Wilk ADCLinear (Wilk ADC)
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16Gary S. Varner, LABRADOR Internal Design Review, October 2003
Transfer Curve
Storage Cell Simulation
y = 6.2891x - 2364.8R2 = 0.993
0
100
200
300
400
500
600
700
350 400 450 500
Stored Waveform (Vin) [mV]
Diff
sen
sed
Volta
ge (V
out)
[mV]
Rload = 40k
Gain:
mVCkTvstore
rms 23.0==
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17Gary S. Varner, LABRADOR Internal Design Review, October 2003
Readout speed comparison
12.8 µs20MHz©EXTLABRADOR -- parallel
210 µs10MHzEXTLABRADOR -- serial
240 µs100kHz(b)INTLABRADOR -- ARF
410 µs10MHz(a)EXTSTRAW3 -- FINESSE
1,638 µs2.5MHzINTSTRAW3 -- ARF
3,072 µs1MHzEXTSTRAW2 – DALI
384 µs8MHzEXTSTRAW2 - GEISER
Total LatencyspeedADCIC Evt.Size
6kB
8kB
4kB
(a) 16 channels for STRAW3, 12 channels for STRAW2(>300MB/s!!)(b) 12.8MHz effective: 128x ADC; 100MHz clock, 12b eff. – includes additional latency
© 8x 20MHz ADC in parallel
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18Gary S. Varner, LABRADOR Internal Design Review, October 2003
RF Response (1)
• Sub-ns transient ping: <= 100ps leading edge
Scope ET sampling:100 Gsa/s equiv.
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19Gary S. Varner, LABRADOR Internal Design Review, October 2003
RF Response (2)
• Very nice tool: FFT analysis of RF transient pulse
• Have ideas how to improve –roll-off matches SPICE simulations of storage cells
1/8 ampl
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20Gary S. Varner, LABRADOR Internal Design Review, October 2003
Understanding STRAW2 Performance
• Contributions considered:– Simple Estimates based on R(Z)LC
– Coupling into package leadframe (TQFP-100)
– On-chip “stripline”
• What is the real limitation?– Cannot rule out multiple contributions (2x poles?)
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21Gary S. Varner, LABRADOR Internal Design Review, October 2003
STRAW2 Model
7mm3.2mm
MOSIS ID
ii
• Microstripinput
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22Gary S. Varner, LABRADOR Internal Design Review, October 2003
STRAW2 Equiv. Ckt.
STRAW2 Resistance Estimate Input (RF) Input (ref)bond wire
0.0 0.1 pad70 0.2 M5-M4
Metal 4(sheet) = 0.07 Ohm/sq 243.5 17.0 typ length (sq.)Metal 5(sheet) = 0.03 Ohm/sq 1704 51.1 typ length (sq.)
Poly contact = 5.1 Ohm 6 6 0.9 0.9via 1= 2.7 Ohm 6 3 0.5 0.9via 2= 5.35 Ohm 6 3 0.9 1.8via 3= 8.26 Ohm 6 3 1.4 2.8via 4= 11.34 Ohm 6 1.9
56.6 23.6 Total per feed
48.3 Rterminator
Measured: 130 Ohm 128.5 Grand Total
17Ω
29Ω
48Ω
~50Ω
78fF
~1kΩ
~6fF0.11Ω
22-45Ω
50-130Ω
M5 14λ
Lbond=2.6nH(Z=130,L=6mm)
STRAW2 Z~50ΩM498λ
M5 60λ
Z~30ΩSTRAW3 M498λ
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23Gary S. Varner, LABRADOR Internal Design Review, October 2003
Naïve Calculations –EST.
Component Length/area Unit Factor Funit Total [fF]Input traces 5 cm 0.2 pF/cm 1000 w.a.g.bonding wire 150 mil 0.3 pF/wire 300 w.a.g.
input pad 60 um^2 187 fF/pad 187 Tannerinput protection 594 λ 1.1 pF/ckt 1100 SPICEstripline area 2500 um^2 43 aF/um^2 107.5 MOSISstripline fringe 5 mm 60 aF/um 300 MOSISSwitch Drains 256 switches 5.6 fF/drain 1433.6 SPICE
Open Switches 6 open 87 fF/gate 522 SPICE
TOTAL 4.9501 pF
.1.22
13 GHz
RCf dB ==
πBonding wire, series R limit
R=Rfeed C=Cload C~2.5pFR~30Ω
.27.12
13 GHz
ZCf dB ==
πLumped elementZ=Z0 C~2.5pF~50Ω
C probably pessimistic, but 2nd pole?800MHz~80Ω C~2.5pF
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24Gary S. Varner, LABRADOR Internal Design Review, October 2003
Bounding Case
Guidance for Cap Max
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0 1 2 3 4 5
Total Load Capacitance [pF]
BW
[GH
z]
pure C + ZoSTRAW2
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25Gary S. Varner, LABRADOR Internal Design Review, October 2003
Storage Capacitor constraints
Impact of Storage Cap size
0
0.5
1
1.5
2
2.5
0 50 100 150 200
Storage Cap [fF]
Vrm
s [
mV
]
Vrms
STRAW2
For 1V useable input range
9bits
10bits
11bits
12bits
mVCkTvstore
rms 23.0==
Cstore only 78fF !!
Too big??
DC SPICE sim shows can make Rstatic ~ 920Ω, but there is a dynamic component also.
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26Gary S. Varner, LABRADOR Internal Design Review, October 2003
RF Coupling Simulation
.4.62
13 GHz
RCf dB ==
π.4.6
21
3 GHzRC
f dB ==π
.4.62
13 GHz
RCf dB ==
π.4.6
21
3 GHzRC
f dB ==π
die
on-chip 50Ω stripline
Bonding wires
• Utilizes the LC program (FTDT algorithm)– Cray developed, available for free under Linux
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27Gary S. Varner, LABRADOR Internal Design Review, October 2003
S-Parameters
STRAW2 Packaging S-Parameters
0
0.2
0.4
0.6
0.8
1
1.2
0 0.5 1 1.5 2 2.5 3
Frequency [GHz]
S11S21
VSWR:
1.8 [1GHz]
1.9 [2GHz]
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28Gary S. Varner, LABRADOR Internal Design Review, October 2003
SPICE stripline vs. lumped
Transmission line – lossy (multiple elements)
Two techniques give plausibly consistent results, however there is good reason to be skeptical (GIGO)
One point: @ 1GHz, length of on-chip stripline is approx.4-6o (STRAW2/3)
[~3o LABRADOR]
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29Gary S. Varner, LABRADOR Internal Design Review, October 2003
RF Response
Tried afterLast designReview –
BW obtainedToo High!!
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30Gary S. Varner, LABRADOR Internal Design Review, October 2003
A worry…
Switch Transition Timing
-0.5
0
0.5
1
1.5
2
2.5
3
0 0.5 1 1.5 2 2.5
Time [ns]
Gat
e vo
ltage
[V]
SMP0SMP0b
1.27GHz
1.6kΩ
3.4kΩ
604MHz11.7kΩ
170MHz
11.7kΩ
1.4MHz
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31Gary S. Varner, LABRADOR Internal Design Review, October 2003
SPICE Wave capture Sims
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32Gary S. Varner, LABRADOR Internal Design Review, October 2003
Raw Waveform
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33Gary S. Varner, LABRADOR Internal Design Review, October 2003
Simulation
Sample compares
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 1 2 3 4
Time[ns]
Am
plitu
de
unloaded0.25pF loadRef x637fF CstoreBig gateSuperD buffBig CstoreTiny CapGND source
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34Gary S. Varner, LABRADOR Internal Design Review, October 2003
FFT curves
Vref1
Vref2
STRAW2
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35Gary S. Varner, LABRADOR Internal Design Review, October 2003
Cross-check
Vref Comparison
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.5 1 1.5 2 2.5 3
Time [ns]
DC
sub
t. Vr
ef
Vref1Vref2Vorig
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36Gary S. Varner, LABRADOR Internal Design Review, October 2003
Cross-check (2)
Vref Comparison
-0.05
0
0.05
0.1
0.15
0.2
0.5 1 1.5 2 2.5 3
Time [ns]
DC
sub
t. Vr
ef
Vref1Vref2
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37Gary S. Varner, LABRADOR Internal Design Review, October 2003
Cross-check (3)
Vref Comparison
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.5 1 1.5 2 2.5 3
Time [ns]
DC
sub
t. Vr
ef
Vref1Vref2VorigVref3Vref4Vref5
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38Gary S. Varner, LABRADOR Internal Design Review, October 2003
Treat as Systematic Error?
BW Comparison STRAW2
-14
-12
-10
-8
-6
-4
-2
0
0 0.2 0.4 0.6 0.8 1 1.2
Freq [GHz]
Atte
nuat
ion
[dB
]
Vref sample1Vref sample2
ContinueStudying
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39Gary S. Varner, LABRADOR Internal Design Review, October 2003
Convergence** Accuracy and convergence options:* absi|abstol : 5e-010 absv|vntol : 1e-006 accurate : 0* cshunt : 0 dchomotopy : All dcmethod : Standard* dcstep : 0 extraiter|newtol : 0 fast : 0* gmin : 1e-012 gmindc : 1e-012 gramp : 6* gshunt : 0 kcltest : 1 kvltest : 0* maxdcfailures : 4 mindcratio : 0.0001 minsrcstep : 1e-008* numnd|itl1 : 200 numndset|dchold : 20 numns|itl6 : 50* numnx|itl2 : 80 numnxramp : 40 precise : 0* reli|reltol : 0.0005 relv : 0.0005 tolmult : 1** Timestep and integration options:* absdv : 0.5 absq|chargetol : 1e-014 ft : 0.4* lvltim : 2 maxord : 2 method : gear* mintimeratio : 1e-009 mu : 0.5 numnt|itl4 : 10* numntreduce|itl3 : 3 poweruplen : 0 reldv : 0.35* relq|relchgtol : 0.0005 rmax : 2 trtol : 10** Model evaluation options:* dcap : 2 defad : 0 defas : 0* defl : 0.0001 defw : 0.0001 defnrd : 0* defnrs : 0 defpd : 0 defps : 0* deriv : 0 minresistance|resmin : 1e-005 modelmode : cachetable* moscap : 0 mosparasitics : 0 scale : 1* scalm : 1 tnom : 25 wl : 0** Linear solver options:* linearsolver : best pivtol : 1e-014 zpivtol : 1e-006*
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40Gary S. Varner, LABRADOR Internal Design Review, October 2003
LABRADOR case
128x Wilk ADCs8 chan. * 256 samples
8x HS Analog out, 1x MUX out
STRAW3
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41Gary S. Varner, LABRADOR Internal Design Review, October 2003
LABRADOR Equiv. Ckt.
5Ω
4.7Ω
28Ω
~13Ω
10fF
~0.7kΩ
~12fF0.02Ω
0.3Ω
50-130Ω
M5 14λ
Fixed
LABRADOR Resistance Estimate Input (RF) Input (ref)bond wire
Length 17000 λ 0.0 0.1 pad70 0.2 M5-M4
Metal 4(sheet) = 0.07 Ohm/sq 71.42857 5.0 typ length (sq.)Metal 5(sheet) = 0.03 Ohm/sq 166.6667 5.0 typ length (sq.)
Poly contact = 5.1 Ohm 6 6 0.9 0.9via 1= 2.7 Ohm 6 3 0.5 0.9via 2= 5.35 Ohm 6 3 0.9 1.8via 3= 8.26 Ohm 6 3 1.4 2.8via 4= 11.34 Ohm 6 1.9
10.5 11.5 Total per feed
28 Rterminator
Measured: Ohm 50.0 Grand Total
STRAW2 Z~50ΩM498λ
LABRADOR M5 102λ
M4 Z~13Ω238λ
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42Gary S. Varner, LABRADOR Internal Design Review, October 2003
Comparison
BW Comparison LABRADOR
-14
-12
-10
-8
-6
-4
-2
0
0 0.2 0.4 0.6 0.8 1 1.2
Freq [GHz]
Atte
nuat
ion
[dB
]
STRAW2 (pessimistic)LABRADOR (mod)
2.33fF
2x W:L
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43Gary S. Varner, LABRADOR Internal Design Review, October 2003
LABRADOR – Best Quess onto chip
Component Length/area Unit Factor Funit Total [fF]Input traces 5 cm 0.2 pF/cm 1000 w.a.g.bonding wire 150 mil 0.3 pF/wire 300 w.a.g.
input pad 60 um^2 187 fF/pad 187 Tannerinput protection 594 λ 1.1 pF/ckt 1100 SPICEstripline area 2500 um^2 43 aF/um^2 107.5 MOSISstripline fringe 5 mm 60 aF/um 300 MOSISSwitch Drains 256 switches 5.6 fF/drain 1433.6 SPICE
Open Switches 6 open 87 fF/gate 522 SPICE
TOTAL 4.9501 pF2.3fF
8fF
.35.12
13 GHz
ZCf dB ==
πHard to get much
higherZ=Z0 ~50Ω C~2.35pF
0.3pF?
2.05pF
.876.02
13 GHz
ZCf dB ==
πPessimistic case: full stripline Cap = .74pF
If use bigger transistors, Ctotal ~ 2.8pF
[Min tran & full Cap = 1.46GHz]
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44Gary S. Varner, LABRADOR Internal Design Review, October 2003
Zeland Software
Serious Learning CurveBasically as complex as
AutoCAD
Best use of time?
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45Gary S. Varner, LABRADOR Internal Design Review, October 2003
Summary/Homework
• Package simulation– Geometry Input to Zeland quite elaborate– Will take some time– Not much can do about (BGA not really an option)
• Plans:– LABRADOR submission deadline (11/17)
• Only mopping up after everyone disappears for Antarctica
– Bite bullet and increase SPICE sim window enough to do AVTECH pulse simulation
– Optimization: specific tuning:• Storage cap size• Storage gate size
– Multi-dim optimization? (using 4x software tools…)
• Action Items from this meeting (another mtg?)• Hope at least can sign-off on general issues
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46Gary S. Varner, LABRADOR Internal Design Review, October 2003
Back-up slides
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47Gary S. Varner, LABRADOR Internal Design Review, October 2003
Summary:Design Issues for ANITA
• RF amps/filter mounting– Directly onto back of antennas? (modular)
• Better performance, but power, cooling, cabling issues
– Miteq LNAs adequate?– Sufficient sensitivity (w/ power limit, multi-notch filters) ??
• Trigger architecture:– Global, local, cluster (half-array) ??– Logic on ARF boards ??– Multi-leveled ?? Multi-band ??– VETO ?? RCP & LCP generation ??
• Signal digitizing:– Random interleaving (longer record length) ??– Alternatives to current plan ??– Multi-buffering (ping-pong) depth ??
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48Gary S. Varner, LABRADOR Internal Design Review, October 2003
High-speed Digitizers
• Kleinfelder speed but not high
analog BW
High Speed Digitizer Comparison
10
100
1000
10000
10 100 1000 10000
Analog Bandwidth [MHz]
Sam
plin
g R
ate
[MS
a/s]
ZEUS[12]RD2[13]Kleinfelder[14]Haller[15]ADeLine1[11]DSC/DRS[16]AD9410[17]CLC5957[18]TLV5580[19]ADS5102[20]MAX1449[21]
Desired Max.Operating Region
STRAW2• Analog BW tough
• Comm. ADC very high P