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AN548A

更新时间： 2024-11-15 03:18:47
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摩托罗拉 - MOTOROLA 放大器
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8页 100K
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MICROSTRIP DESIGN TECHNIQUES FOR UHF AMPLIFIERS

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M O T OR OLA  
SEMICONDUCTOR APPLICATION NOTE  
Order this document  
by AN548A/D  
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Prepared by: Glenn Young  
power gain of 16 dB and a bandwidth (– 1 dB) of 8 MHz.  
Overall efficiency is 48.5% and all harmonics are a minimum  
of 20 dB below the fundamental output.  
Sections on construction and device handling  
considerations are also presented.  
INTRODUCTION  
This note uses a 25 watt UHF amplifier design as a vehicle  
to discuss microstrip design techniques. The design  
concentrates on impedance matching and microstrip  
construction considerations. A basic knowledge of Smith  
chart techniques is helpful in understanding this note.1  
The amplifier itself, as shown in Figure 1, provides 25  
watts of output power in the 450 – 512 MHz UHF band. It  
is designed for 12.5 volt operation which makes it useful for  
mobile transmitting equipment. A variety of police, taxi,  
trucking and utility maintenance communication systems  
operate in this band.  
MICROSTRIP DESIGN CONSIDERATIONS  
Microstrip design was used for this amplifier due to its  
inherent superiority over other methods at this frequency.  
These techniques not only offer good compatibility with the  
Motorola “stripline” package but they also offer very good  
reproducibility. Microstrip construction is more efficient than  
lumped constant equivalents since microstrip lines are less  
lossy than lumped constant components.  
A summary of the performance of the completed amplifier  
operating with a 12.5 volt supply at 512 MHz indicates a  
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MI CR O STR I P  
L I NE  
5 0 Ω  
C 17  
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All Microstrip lines 5.72 mm wide 2.5 cm long  
L1, L2, L3 – 5 turns #20 Closewound 3/16” I.D.  
C1,2,3  
C4,5,6  
C7,8,9  
470 pF feedthru  
1.0 µF Tantalum  
0.1 µF Ceramic  
L4, L5, L6 – 0.15 µh molded choke  
L7, L8 – Ferroxcube VK 200 20/4B or equivalent  
Ferrite beads are Ferroxcube 56 590 65/3B  
or equivalent  
C10,11,13,15,16,171.5-20 pF Compression Trimmer ARCO 420  
C12,14  
10 pF Microwave capacitor ATC type  
100-B-10-M-MS or equivalent  
Figure 1. Schematic Diagram of 25 W UHF Amplifier  
REV 0  
Motorola, Inc. 1993
12345678

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