Rev: E | Copyright © 2011, 2014, 2019 - 2020 Marki Microwave LLC.

General Description

The BAL-0003SMG is a broadband surface mount balun, hand-tuned for optimal phase and amplitude balance over a 500 kHz to 3 GHz bandwidth. It serves as an excellent choice for analog to digital converters, balanced receivers, baseband digital modulations, and signal integrity enhancement.

Features

  • 2:1 Impedance Ratio
  • 200 kHz to 3 GHz Balun (Balanced to Unbalanced Transformer)
  • Matched 50 Ohm Impedance on Input and Output Ports
  • Tuned for Optimal Phase/Amplitude Balance

Functional Block Diagram

Block Diagram

Electrical Performance Summary

ParameterTypUnit
Frequency Range0.0002 to 3GHz
Insertion Loss as a Mode Converter 4dB
Phase Balance 1°
Amplitude Balance 0.05dB
Impedance Ratio 2:1-
Common Mode Rejection 45dB

Summary only – refer to the Electrical Specifications, Absolute Maximum Ratings, and Recommended Operating Range tables for complete details.

Part Ordering Options

Part NumberDescriptionConnectorsGreen StatusProduct LifecycleExport Classification
BAL-0003BROADBAND BALUN (200 kHz to 3 GHz)Standard

REACH

RoHS

ReleasedEAR99

Table Of Contents

Time Domain Performance Plots

Oscilloscope measurements of the BAL-0003 with a 2.5 Gb/s PBRS pattern. Bit pattern is measured with a 27-1 PBRS input demonstrating extremely good pulse fidelity for both inverted and non-inverted output. Eye diagrams are taken with 231-1 PBRS input demonstrating minimal eye distortion/closure afforded by the extremely low frequency operation of the balun (<200 kHz).

Oscilloscope measurements of the BAL-0003 with a 2.5 Gb/s PBRS pattern graph for BAL-0003

Typical Performance Scattering Parameters

Three port scattering parameters measured as three single-ended 50Ω ports showing relationship between any two ports. For example: S21 and S31, often referred to as insertion loss of a balun, is the output response on ports 2 and 3 with an input stimulus on port 1.

Common to output port insertion loss and output to output port Isolation graph for BAL-0003
Return loss for common port and output ports graph for BAL-0003
Amplitude balance between output ports graph for BAL-0003
Phase balance between output ports graph for BAL-0003
Common mode rejection graph for BAL-0003

Mixed Mode Scattering Parameters

Mixed mode scattering parameters are used to characterize differential circuits. For baluns, this means that the 0° and 180° ports become a single 100Ω differential port and the common port remains the same 50Ω common port. The two-port s-parameters of the balun are then characterized based on differential (d), common mode (c), or single-ended (s) signals. For example: S12ds is the differential output response given a single ended input.

S11dd graph for BAL-0003
S11dc graph for BAL-0003
S12ds graph for BAL-0003
S11cd graph for BAL-0003
S11cc graph for BAL-0003
S12cs graph for BAL-0003
S21sd graph for BAL-0003
S21sc graph for BAL-0003
s22ss graph for BAL-0003

Specifications

Electrical Specifications

Specifications guaranteed from -55 to +100°C, measured in a 50Ω system.

ParameterTest ConditionsMinimum
Frequency
(GHz)
Maximum
Frequency
(GHz)
MinTypMaxUnit
Frequency Range-0.0002 3---GHz
Amplitude Balance -0.0002 3-0.050.5dB
Common Mode Rejection -0.0002 33545-dB
Impedance Ratio -- --2:1--
Insertion Loss as a Mode Converter -0.0002 3-45dB
Isolation -0.0002 3-8-dB
Nominal Phase Shift -0.0002 3-180-°
Phase Balance -0.0002 3-15°
Risetime/Falltime 1-0.0002 3-48-ps
VSWR (Input) -0.0002 3-8--
VSWR (Output) -0.0002 3-1.7--

[1] Specified as 90%/10%. Calculated from Tau_balun2 = (Tau_out2 – Tau_in2)

Absolute Maximum Ratings

ParameterMaximum RatingUnit
RF Power Handling 1W

Package Information

ParameterDetailsRating
Weight-26g
Dimensions-66.04 x 16.76 mm

Port Configuration and Functions

Port Functions

PortFunctionConnector TypeDescriptionDC Equivalent
Circuit
Common Port / In (Unbalanced)RF Input SMAFThe common port is DC short to ground.Equivalent circuit for the RF Input
Out 1 / 0° Port (Balanced)0° Port SMAFThe 0o port is DC short to ground.Equivalent circuit for the 0° Port
Out 2/ 180° Port180° Port SMAFThe 180o port is DC short to ground.Equivalent circuit for the 180° Port

Mechanical Data

Outline Drawing

Download : Outline 2D Drawing Outline 3D Drawing Outline 3D STP

Outline Drawing

Revision History

Revision CodeRevision DateComment
-2011-01-01Datasheet initial Release
A2014-01-01Typical Performance plots added
B2019-10-01Mixed Mode Scattering Parameters added
C2019-11-01RoHs Compliant assembly
D2020-07-01Specs Table Update
E2020-10-01Specs Table Update

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