AEi Systems
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Los Angeles, CA 90045
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aeisystems.com
Solving 8 of 10 Design Issues
8 of 10 Design issues I find are due to this single problem
Five things every Engineer should know about
PDN
The increasing use of FPGAs in our products means that at some point we will all
need to be fluent in Power Distribution Networks.
How to pick the best voltage regulator for
a circuit
What performance criteria do I use? Dropout, Max Current, Accuracy, PSRR are all
discussed.
Why do a Worst Case Analysis?
This paper outlines the rationale and cost saving upsides
Why do we care about Stability? Steve Sandler discusses the impact of power supply
and opamp stability on noise, jitter, PSRR, crosstalk, and reverse transfer performance.
Common problems are discussed. Watch this video to learn how poor loop stability
can lead to noise problems and degraded performance.
Part 2: Impedance
is the Critical Measurement
Whether your goal is to optimize system performance or to troubleshoot issues in
distributed power systems, impedance measurement is an indispensable test.
Part 3: Measuring
Impedance Using Vector Network Analyzers
This video focuses on single-port measurements, describing how they can be applied
to measure the impedance of low power circuits and components. This is a critical
test for those looking to make accurate SPICE models.
Part 4: Measuring
Impedance Using Vector Network Analyzers (Two-Port Tests)
This video explains making and interpreting two-port impedance measurements, particularly
those of batteries, DC-DC converters, and EMI filters. Setup requirements such as
4-wire connections, a common-mode transformer, DC blockers, and AC versus DC coupling
are explained in this video. Also discussed is the use of a preamp to measure PDN
impedances below 1 milliohm.
Part 5: Using
Current Injectors
This video discusses how to measure the stability and impedance of all types of
regulators; even those without exposed control loops. Although not quite as accurate
as the two-port VNA impedance measurement, the current injection technique has advantages
including wide range (approx. 1 milliohm to thousands of ohms), the ability to measure
in-system, and a suitability for measuring low-power devices such as op amps, voltage
references, and voltage regulators.
Part 6: The
Switch
The measurement and interpretation of switch node waveforms as observed in point-of-load
regulators is discussed. Instrumentation requirements for measuring POLs and the
impact of scope probes on measurements are included. Sandler also examines how switching
frequency and duty cycle affect power supply stability as well as EMI.
Cheaper than in-house resources
How can we help you? Contact us for more specific information or a no-obligation quotation.