J2111B Current Injector / J2112A High Current Injector

J2111B Current Injector	J2112A High Current Injector
High PSRR Low Noise Regulator with Universal input Output Current Variation (Controllable) - 50mA Total Output Current Variation (Controllable+Bias) - 74mA 20nSec typ rise and fall time DC-40MHz usable range (interconnection dependent) Two Quadrant Bipolar operation works with positive or negative source Built in offset for use with Network Analyzer Precision current monitor with 50 Ohm output Works with AWG, Function generator and network analyzer Can be used to measure battery impedance	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

Application Notice
1. Why Current Injectors Oscillate - Video

J2111B

Product Information

The current injector is one of the most versatile of the injector products. Coupled with the G5100A, or other equivalent function generator, it is capable of performing small signal load steps up to 40MHz, with very fast rising and falling edges. Using the G5100A, also allows the rise and fall times to be controlled, various waveforms or even arbitrary waveforms. This can be used to simulate the effects of many different types of loads, including high speed digital circuit loading, which is often largely dynamic.

The J2111B can only sink current. Its output needs to be connected to voltage source usually the output of a power supply. It can (only) sink current for positive or negative voltages. It can have negative modulation with the 25mA bias on. But the 10mA/V input modulation directly controls the output current slew rate.

The current injector can also be used to measure output impedance of power supplies, voltage regulators, power buses and even batteries. It can be used to non-invasively measure the stability of a combined input filter and the negative resistance of a switching power supply. It also has application in the measurement and extraction of transistor data, including small signal 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.

Measuring Output Impedance

The 3-port measurement is hard to calibrate given the nature of the setup and usage of the J2111A/B for current monitoring/sinking. The J2111A/B adds 25mA to load current which may be too large for some references.

It is generally a harder test to setup (often a current probe, which can be noisy is needed) and unlike the 1 or 2-port measurements you can't measure with power off (a useful data set in PDN design).

The current injector has two connections for the output, Output and GND. The input is DC+AC and can be connected to either a signal generator or a network analyzer. A built in bias current enables Class A operation for use with a network analyzer. The Current Injector and DC Bias injector can also be used for this purpose.

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.

When used in conjunction with a voltage probe, the analyzer can measure Voltage/Current, which is the impedance.

Detailed Specifications:

* The J2111B may be connected to power supplies with output voltage ranging from -40V to -1V and 1V to 50V. Between -1V and +1V the J2111B will not work reliably. However, it is recommended that the output voltage remain above 1.5V for all specifications to be in compliance.J2111B increases the allowable voltage to -60 to -1.5 and +1.5 to +60 and improves thermal design.

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.

What’s included

• J2111B Current Injector
• J2171A High PSRR Regulated Adapter
• User manual
• 1 Year Warranty

J2112A

Product Information

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 1A/V scale.

Detailed Specifications

*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.

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.

What’s included

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