fast rectifier

[Wim Verheyen]

Firstly, thank you, Martin, Juergen and Don for your tips and hints.

>Maybe a lf357 would work, 50V/us. But I can't find an app note
>how to compensate this type.

My National Semiconductor Linear Databook shows circuits for Non-Inverting
and Inverting Unity Gain Operation.
It's a capacitor (C), connected to the "-" input, in series with a resistor 
(R1), connected to the "+" input. R2 is the feedback resistor in both cases.

Non-Inverting : Rs is connected between the input of the circuit and the "+"
input of the op-amp. 

     R2 + Rs   
R1 = -------   		
        4
        
Inverting : R2 is connected between the input of the circuit and the "-"
input of the op-amp.

     R2
R1 = --	
     4

For both configurations :

             1
R1C >= ------------
	(2pi) (5MHz)
	
-3dB frequency is 5 MHz.

Furthermore, this op-amp has no problems with large differential input 
voltages.

BTW, TL07x and TL08x have a slew rate of 13V/us, LM101 is 10V/us.

So far for the technical stuff.

In my original mail, I proposed some module design with a HWR, inverters and
mixers	and asked for opinions of the sonic and control capabilities of such a
module. Any comments ? I can repost the original mail if you don't have it 
anymore.

-------------------------------------------------
 Wim Verheyen, Hasselt, Belgium, catwim at innet.be
 The Aemit modular analog home :
 http://www.club.innet.be/~year0828/wim.html
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