Picotest
Picotest J2101A Wideband Injection Transformer
Picotest J2101A Wideband Injection Transformer
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Key Features
- 45MHz high enough for even state of the art regulators
- 23 Octave range
- Low distortion for superior precision
- 50 Ohm termination for minimum impact to loop
- Includes attenuation to assure small signal measurement
Overview
The Picotest J2101A is used to inject a signal, normally into a control loop to measure the stability of DC-DC converters. It has been designed with a bandwidth from 10Hz to 45MHz and is frequently used with a Vector Network Analyser.
Picotest offers two different injection transformers specially optimized for different applications. Both are constructed with materials that are superior to most other injection transformers, resulting in greatly improved bandwidth, durability, and overall performance. The usable bandwidth of the Picotest injection transformers is greater than the 3dB frequency limits.
Product Information
The J2101A Injection Transformer is presently the prevalent method for connecting the network analyzer to the circuit being tested, and is primarily used for control loop stability measurements. The goal of the transformer is to inject a signal into the control loop being measured, without impacting the performance of the loop. In order to accomplish this to a reasonable degree, The transformer is isolated and therefore is capable of floating on a high voltage, such as a Power Factor Corrector (PFC), which is often close to 400VDC. Measuring voltages that exceed the voltage rating of the FRA inputs require attenuation probes.
The usable bandwidth of an injection transformer is generally significantly greater than the 3dB frequency limits. This is because the transformer itself is outside of the measurement, leading many to incorrectly believe that the transformer is a non-critical element.
The bandwidth of the transformer is strongly related to the terminating impedance. The most network analyzers provide a 50 Ohm oscillator source impedance. Assuming this impedance the optimal termination resistor is 5 Ohms. This significantly attenuates the injection signal, which is generally beneficial, as a common error in Bode measurements is using a signal which is too large, and therefore not a small signal measurement. An added benefit of this low value is that it can generally be left in circuit at all times, simplifying the connection to the network analyzer without appreciably impacting the output voltage of the circuit being tested.
Detailed Specifications
| Performance at -10dBm input level | |
| Characteristic | Rating |
| DCR | |
| Ratio | 1:1 |
| Termination Impedance | 5 Ohms |
| Usable Bandwidth | 10Hz - 45MHz (Terminated into 5 Ohms) 60Hz - 45MHz (Terminated into 50 Ohms) |
| Isolation Voltage | 600V |
| Isolation Capacitance | 150pF@1KHz |
| DC Current | 10mA |
| Temperature Range | 0 ~ 50°C |
| Maximum Altitude | 6000 Ft |
Note: The upper end of the bandwidth is heavily dependent on the interconnect between the Injector and the DUT.
Frequently Asked Questions
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