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peterVM
Joined: 20 Jan 2005
Posts: 8
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 20 Jan 2005 11:36 Variable gain amplifier |
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Does anyone know about a good book or article about designing a variable gain amplifier at RF frequency ?
And perhaps with a flat phase response versus gain variation ?
/Peter
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wee_liang
Joined: 04 Jan 2005
Posts: 26
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| 21 Jan 2005 6:34 Re: Variable gain amplifier |
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| It was pretty difficult to get any books talking about VGA (I wonder why), but I eventually found something to read about in the Paul Horowitz (Art of Electronics .. sorry I can't remember the title well).
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peterVM
Joined: 20 Jan 2005
Posts: 8
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| 26 Jan 2005 11:36 Re: Variable gain amplifier |
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Thanks a lot. I will try to get a hold of the book. If others should be interested the book is : "The Art of Electronics, by Paul Horowitz, from Cambridge University Press, from 1989 and reprinted in 1993".
Have you (wee_liang) by any chance designed a VGA ?
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wee_liang
Joined: 04 Jan 2005
Posts: 26
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| 28 Jan 2005 0:51 Re: Variable gain amplifier |
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Yes.
But you can post your queries on the forum, you'll be surprise at the number of people who have done it ( I think).
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rongli
Joined: 13 Dec 2004
Posts: 35
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| 28 Jan 2005 6:31 Variable gain amplifier |
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| I found that IEEE has many topic about this,you can find it there.
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Vamsi Mocherla
Joined: 06 Sep 2004
Posts: 478
Helped: 61
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| 12 Feb 2005 9:38 Re: Variable gain amplifier |
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| I am also interested to get some information about VGA. I tried NATSem, they have some good info
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strabush
Joined: 10 Apr 2002
Posts: 83
Helped: 6
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| 13 Feb 2005 8:57 Re: Variable gain amplifier |
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What frequency range are you talking about?
For HF frequencies (0 to 50MHz) you can check application notes about the Analog Device AD60x series of IC's.
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MLR67
Joined: 13 Feb 2005
Posts: 61
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| 13 Feb 2005 20:22 Re: Variable gain amplifier |
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I remember a good article from B.Gilbert about this topic , but i can't remeber the title.
Maybe someone knows this article.
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andy2000a
Joined: 18 Jul 2001
Posts: 756
Helped: 7
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| 14 Feb 2005 8:06 Variable gain amplifier |
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as I know ,
1 use High gain OPA + switch resistor
2 use GM amp and tunning current
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peterVM
Joined: 20 Jan 2005
Posts: 8
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| 14 Feb 2005 12:38 Re: Variable gain amplifier |
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I am talking about a frequency of about 1.6 GHz, so application notes about VGA's for 0 - 50 MHz is probably not really going to help me, but thanks anyway.
I have actually been simulating a gilbert cell in cadence with good results. With the right trimming it has a high dynamic range (large variable gain) while maintaining a low phase variation with varying gain, which I need.
Has anyone had luck with another configuration than a gilbert cell for a VGA at more than 1 GHz ?
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FANT
Joined: 27 Feb 2002
Posts: 340
Helped: 10
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| 15 Feb 2005 21:48 Re: Variable gain amplifier |
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I have used with good results the following IC:
PM 2701 from Pacific Monolithics.
It is working from 800 to 4500 MHz.
30 dB max attenuation.
Mandi
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