Wide band amp basics

[Claus Jensen]

I need to build a wide band amp for laboratory experiments.

Could someone with expertise in this area briefly list the design
considerations, trade-offs, etc. for the specs below.

I just need a starting point and idea of what can be practically
achieved without undue cost or complexity, ie. a common op amp and a
few transistors.

Specs:

DC to 10MHz, 100MHz if possible. Single supply operation. Prefer 12V.
Low impedance input, ie. sensor coil with suitable series resistor.
10W output into a resistive load. As much gain as I can reasonably
get.

Thank you,

Claus

 

[Joerg]

Hello Claus,

Check AD and other web sites for app notes. This is no big deal with
opamps anymore these days.

If you need a really stiff output you can use buffers. I bought a whole
lot of LH0063 before they became hard to obtain. These make powerful RF
buffers and go to DC.

Regards, Joerg

 

[Helmut Sennewald]

----- Original Message -----
From: "Claus Jensen" <[email protected]>
Newsgroups: sci.electronics.design
Sent: Wednesday, May 11, 2005 2:35 PM
Subject: Wide band amp basics

I need to build a wide band amp for laboratory experiments.

Could someone with expertise in this area briefly list the design
considerations, trade-offs, etc. for the specs below.

I just need a starting point and idea of what can be practically
achieved without undue cost or complexity, ie. a common op amp and a
few transistors.

Specs:

DC to 10MHz, 100MHz if possible. Single supply operation. Prefer 12V.
Low impedance input, ie. sensor coil with suitable series resistor.
10W output into a resistive load. As much gain as I can reasonably
get.

Thank you,

Claus

Hello Claus,

What is the value of the resistive load?

If your resistor value is 50Ohm, then you need a much
higher supply voltage.

You should be aware of P=U*U/R

U is the effective value of the voltage applied to the load resistor R.

Best regards,
Helmut