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RF Project - Randall Robert(9771 RF Circuit Deisgn 40022...

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Randall Robert (9771) RF Circuit Deisgn 4002-2 Matching Networks
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Design Project Design matching network, match load to source, nodal Q, design components  verify operation at operating frequency.  Draw circuit showing actual  components. Design Problem Your job is to design different matching networks for a 1.2 GHz RF amplifier with a Z  parameter matrix of: 26.9 14.7 4.5 2.8 469 240 99 127 j j Z j j - - = + - These parameters are provided by the manufacturer assuming the device is placed in a  50   system.  Meaning, the output terminal is terminated with a 50   impedance and  the input Z parameters were measured.  The input terminals were terminated with a 50   impedance and the output Z parameters were measured. If the amplifier is inserted into an RF system without a matching network, and connected  to a transmission line with Z o  = 50  : Determine input  Γ , SWR, % power reflected, % power transmitted and  insertion loss (in dB) Design input and output matching networks for the amplifier. Specifications: The matching networks should provide some DC isolation of the  transistor,  Design broadband networks that do not have a nodal Q larger than the  nodal Q of the amplifier. Design 2 and 3 element, and TL MN for each port For each design: 1. Select components (any combination of R,L,or C) by maneuvering around a ZY  smith chart.  Show your work clearly. 2. Once you have finished your design; determine a new  Γ , SWR, % power  reflected, % power transmitted and insertion loss (in dB)
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3. Sketch the frequency response of the MN on the smith chart from 1.0 GHz to 1.4  GHZ. Begin each new design on a new page, clearly documenting your design approach.  If  you use the ZY smith chart, mark clearly how you arrive at your final answer and  summarize the process in words.   
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Introduction The z-parameter matrix of a 1.2 GHz RF amplifier is defined as follows: - - + - = 127 99 8 . 2 5 . 4 240 469 7 . 14 9 . 26 j j j j Z From the z-parameters calculate Г in , SWR, percentage of power reflected, percent of power transmitted, and the insertion loss when connected to a RF system without a matching network and connected to a transmission line of Z o =50Ω Once the above has been calculated, the procedure of designing a two element matching network for the input and output of the RF amplifier will be thoroughly explained. During the design process the elements will be carefully chosen not to exceed a nodal Q larger than the nodal Q of the amplifier, and still allow for blocking of DC voltages.
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