Which part of variable gain amplifier can be used ?

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fnx7

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50~860MHz VGA??

Which part of variable gain amplifier can be used in this field?

spec:

frequency band: 50~860MHz
impedance: 75 Ohm
OIP3: 38dBm
gain maximum:at least 15dB
gain adjust range: 20dB

Thanks
 

50~860MHz VGA??

I don't know any part with exactly that specs.

Maybe a solution could be the use of an attenuator+VGA+PA

For example:
10 dB attenuator
+10 to -10 dB gain (19 dBm OIP3 at max gain)
+20 dB PA (>40 dBm OIP3)

Overall:
max gain=20
OIP3=38 dBm

A starting point could be MAX3538 that has 20 dB control range, max gain 10 dB and output IP3 of about 19 dBm at max gain.

It will be a very power hungry circuit, I suppose.

Feasible?

Mazz
 

Re: 50~860MHz VGA??

Thanks Mazz
 

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