RF Project

RF Project - Randall Robert (9771) RF Circuit Deisgn 4002-2...

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Unformatted text preview: Randall Robert (9771) RF Circuit Deisgn 4002-2 Matching Networks 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 , 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 , SWR, % power reflected, % power transmitted and insertion loss (in dB) 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. 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 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 =50 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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This note was uploaded on 01/31/2012 for the course EE 4002 taught by Professor Scalzo during the Fall '06 term at LSU.

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RF Project - Randall Robert (9771) RF Circuit Deisgn 4002-2...

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