HL8444 Broadband Kelvin Bias Tee (50 kHz to 40 GHz, 175 mA)


Datasheet PDF S-parameters

The HL8444 is an ultra-broadband Kelvin bias tee including a sense port, with a maximum insertion loss of 1.75 dB from 35 kHz to 40 GHz.

A typical bias tee allows for insertion of a DC bias current into a circuit with minimal perturbation of a 50 Ω transmission line, but can suffer measurement errors due to voltage drop across the DC coil.

A Kelvin bias tee is designed for applications where both DC and RF signals are applied to the Device under Test (DUT) and precision DC measurements are required. It eliminates DC biasing errors as the sense coil allows accurate measurement of the DC voltage applied across the DUT.

Applications include 112 Gbps PAM4 communications systems, optical communication systems, high-speed data systems, level shifting, cascading, and interfacing between devices with incompatible DC operating points.

This part is available as matched pairs or individual units with breakdown voltage of 11 V or 30 V and a variety of connector configurations.

Key Specifications (typical)
Bandwidth 50 kHz to 40 GHz (opt. -11)
85 kHz to 40 GHz (opt. -30)
Amplitude Match ± 0.2 dB, f ≤ 40 GHz (opt. -M)
Phase Match ± 4 degrees, f = 40 GHz (opt. -M)
Insertion Loss < 1.75 dB, nominal, f ≤ 40 GHz
Return Loss > 15 dB, f ≤ 35 GHz
> 10 dB, 35 GHz < f ≤ 40 GHz
Max Current 175 mA
Connectors 2.92 mm
RoHS Compliant Yes
REACH Compliant Yes
Warranty 1 year, repair or replacement

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