power integrity: challenges, best practices and test ...€¦ · ıfast update rates let users test...
TRANSCRIPT
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Power Integrity:
Challenges, best practices and test solutions for
sensitive electronic designs
Presenters:
Steve Sandler, CEO of Picotest
Andreas Ibl, Product Manager Oscilloscopes at Rohde & Schwarz
Andrea D’Aquino, Product Manager Network Analysis at Rohde & Schwarz
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This Photo by Unknown Author is licensed under CC BY-NC
SI PI
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PI SICopyright © 2018 Picotest.com. All Rights Reserved.
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Power Supply Induced Jitter
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1kHz RBW
Unexpected Noise – 2.8MHz POL
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Jitter Induced Jitter
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PI SI
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Noise Induced by a Single Logic Gate
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Dynamic Response
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Rogue Waves
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Impedance is the Common Denominator
Stability issue
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What is Power Integrity?
Power integrity (PI) is simply the assurance that power applied to a circuit or device is appropriate
for the desired performance of the circuit or device
This is not just about keeping voltages within limits!!!
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The PDN Highway
VRM
Loads
Planes
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A Simple Power Distribution Network (PDN)
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PSRR - (S21)The Ideal PDN is Flat
Power Supply
Rejection Ratio
Input Filter and
BusPlanes and LoadsVRM
Reverse Transfer
PSRR
Zin Zout
Stability concerns exist at
both the input and the
output
Resonances Degrade Performance
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It Tells Us About Stability
NISM - In-System Test for Phase Margin
ı It’s called ‘NISM’
Non-Invasive Stability Measurement
ı And it’s available for R&S ZNL!!
ı Performed using a simple cursor operation
ı As accurate as a Bode plot and often accurate
when a Bode plot isn’t
ı Phase margin derived from Output Impedance
Accurate up to 65 degrees
ı Proven Accuracy
From 2-Port Impedance to
Stability Margin
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Opamp Measurement
Works over all frequencies
NISM Phase Margin
21.47 Degrees
Stability from Output Impedance –
No Frequency Limits
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What Power Rail Impedance Plots Tell Us
Motherboard measurement power
on (red) and off (blue)
Flat=resistor
Rising=inductor
Falling=capacitor
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1. Determine L from resonance or 3dB point
2. Determine R from below resonant frequency
3. Set
4. Set Cap ESR = R
𝑪 =𝑳
𝑹𝟐
Minimize L and MAXIMIZE R Undersized output capacitor reveals the
inductance resulting from the internal
pole and slope compensation
How to Fix Poor Impedance
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Reduced L (reduce filter inductor/raised Fsw)
Removed Ceramic output capacitors
Installed Tantalum capacitors
Before and After
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Impedance
2-Port – Ground Loop
ı Due to the existence of a DC ground loop
through the connecting cable braids, a 50Ω
coaxial transformer is required for shunt-
through measurements
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Low ESR caps must
be mounted in a
calibrated PCB for
measurement
The 2−port shunt−through method can easily
measure capacitors with ESR below 1mΩ
Measure Potential Output Capacitors
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Five techniques for fast, accurate power integrity
measurements
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Power Rail Measurement Challenges
Lower rail voltages and smaller tolerances
10%
1%
To
lera
nce
5%
Rail
Value
Tolerance Need to
measure
3.3 V 1% 33 mVpp
1.8 V 2 % 36 mVpp
1.2 V 2 % 24 mVpp
1 V 1 % 10 mVpp1 V5 V 3.3 V 1.8 V
170 mVpp
Easy to measure
12 V
Hard to Measure
500 mVpp
10 mVpp33 mVpp
Examples
DC Rail
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1. Adjust viewing characteristics
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1. Adjust viewing characteristics
Waveform intensity
Default – 50% Adjusted to 90%
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1. Adjust viewing characteristics
Infinite Persistance
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1. Adjust viewing characteristics
Color Grading More easily identify pixels that are hit less frequently.
See how often anomalies occur
ı Benefits:
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2. Lower Noise
Several Factors Make It Difficult to Measure Small Signals
Noise
Signal (DUT)
Scope
display
Consequences
Large measurement
deviation
Measured Vpp >>
Actual Vpp
Can mask/hide
anomalies
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2. Lower Noise
Choose signal path that has the lowest noise
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2. Lower Noise
Use the most sensitive vertical scale
Noise Vpp = 1.2 mVNoise Vpp = 4.1 mV
20 mV/div 2 mV/div
All other settings are identical
Use the smallest V/div setting to get the most accurate measurement (lowest noise)
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2. Lower Noise
Limit bandwidth
Noise in time domain
Distribution of noise in frequency domain
4 GHz bandwidth
200 MHz bandwidth
20 MHz bandwidth
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2. Lower Noise
Choose the right probe
Vpp = 61 mV 50% overstated Vpp = 41 mV
10:1 1:1
10:1 attenuation 1:1 attenuation
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2. Lower Noise
RT-ZPR20 & ZPR40 Power Rail Probe
ı Designed uniquely for
measuring small
perturbations on power
rails
ı Active, single-ended probe
ı Low noise with 1:1
attenuation
ı Best in class offset
compensation capability
ı Built-in DC meter
Key Specifications
Attenuation 1:1
ZPR20 BW
ZPR40 BW
2 GHz(*)
4 GHz(**)
Browser BW 350 MHz
Dynamic Range ±850 mV
Offset Range > ±60 V
ZPR20 NoiseScope (RTO) standalone
Scope + Probe Noise(at 1 GHz, 1mV/div)
107 µV ACrms
120 µV ACrms
Input Resistance 50 kΩ @ DC
R&S ProbeMeter Integrated
Coupling DC or AC(*) 2.4 GHz typical 3 dB point(**) 4.0 GHz typical 3dB point
ZPR40
ZPR20
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3. Achieve sufficient offset
DC Drift
DC blocks
Eliminate low freq visibility
With ZPR20
see low freq DC changes
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3. Achieve sufficient offset
Probes with built-in offset
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4. Evaluate switching and EMI
Frequency domain view
Vpp with statistics
High BW shows
coupled sources
2.4 GHz coupling
1.9 GHz coupling
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5. Accelerate measurement time
Update rate impact on speed of power integrity measurements
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Conclusion
ı Choosing a scope with low noise is critical to accurate power integrity measurements
ı Coupling the scope with a 1:1 probe with built-in offset, high bandwidth, high DC impedance
and an integrated R&S®ProbeMeter delivers superior capability and measurements
ı Understanding and correctly setting a number of oscilloscope attributes such as vertical scaling
and bandwidth limit filters increases the accuracy of results
ı Adding frequency domain view enables users to quickly isolate coupled signals
ı Fast update rates let users test power rails more quickly
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Support for power integrity
1000
RTC100050 MHz .. 300 MHz
2000
RTB200070 MHz … 300 MHz
3000
Performance
Bandw
idth
LAB
RTO2000
600 MHz … 6 GHz
HANDHELD
RTH100060 MHz … 500 MHz
BENCH
RTE1000200 MHz … 2 GHz
RTM3000100 MHz … 1GHz
RTA4000200 MHz … 1 GHz
4000
R&S Scope Portfolio Oscilloscope Innovation. Measurement Confidence.
High Performance
RTP
4 GHz … 8 GHz
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Accurate PDN Impedance Measurements
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Measure PDN Impedance with R&S®ZNL
ı Reflection setup
ı Shunt-transmission setup
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Γ =
𝑍𝐿𝑍1
− 1
𝑍𝐿𝑍1
+ 1
1
1
Reflection setup
Γ = ቤ𝑏1𝑎1 𝑏2=0
= 𝑆11Measurement
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Reflection setup
𝑍𝐿 = 𝑍1 ∙1 + 𝑆111 − 𝑆11
𝑍1= 𝑍𝑃𝑂𝑅𝑇 + 𝑍𝑃𝑅𝑂𝐵𝐸
or
50 Ω
if calibrated @ measurement plane
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Shunt-Transmission setup
𝑍𝐿 =50
2∙
𝑆211 − 𝑆21
𝑍0 ≝ 𝑍1 = 𝑍2 = 50Ω
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Shunt-Transmission setup
𝑍𝐿 = 25 ∙𝑆21
1 − 𝑆21
Best impedance dynamic range ( ~ kΩ )
𝒁𝑷𝑫𝑵 𝒕𝒂𝒓𝒈𝒆𝒕 ≃𝑉𝐿 𝑛𝑜𝑖𝑠𝑒
𝐼𝐿 𝑤𝑜𝑟𝑠𝑡−𝑐𝑎𝑠𝑒
Low (nom. V supply * ripple %)
High (worst transient)
mΩ
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Shunt-Transmission setup
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R&S®ZNL – Comprehensive PDN testing… Easy
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Power Integrity:
Challenges, best practices and test solutions for
sensitive electronic designs
Please contact the presenters by email if you have any questions or comments
Steve Sandler: [email protected]
Andreas Ibl: [email protected]
Andrea D‘Aquino: [email protected]
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Thank You
www.picotest.com
www.rohde-schwarz.com