Picotest J2111A current injector 40MHz, 50mA, 74mA (+bias)

Product overview

The current injector is one of the most versatile products of its kind. When used in conjunction with the G5100A generator or other equivalent function generator, it allows small signal load steps up to 40MHz, with very fast rising and falling edges. The use of the G5100A generator also makes it possible to control signal rise and fall times, various waveforms and even arbitrary waveforms. This can be used to simulate the effects of many different types of loads, including loads of high-speed digital circuits, which are often highly dynamic.

The current injector can also be used to measure the output impedance of power supplies, voltage regulators, current rails 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 is also used in measuring and extracting transistor data, including small-signal current gain, Ft and many other dynamic operating parameters.

In RF and instrumentation circuits, it can be used to provide constant bias current to Class A amplifiers and buffers.

Key features

• High PSRR, low-noise regulator with universal input
• Output current variation (adjustable) - 50mA
• Total output current variation (controllable+Bias) - 74mA
• Typical rise and fall time of 20nSec
• DC-40MHz usable range (connection dependent)
• Bi-quadrant bipolar operation with positive or negative signal 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

Input impedance measurement

The current injector has two output connectors: Output and GND. The input is DC+AC type and can be connected to a signal generator or network analyzer. The built-in current bias function allows Class A operation using a network analyzer. The current injector and DC Bias injector can also be used for this purpose.

The output current is reduced by 40dB relative to the input signal, resulting in a scaling of 10mA/V. The current monitor is rated for up to 50 Ohms and can be used with a network analyzer, oscilloscope or multimeter.

In combination with a voltage probe, the analyzer can measure the voltage/current value, or impedance.

Selected parameters