Picotest has introduced a new line of Signal Injectors that enable “hi-resolution” voltage regulator and power supply measurements. Our line of Signal Injectors is the most versatile and sophisticated set of test adapters ever developed. They are an essential part of getting the most out of your network and impedance analyzers whether you are measuring power supplies, regulators, other linear circuitry or components. Order your injectors now!
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|J2100A Injection Trans.||J2110AS Solid State Inj.||Stability (PFC)|
|J2101A Injection Trans.||J2101A Injection Trans.||J2101A Injection Trans.||Stability|
|J2110A Solid State Inj.||J2110AS Solid State Inj.||Stability|
|J2120A Line Injector||J2120A Line Injector||J2120A Line Injector||J2120A Line Injector||PSRR|
|J2130A DC Bias Injector||J2130A DC Bias Injector||J2130A DC Bias Injector||DC Bias/Component|
|J2111A Current Injector||J2111AS Current Injector||J2111A Current Injector||J2111AS Current Injector||NISM/Stability/Step Load|
|J2140A Attenuator||J2140A Attenuator||J2140A Attenuator||Stability|
|What you buy if you already have an injection transformer||The Minimum: Covers Stability, PSRR, Impedance||Full Suite of Injectors|
The Picotest J2111A Current Injector, together with the Bode 100, allows direct measurement of the output impedance, group delay and Q of the system. Using this information, the phase margin of the system can be calculated without breaking the feedback loop of the controller. This method is, therefore, considered “non-invasive.”
In this application note, the results of the non-invasive measurement are compared to the “classical” Bode plot loop gain measurements.
Many voltage regulators are of the fixed output variety and include the voltage divider internal to the regulator. One disadvantage to this architecture is that the voltage divider is not available for Gain-Phase or “Bode” measurements. This leads many to believe that it is not possible, or even necessary to evaluate the stability of such a regulator. Neither of these beliefs is true.
What Signal Injectors should you own to help with those essential measurements?
This article discusses each of the basic injectors that you should own, as well as, some of the measurements where they are all but essential.
What makes the Signal Injection Transformer special?
In this article we’ll take a look at what makes the signal injection transformer special, why an audio or video transformer is not a suitable alternative for most applications and why the injection transformer is not suitable for measuring input ripple rejection (PSRR) or other measurements that allow DC current to flow through the transformer.
What can be learned from the Step Load response and why we should care?
When analyzing power circuits, engineers routinely evaluate the stability using gain-phase measurements also known as bode plots. Many manufacturers of voltage and low-dropout regulators are now doing away with the bode assessment in favor of only the step load response. The two tests are related, however, an incorrect assessment can lead to incorrect performance conclusions and poor resulting system performance.
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