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? Thanks.
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: http://www.minicircuits.com/products/Amplifiers.shtml 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.
Output power ? 1dB Compression point ? Noise figure ? Without special requirements, I'd go for a series of Minicircuits parts.
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.
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 up. 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.
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!
Have a look at www.rfdesignhq.com and especially all the blogs on a lna amp design
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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