Detailed Specifications

Characteristic	Typical	Units
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 used to load step power supplies with an 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. The J2112A can be used with the J2170A, J2170B, or the J2171A power supplies.

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

Connectors

Input	BNC
Output	Banana

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.

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.