Since transformers (e.g. the J2100A) can be used to impress false signals into a control loop in a frequency range of 1 Hz to 5 MHz or more, this frequency range is insufficient for some applications. The frequency range can be significantly increased with the J2110A semiconductor voltage impression.
For example, a bandwidth of less than 1 Hz may be sufficient for heating control, but bandwidths of 100 MHz and more are essential for linear control with operational amplifiers. Broadband semiconductor impressions are necessary for such controls. These impression circuits can be used from DC up to a frequency that is only determined by the structure (PC board material and layout) and the components used. Bandwidths of DC to 200 MHz can be achieved. Above 50 MHz, the connection between the insertion and the circuit to be tested can become very critical. It is important that the ripple of the power supply of the imprint circuit does not affect the dynamic range or the signal-to-noise ratio of the measurement. The measurement results are often better when semiconductor imprint circuits such as the J2110A are used instead of transformers.
Choosing the right imprint point in the circuit under test is much more critical than with a transformer. The imprint circuit has undefined impedances at the impedance point. To obtain clear measurement results, one side must offer a higher impedance than the other. In a typical power supply control, the voltage divider for the control loop has a limited voltage range and is therefore the appropriate point for an imprint because the output impedance of the power supply is much lower than the impedance of the voltage sensor of the control loop.
The output voltage level of the semiconductor imprinting circuit has a limit of 10 V or 12 V, which is not the voltage amplitude of the impressed signal (positive or negative).
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