Wideband Injection Transformers

A Wideband Injection Transformer is a specialized high-frequency component used to safely inject a test signal into a control loop without breaking the loop or affecting its DC operating point. It provides galvanic isolation between the test equipment (like a Network Analyser) and the circuit being tested, ensuring that the measurement does not interfere with the system’s stability.

Why Choose a Wideband Injection Transformer?

Galvanic Isolation: It prevents ground loops and protects sensitive signal generators from the high voltages often present in power supply circuits.
Flat Frequency Response: These transformers are designed to be "transparent" across a massive range (e.g., 10Hz to 10MHz or more), ensuring the injected signal remains accurate at all frequencies.
Low Insertion Loss: They are engineered to have minimal impact on the circuit’s own characteristics, allowing for a true measurement of the "Loop Gain" and "Phase Margin."
High Input Impedance: They present a minimal load to the signal source, which is critical when performing precise stability analysis on sensitive analog feedback paths.

Core Applications

Power Supply Stability Analysis: The primary tool for measuring the Bode plot of a DC-DC converter or AC-DC power supply to ensure it won't oscillate under different load conditions.
Control Loop Characterisation: Used in motor drives and robotics to measure the transfer function of feedback loops, helping engineers tune PID controllers for maximum performance.
PSRR Testing: Measuring the "Power Supply Rejection Ratio" by injecting a ripple onto the input rail to see how much of that noise reaches the output of a linear regulator or LDO.
Component Impedance Measurement: In-circuit testing of capacitors and inductors at high frequencies to see how they behave under real-world operating voltages.

SKUImageBrandTypesFrequency RangeBandwidthInsertion LossVoltageAdditional FeaturesApplicationStockPrice
TBJT01Image of Tbjt01 current injection transformer telonic ukTekboxInjection Transformer10 Hz – 45 MHz15 Hz – 9 MHz~15.5 dB600V CAT IILow capacitance (90 pF), widebandGeneral-purpose loop stability (Bode analysis)On Backorder£324.00
TBJT02Image of Tbjt02 current injection transformer telonic ukTekboxInjection Transformer1 Hz – 7 MHz2 Hz – 3 MHz~16 dB600V CAT IIBuilt-in 5Ω termination, fuse protectedPrecision low-frequency loop analysisOn Backorder£324.00
TBJT03Image of Tbjt03 telonciukTekboxInjection Transformer50 kHz – 50 MHz50 kHz – 50 MHz≤3 dB @ 50 MHz300V AC, 500V DCHigh power (20W), galvanic isolation, coupling capConducted immunity (MIL-STD-461 CS101)On Backorder£324.00
  • Image of Tbjt01 current injection transformer telonic uk

    TBJT01 WIDEBAND INJECTION TRANSFORMER 10Hz 45MHz

    £324.00 (£388.80 inc. VAT)

    Available on back-order

    Availability: Stock models delivered next working day (UK only) for orders placed before 16:30 (Mon - Fri)

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  • Image of Tbjt02 current injection transformer telonic uk

    TBJT02 WIDEBAND INJECTION TRANSFORMER

    £324.00 (£388.80 inc. VAT)

    Available on back-order

    Availability: Stock models delivered next working day (UK only) for orders placed before 16:30 (Mon - Fri)

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  • Image of Tbjt03 telonciuk

    TBJT03 injection transformer 50 Ω, 10 Hz to 100 MHz

    £324.00 (£388.80 inc. VAT)

    Available on back-order

    Availability: Stock models delivered next working day (UK only) for orders placed before 16:30 (Mon - Fri)

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