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Key Features

  • Fast Transient Load Stepping up to 1Amp
  • 20nSec typ rise and fall time
  • DC-40MHz usable range (interconnection dependent)
  • Measures Non-invasive phase margin, Output impedance, reverse transfer, crosstalk, input filter stability
  • Works with positive voltage sources
  • Built in offset for use with Network Analyzer
  • Precision current monitor with 50 Ohm output
  • Works with any manufacturer’s AWG, Function generator and network analyzer
  • Includes High PSRR Low Noise Regulator with Universal input

What’s included

  • J2112A High Current Injector
  • J2171A High PSRR Regulated Adapter
  • User manual
  • 1 Year Warranty



The J2112A Current Injector is an extremely versatile tool addition to the Picotest Signal Injector line-up. Coupled with the G5100A AWG, or other equivalent function generator, it is capable of performing small and large-signal load steps up to 40MHz, with up to 20ns rise/fall times, and with currents up to 1amp. Rise and fall times can be controlled and arbitrary waveforms can be used to drive the injector producing load current profiles of virtually any characteristic pattern. This is ideal for emulating all types of load conditions, including high-speed digital circuit loading, battery discharge profiles, or spontaneous current spikes.


When coupled with a network analyzer, the Current Injector can be used to measure the output impedance of all types of circuits and systems including power supplies, voltage regulators, power buses, and batteries. It can be used to NON-INVASIVELY measure the stability of a combined input filter /negative resistance of a switching power supply or the phase margin of a linear or switching regulator WITHOUT the need to break the control loop.


It also supports applications in the measurement and extraction of transistor data, including current gain, Ft, and many other dynamic performance parameters. In RF and instrumentation circuits it can be used to provide constant current biasing for class A amplifiers and buffers.


The Ultimate Controllable Current Source

The controlling input is an arbitrary user controlled DC+AC signal that can be taken from either a signal generator or network analyzer. A built-in bidirectional bias current enables Class A operation for use with network analyzers.


The output current is reduced 40dB from the input signal, resulting in 10mA/V scaling. The current monitor output port is designed to be terminated into 50 Ohms and can be used with the network analyzer, an oscilloscope or a DMM to monitor the output current of the injector on a 0.1A/V scale.


Questions? Don’t hesitate to contact us

Picotest J2112A High Current Injector

  • Max Input Voltage DC+AC +5 V
    Max Output Current +1 A
    Min Output Current 0 mA
    Max Output Voltage 0.7 – 50 * V
    Current Monitor 0.1 V/A
    Modulator Gain 0.2 A/V
    Offset Current (typical) +240 mA
    -3dB Bandwidth (-10dBm) DC-50 MHz
    Temperature Range 0-50 C
    Maximum Altitude 6000 Ft
    Absolute Maximum Voltage < 50VAC and 75VDC  

    *The J2112A may be connected to power supplies with output voltage ranging from 0.7V to 50V. Below 0.7V the J2112A will not work reliably. However, it is recommended that the output voltage remain above 0.9V for all specifications to be in compliance.


    Mechanical Characteristics

    Dimensions (box only) 109.22 mm x 89.66 mm x 50.80 mm
    4.30” x3.53” x 2.00”
    Dimensions (box + connectors) 122.68 mm x 89.66 mm x 50.80 mm
    4.83” x3.53” x 2.00”
    Weight 0.210 kg / 0.463 lbs


    Input BNC
    Output Banana

    To avoid equipment damage and/or severe injuries or death ensure that the absolute maximum ratings are observed and not exceeded at all times.


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