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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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Injector Bundles

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J2100A Injection Transformer 1Hz - 5MHz J2101A Injection Transformer 10Hz - 45MHz J2110A Solid State Injector J2120A Line Injector J2130A DC Bias Injector J2111A Current Injector User manual
1 Year Warranty

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J2110AS Solid State Injector J2111AS Current Injector J2120A Line Injector J2130A DC Bias Injector J2140A Attenuator J2170B High PSRR Power Adapter User manual
1 Year Warranty

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J2111A Current Injector J2101A Injection Transformer 10Hz - 45MHz J2120A Line Injector J2140A Attenuator J2170B High PSRR Power Adapter User manual
1 Year Warranty

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J2110AS Solid State Injector J2111AS Current Injector J2101A Injection Transformer 10Hz-45MHz J2102A Common Mode Transformer J2120A Line Injector J2130A DC Bias Injector J2140A Attenuator J2170B High PSRR Power Adapter User manual
1 Year Warranty

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Injector Bundle #1
INJB02
Injector Bundle #2
INJB03
Injector Bundle #3
INJB05
Injector Bundle #5
Usage
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
      J2102A Common
Mode Trans.
2-Port Impedance
         
  What you buy if you already have an injection transformer The Minimum: Covers Stability, PSRR, Impedance Full Suite of Injectors  

Individual Injectors

The product line consists of two Injection Transformers and a high bandwidth Solid-State Voltage Injector useful for stability measurements. In addition, the line includes a unique Solid-State Current Injector used for non-invasive step load and output impedance testing and a Line Injection adapter ideal for measuring PSRR. A DC bias injector useful for component impedance measurements where a voltage bias must be applied is also included. The Picotest line of signal injectors can be used with any manufacturer’s test equipment.

When paired with your network analyzer, function generator and oscilloscope, the injectors can be used to perform the most important voltage regulator tests over a very wide bandwidth (as low as DC and as high as 50MHz). You can measure PSRR, output impedance, stability, and even small signal step load response to 40MHz with 20nS transitions. You can even measure reverse transfer and system level crosstalk. And many of these measurements can be made non-invasively on hardware in its final configuration.

Best of all, these adatpters are low cost. The complete set of injectors, OMICRON Lab Bode-100 analyzer, and Picotest Arbitrary function generator cost less than a Venable or Ridley analyzer alone, and with much greater test capability.

We also offer a test kit to demonstrate each of the voltage regulator measurements and the proper use of the injectors.

If you have an interest in learning more about these injectors, please email us.

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more about our Signal Injectors.

Making Invasive and Non-Invasive Stability Measurements

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.

Non-Invasive Assessment of Voltage Regulator Phase Margin

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.

Essential Test Adapters for Your Network / Impedance Analyzer

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.

Signal Injection Transformers

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.

Deconstructing the Step Load Response Reveals a Wealth of Information

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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