Device Overview

General Description

The BT1-0050 is constructed using a custom-made, resonance-free conical inductor to achieve extremely broadband performance. By minimizing the overall inductor size and using proprietary packaging techniques, the BT1-0050 is a superior option in terms of performance, reliability and ease-of-use when compared to cumbersome user-designed bias tees employing off-the-shelf conical inductors. The extremely low cutoff and resonance free operation makes the BT1-0050 suitable for biasing amplifiers, lasers, and modulators driven with high frequency data patterns.

Photo of BT1-0050

Features

  • Broadband: 200 kHz to 50 GHz
  • Low Insertion Loss
  • High Power
  • Non-Resonant
  • Compact Size

Applications

  • Test and Measurement Equipment

Functional Block Diagram

Block Diagram

Part Ordering Options

Part NumberDescriptionConnectorsGreen StatusProduct LifecycleExport Classification
BT1-0050High Power Bias TeeStandard

REACH

RoHS

ReleasedEAR99

Table Of Contents

Revision History

Revision CodeRevision DateComment
B2020-04-01Performance vs Bias current plots
C2021-03-01Updated Spec Table and Low Frequency Plots

Rev: C | Copyright © 2020 - 2021 Marki Microwave LLC.

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Port Configuration and Functions

Port Functions

PortFunctionConnector TypeDescriptionDC Equivalent
Circuit
CommonRF+DC 2.4FThis port is DC blocked to the RF port and DC connected to the DC port through an internal RF choke.Equivalent circuit for the RF+DC
DCDC 2.4FThis port is internally connected to an RF choke which is DC connected to the RF+DC port and DC blocked to the RF port.Equivalent circuit for the DC
RFRF 2.4FThis port is internally DC blocked to the RF+DC and DC ports.Equivalent circuit for the RF

Rev: C | Copyright © 2020 - 2021 Marki Microwave LLC.

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Specifications

Absolute Maximum Ratings

ParameterMaximum RatingUnit
DC Current 1A
DC Voltage 50V
Maximum Storage Temperature 125°C
Minimum Storage Temperature -65°C
RF Power Handling 5W

Package Information

ParameterDetailsRating
Weight-23.5g
Dimensions-15.24 x 36.07 mm

Rev: C | Copyright © 2020 - 2021 Marki Microwave LLC.

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Electrical Specifications

Specifications guaranteed at +25C, measured in a 50-Ohm system

ParameterTest ConditionsMinimum
Frequency
(GHz)
Maximum
Frequency
(GHz)
MinTypMaxUnit
Capacitance -- --100-nF
DC Port Isolation -0.0002 1-50-dB
DC Port Isolation -1 50-30-dB
DC Resistance -- --1-Ω
Inductance -- --330-μH
Insertion Loss -0.0002 0.0003-2-dB
Insertion Loss -0.0003 50-1.52.5dB
Return Loss -0.0002 50-13-dB
Risetime/Falltime 1-- --10-ps

[1] Specified as 90%/10%. Calculated from 𝜏bt2 = (𝜏out2 - 𝜏in2)

Rev: C | Copyright © 2020 - 2021 Marki Microwave LLC.

5

Typical Performance Plots

RF insertion loss (dB) graph for BT1-0050
Return Loss graph for BT1-0050
Low frequency RF response graph for BT1-0050
Low frequency isolation graph for BT1-0050
DC-RF isolation graph for BT1-0050
Near DC isolation graph for BT1-0050
Group Delay graph for BT1-0050
Performance over temperature graph for BT1-0050

Rev: C | Copyright © 2020 - 2021 Marki Microwave LLC.

6

Typical Performance vs Bias Current at Low frequencies

Insertion Loss vs Bias Current graph for BT1-0050
Common Return Loss vs Bias Current graph for BT1-0050
RF Return Loss vs Bias Current graph for BT1-0050

Rev: C | Copyright © 2020 - 2021 Marki Microwave LLC.

7

Time Domain Performance Plots

Oscilloscope measurements of the BT1-0050 with a 10Gb/s PRBS pattern. Eye diagrams are taken with a 231-1 PRBS input demonstrating minimal eye distortion/closure afforded by the extremely low frequency operation of the bias tee.

Oscilloscope measurements of the BT1-0050 with a 10Gb/s PRBS pattern graph for BT1-0050

Rev: C | Copyright © 2020 - 2021 Marki Microwave LLC.

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Mechanical Data

Rev: C | Copyright © 2020 - 2021 Marki Microwave LLC.

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