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.
Downloads
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.
Questions and Answers
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Can the J2120A Be Used for Negative Voltage Rails?
No. For negative rails, use the J2123A Negative Voltage Line Injector, also available from Debug Store.
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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 has enough remote sense compliance to use it.
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Does the J2120A Require Special Calibration?
No. The J2120A is a passive design. See the included manual for setup recommendations.
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Can the Device Test Capacitive and Inductive Loads?
Yes. Combined with current probing, it can analyse both input capacitors and EMI filters.
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Where Can I Find Detailed Application Guides?
A user manual is included with the product. More resources are available from Debug Store or the Picotest Insights platform.
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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.
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Which Equipment Is Compatible with the J2120A?
It works with VNAs such as the Bode 100.
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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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Is There a Bandwidth Limitation for PSRR Testing?
Yes. The J2120A is optimised for 10Hz to 10MHz, which covers most power management IC and LDO applications.
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How Does the J2120A Compare with High-power Injectors?
The J2120A supports up to 5A/50VDC. The J2121A Power Injector extends this to 20A/400VDC for power-dense applications.
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