Forum: Analog Circuits Help in designing RF amplifier with specifications

von anhnhamoi a. (Company: hut) (anhnha)

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Hi, I want to design a RF amplifier with these specifications:
-Operating frequency 1.7- 2 GHz
-Voltage gain: 50dB
-Using MOS transistors

Can anyone help me with some schematics or materials?

von mschoeldgen (Guest)

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50dB ? This is a lot. I'd suggest not using MOS Transistors but two or 
three MMIC in a well shielded casing. Self oscillation will be hard to 
avoid without a proper casing.
Have a look at the stuff from e.g. Minicircuits:

Enter your parameters and the search should return with some usable 
MMIC. Note that a single chip will never give you the desired 
amplification, you'll need several stages. Typical gains in the desired 
frequency range will be around 16 to 20 dB per stage.

von Toto Loco (Guest)

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Output power ?
1dB Compression point ?
Noise figure ?

Without special requirements, I'd go for a series of Minicircuits parts.

von Julian G. (Company: NSW TAFE College Mt Druitt) (my_other_head)

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You might want to consider cascading RF amplifier blocks from various 
manufacturers, eg TriQuint, Avago, Siemens, Freescale, On Semiconductor, 
etc. You won't be able to achieve a stable design of 50dB gain in only 
one amplifier stage - more like 3 or 4 stages.

A useful design and analysis textbook reference for what you want to 
design is: Microwave Transistor Amplifiers: Design and Analysis, 2ed, 
Guillermo Gonzalez, 1997, Prentice Hall ISBN 0-13-254335-4.

Good Luck.

von Julian G. (Company: NSW TAFE College Mt Druitt) (my_other_head)

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Another 3 useful books that I'm using:

1. Microwave Engineering, 3ed, David M. Pozar, JW Wiley, 2005, ISBN 
978-0471-44878-5 hardback. There may be a soft cover edition - look it 

2. Radio-Frequency Electronics: Circuits and Applications, 2ed, Jon B. 
Hagen, Cambridge University Press, ISBN 978-0-521-88974-2 hardback

3. RF Microelectronics, 2ed, Behzad Razavi, Prentice Hall, ISBN-13: 
978-0-13-713473-1 and/or ISBN-10: 0-13-713473-8

Good luck. Study hard.

von Julian G. (Company: NSW TAFE College Mt Druitt) (my_other_head)

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Another two very well recommended books I've only recently become aware 
of, but have not yet seen are:

Author of both books: Dr Steve C. Cripps
Publisher: Artech House (of both books)

1. RF Power Amplifiers for Wireless Communications, Second Edition 
(Artech House Microwave Library)

2. Advanced Techniques in RF Power Amplifier Design

David M. Pozar in "Microwave Engineering", 3ed, Wiley, has a chapter on 
RF amplifiers, as well stability curves, etc.

For an elementary treatment on RF amps, you could try "RF Circuit 
Design", Chris Bowick, 2ed, Newnes Elsevier. But for an RF amp with 50dB 
gain (what's P_in?) you'd be struggling to design an amp from the info 
just in this book. 50dB gain is not trivial.

Another elementary text is "Electronic Communication Techniques", 5ed, 
Paul H. Young, Pearson Prentice Hall, ISBN 0-13-122885-4

Go to it!

von Julian G. (Company: NSW TAFE College Mt Druitt) (my_other_head)

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Have  a look at www.rfdesignhq.com and especially all the blogs on a lna 
amp design

von Julian G. (Company: NSW TAFE College Mt Druitt) (my_other_head)

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Another useful book which I'm using at the moment is:

Design of RF and Microwave Amplifiers and Oscillators, 2ed, Pieter L.D. 
Abrie, Artech House, 2009, ISBN-13: 978-159693-098-8, or ISBN-10: 
1-59693-098-5. Includes a CD-ROM.

If you are designing this professionally, have a look at AMPSA's 
Multimatch design products, www.ampsa.com.


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