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What is the difference between opamp and RF amplifier?

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what is RF amplifier?

Hi, all,
I am a newbie in RF, and want to know what is the difference between normal opamp and RF amplifier. To construct a power amplifier after antenna, must i use an RF amplifier at 433 mhz? If yes, please recommend a few model.
Thanks.

T. Cambrige
 

Re: what is RF amplifier?

useful document on introduction to Power Amplifiers attached &
Good books for PA design are
1 RF Power Amplifiers for Wireless Communications
By: Steve C. Cripps

2 Advanced Techniques in RF Power Amplifier Design
By: Steve C. Cripps


3 RF CMOS Power Amplifiers Theory, Design & Implementation
By: Hella & Ismail


4 Distortion in RF Power Amplifiers by:Joel & Timo


5 High Linearity RF Power Amplifiers Design
By: Kennington
 

Re: what is RF amplifier?

An amplifer is an amplifier not matter what frequency. It essence
an op-amp is not difference than an RF amplifier. When you use
a single transistor it does not have a differencial input but still is
a feedback type of amplifier. What happen is: in high frequency the
capacitance between output and input creates a feedback that render
the opamp unuseful. The RF transistor correct that in some way.
Nowdays, there are opamp working up to 1Ghz but
they still very expensive compared to a single transistor(FET, etc).
 

Re: what is RF amplifier?

Thanks for all your reply.
If not using RF amplifier, could I put a class A amplifier just after the antenna to increase the receive sensitivity? I am using a similar circuit as in the following link **broken link removed**

Thanks.

T. Cambridge
 

Re: what is RF amplifier?

No luck.
Is TSH690 of STMicroelctronics suitable?
I would like to construct a power amplifier for a AM receiver. The building block sequence would be Antenna---->BPF--->PA--->Envelop detector--->Comparator.
Would this work?
Please help on this issue.
Thanks.

T. Cambridge

Added after 1 hours 54 minutes:

I would like to use some low current substitutes for TSH690. Anyone recommend?
I googled '40MHz to 1GHz AMPLIFIER', but not found.
Maxim, national, linear dont have either.
Seems only ST doing this, am i right?

T. Cam
 

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