Applications:
* w/optional Bias Tee 

Features:


Description:PRL's Signal Conditioning Kits enable quick and easy fabrication of custom signalconditioning circuits for RF and highfrequency digital signals. SMA models run up to 5 GHz, and BNC models run up to 3 GHz. There are three PCB layouts, each with different connector type and gender option:
Applications include attenuators, filters, DC blocks, feedthru 50 Ω terminations, etc. They can be used to build commonlyused circuits, such as a 50 Ω shunt termination, or to build oneof akind fixtures not commercially available. Three PCB designs (π, T and multipole) enable easy construction of nearly any series and or parallel network. The doublesided footprint (identical on both sides of the PCB) allows nonstandard resistor, inductor, and capacitor values to be fabricated easily and economically. With the addition of a Bias Tee, active device test fixtures can be built as well. In one example, we easily fabricated a 24 dB attenuator with nonstandard impedance for the interface between a vacuum tube output and a TTL input circuit, using a twostage design with discrete SMT resistors. In another example, we levelshifted a 6V to +10V pulse to 0V to +16V for driving a high impedance circuit. In this case, we constructed a simple DC Restorer using a coupling capacitor and a shunt Schottky diode to ground. Other examples include a feedthrough decoupling capacitor, using one shunt capacitor to make an ideal low pass filter for noise reduction at I/O ports. The kits can be populated with as few as one series component, or as many as 28 series and shunt components, enabling a wide range of applications. Five available connector styles (BNC M/F, BNC F/F, SMA M/F, SMA F/F, and SMA M/M) and a lowprofile design enable inline insertion into your transmission line, with or without cables. Male/male styles are available for the SMA π and T configurations only. A gender changer may be used to create a M/M style for other configurations. For BNC models a metal tube enclosure provides protection and shielding. A toothed washer and nut secure the enclosure and provide DC contact. For SMA models an extruded rectangular enclosure is provided. The enclosure makes contact by friction, and can be secured with a cyanoacrylate adhesive (Superglue) or epoxy. Contact conductance ensures DC connectivity, and the capacitive coupling between the SMA body and enclosure provides AC connectivity. 
Diagrams show all possible component positions on both sides of PCB. Unpopulated series positions may require 0 Ω jumpers. This page may also be printed out and used as a worksheet. Schematics of sample applications are available here.
Fig 1a: π Network Component Positions
Fig 1b: T Network Component Positions
Fig 1c: Multipole Network Component Positions
Schematics:
Diagrams show only the component positions used in the specified circuit. Unpopulated series positions may require 0 Ω jumpers. Diagrams showing all possible component positions are available here. Component values calculators are available here.
Application  Schematic  Kit Type  

Pi  Tee  Multi  
DC Block/Coupling Cap  Y  Y  Y  
AC Block/RF Choke  Y  Y  Y  
Series Termination  Y  Y  Y  
Shunt Termination  Y  Y  Y  
Precision Shunt Termination  Y  Y  Y  
Feedthrough Decoupling Cap  Y  Y  Y  
Diode Detector  Y  Y  Y  
Attenuator  Y  Y  Y  
Lowpass Filter  N  Y  Y  
Highpass Filter  N  Y  Y 
Online Filter and Attenuator Calculators:
 Bandpass Filter Calculator by Raltron
 Highpass/Lowpass/Bandpass/Bandstop/Notch Filter Calculator by Dale Heatherington, with frequency plots
 LC Filter Tutorial and Calculator by the late Prof. Tony Fisher (nonprofit use only)
 Pi/T Attenuator Calculator and Equations by RFCafe.com
 MinimumLoss Attenuator Calculator by Ernie Kim
These calculators will provide schematics and ideal component values for a variety of filter types (e.g. Butterworth, Chebyshev/Tchebysheff, Bessel) and attenuator configurations. Some will also provide response curves.
To implement the desired design with standard components, it may be necessary to use multiple component values in series or parallel configurations to approximate the calculated values. For example, the design for a 6 dB 50 Ω attenuator calls for a 37.4 Ω resistor, a value that is not commonly available. The attenuator can instead be built with two 75 Ω resistors in parallel, producing a very good 6 dB attenuator from standard components:
"Ideal" 6 dB Attenuator Design  Actual 6 dB Attenuator Implementation 
A more complete Attenuator Application Note describes these techniques in more detail, including examples of many commonlyrequired attenuation ratios, measured performance, and oscilloscope captures.
(0° C ≤ T_{A} ≤ 35° C)*
BNC Kits
Parameter  π Network  T Network  Multipole 

Maximum series components  2  4  8 
Maximum shunt components  8  12  20 
Length, including BNC connectors  68 mm/2.7 in  68 mm/2.7 in  78 mm/3.1 in 
Diameter, including hex nut for cover  16 mm/0.6 in  16 mm/0.6 in  16 mm/0.6 in 
SMA Kits
Parameter  π Network  T Network  Multipole 

Maximum series components  2  4  8 
Maximum shunt components  8  12  20 
Length, including SMA M/F connectors  38 mm/1.5"  52 mm/2.1"  
Length, including SMA F/F connectors  35 mm/1.4"  49 mm/2.0"  
Length, including SMA M/M connectors  41 mm/1.6"  N/A  
Crosssection (W x H), including cover  11.18 mm x 9.40 mm/0.44" x 0.37" 