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High Fidelity Measurement
1 sim_phase 2 sim_gain 3 bench_gain 4 bench_phase
10 100 1k 10k 100k 1Megfrequency in hertz
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Bode Output Impedance Filter Stability Step Load Extracted Phase Margin
PSRR Crosstalk Reverse Transfer Components with DC Bias
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Why we NEED to make the measurements
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1001000
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13 Degrees41 Degrees74 Deg67Deg
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13 Degrees67 Degrees41 Degrees71 Degrees
Frequency (Hz)Re
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B)
Many performance characteristics are severely degraded by poor phase margin
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Complete Characteristics of Voltage RegulatorVoltage
Regulation
Dropout
Tempco
Step Load
Output Z
Crosstalk
Stability
PSRR
Input Z
ReverseTransfer
Filter Stability
Ripple &Noise
DUT
Time Domain vs. Frequency Domain
• Ripple and Noise / Jitter
• Step Load Response
• Turn-On, Softstart
• Fault Recovery
• Sequencing
• Glitch search
• Poor Sensitivity 10mV-20mV
• Gain/Phase Stability
• PSRR
• Crosstalk
• Reverse transfer
• Filter Attenuation (i.e. EMI)
• Components (impedance and Q)
• 1uV-2uV sensitivity
• Output Impedance
Time Domain Freq Domain
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Picotest J2100 Series Injectors
• J2100A 1Hz-5MHz Injection Transformer
• J2101A 10Hz-45MHz Injection Transformer
• J2110A DC-50MHz Voltage Injector
• J2111A DC-40MHz Current Injector
• J2120A Line Injector
• J2130A DC Bias Injector
• J2140A Cascadable Attenuators
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OMICRON-Labs Bode 100
– All in one:• Vector Network Analyzer• Impedance Analyzer• Gain Phase Meter• Sine wave Generator
– Frequency range:• 1 Hz – 40 MHz
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J2100A J2101A
• 23 Octave Ultra wideband Transformers• Specially annealed amorphous crystal core for outstanding low frequency
performance
J2100A and J2101A Transformers Traditional Bode Plots - Stability
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Non-mixing input for Audio testing!
• DC-40MHz• Opamp Testing• Audio Testing• Very low distortion
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J21110A Solid Stage Voltage Injector Traditional Phase Margin
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J2110A Solid State Voltage Injector
J2110A vs. J2100A vs. BWIT
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• Lower Noise• Wider Bandwidth• Bode Plots
Omicron Lab Bwit
Picotest J2110A
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Picotest J2100A
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J2111A Phase Margin ExtractionNon-Invasive Approach
Phase Margin without access to the control loopMiddlebrook Filter Stability
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• High Fidelity Bilateral Injector
J2111A Impedance/Step LoadSolid Stage Current Injector
20nSec Edge SpeedCopyright © 2010 Picotest.comAll Rights Reserved Confidential and Proprietary
J2111A Step Load Comparison
Step Load Transients
Low Resolution
High Resolution
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J2120A Line/PSRR Injector
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Ultra High PSRR Regulator Measurement and Noise Floor
J2140A Cascadable AttenuatorsThe #1 issue with Network Analyzer measurements is that the
oscillator signal is too large!
3.3V 50mA Voltage Regulator Bode
-37dBm and -20dBm injection
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-37dBm and -30dBm injection
See recent article atwww.picotest.com
“Why Network Analyzer Signal Levels Affect Measurement Results”
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J2140A Cascadable AttenuatorIs often required for Bode plot
BODE 100 Shaped Level tames noiseKEEP SIGNALS SMALL!!
• Parameter extraction for Semiconductors• DC Blocking• Measure X5R capacitor vs. DC Bias• Measure Varactors
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J2130A DC Bias Injector
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Application Notes
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https://www.picotest.com/blog Application Notes for
•Optocouplers•References•Regulators•Battery Impedance•Diodes•Non-invasive stability•Reverse Transfer•Output Impedance•PSRR•Crosstalk•ESL•Measuring Regulator Noise•Mosfet
…And MORE
VRTS Test Standard
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• Step-by-Step• Measurement-by-
Measurement• Hands on learning• Establishes a Test
standard for voltage regulator testing