Picotest
Picotest J2120A Line Injector | 10Hz–10MHz PSRR Testing
Picotest J2120A Line Injector | 10Hz–10MHz PSRR Testing
SKU: J2120A
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Key Features
Overview
Overview
The Picotest J2120A Line Injector is engineered for accurate modulation of DC supply voltages, supporting professional measurement of Power Supply Rejection Ratio (PSRR) and input impedance in voltage regulators and power supplies. Operating from 10Hz to 10MHz, its low-loss, passive design allows superior small-signal testing without introducing significant error or distortion to the circuit under test.
Performance & Application
Delivering up to 5A continuous current and tolerating up to 50VDC, the J2120A provides the lowest-impedance injection available, critical for high-accuracy PSRR and filter testing. Unique among line injectors, it directly modulates the supply voltage with minimal insertion loss—ideal for precision verification of linear and switching regulator input filters. Its 180mΩ insertion resistance at 1A ensures low distortion, while non-linear voltage drop is easily managed with remote sense capability using the optional PWR-OPT05 board.
Integration & Series Compatibility
This model is part of the comprehensive Picotest signal injector range, which includes the high-power J2121A High Power Line Injector (400V/20A) for demanding applications and the J2130A DC Bias Injector for capacitance testing. Its remote sensing feature is ideally matched with the Picotest P9610A power supply, ensuring accurate regulation even under heavy test loads.
Why Consider the J2120A?
If consistent, accurate PSRR and input impedance measurements are vital to your design validation, the J2120A offers unmatched bandwidth and reliability among line injectors. Designed for compatibility with industry VNAs and oscilloscopes, it simplifies compliance and benchmarking for advanced power system engineers.
Why Engineers Choose The Picotest J2120A Line Injector | 10Hz–10MHz PSRR Testing
Reliable PSRR Measurement
Low Measurement Impact
Flexible System Integration
| Characteristic | Typical | Units | |
| Maximum DC Input Voltage | 50 | VDC | |
| Maximum Continuous Current | 5 | A | |
| Maximum Voltage Drop | 3.25 |
VDC |
|
| Modulation Input Impedance | 10K | ohms | |
| 3dB Frequency Response | 15-5M | Hz | |
| Useable Frequency Response | 10-10M | Hz | |
| Recommended Injection Signal | -20 - 0 | dBm | |
| Temperature Range | 0-50 | C | |
| Maximum Altitude | 6000 | Ft | |
| Absolute Maximum Voltage | < 50V (DC + AC) | ||
J2120A is the lowest impedance injector on the market and can be approximated by the following relationship to operating current.
Or about 180mOhms at 1Amp
Caution: To avoid equipment damage and/or severe injuries or death ensure that the absolute maximum ratings are observed and not exceeded at all times.
EMI Note: Exceeding 0dBm may cause the unit to exceed CE EMI limits.
Frequently Asked Questions
Have a Question?
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Where can I find detailed application guides?
Comprehensive guides are included and additional resources are available from The Debug Store or Picotest Insights platform.
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Can the device test capacitive and inductive loads?
Yes, it is suitable for analysing both input capacitors and EMI filters when combined with current probing.
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Does the J2120A require special calibration?
No, the J2120A’s passive design ensures stable performance—refer to the included manual for setup recommendations.
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What optional accessories are recommended?
The PWR-OPT05 remote sensing board compensates for non-linear voltage drops, and the Picotest P9610A power supply ensures enhanced regulation.
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Can the J2120A be used for negative voltage rails?
For negative rails, consider the J2123A Negative Voltage Line Injector, also available at Debug Store.
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How does the J2120A compare with high-power injectors?
While the J2120A supports up to 5A/50VDC, the J2121A Power Injector extends capability to 20A/400VDC for power-dense applications.
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Is there a bandwidth limitation for PSRR testing?
The J2120A is optimised for 10Hz–10MHz, ideal for most power management ICs and LDO application scenarios.
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How does low insertion impedance improve testing?
It minimises measurement artefacts, providing more accurate data when assessing power supply input filters.
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Which equipment is compatible with the J2120A?
Compatible with VNAs like the Bode 100, oscilloscopes, and the Picotest series of injectors, including the J2121A Power Liner Injector.
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What is the main application of the Picotest J2120A Line Injector?
The J2120A facilitates PSRR and input impedance measurements, vital for validating voltage regulator performance.