High speed discret amplifier

[smu]

Hello,

I search the best structure about an amplifier that can perform:
* a slew rate of 1000 V/ľs
* an output that can swing between +/- 50V

If someone has some suggestion or some schematic, it would be great.

Thank you in advance

smu

 

[Ken Smith]

In article <4221f633$0$658$626a14ce@news.free.fr>, smu <pas@d.adresse> wrote:

Hello,

I search the best structure about an amplifier that can perform:
* a slew rate of 1000 V/ľs
* an output that can swing between +/- 50V

If someone has some suggestion or some schematic, it would be great.

How linear? Whats the gain got to be? What's the load? Whats the
bandwidth?

It only requires a few tens of MHz to get to 1000V/uS. A fairly simple
common source amplifier using a fast MOSFET could do this.




--
--
kensmith@rahul.net forging knowledge

 

[smu]

Ken Smith a écrit :

In article <4221f633$0$658$626a14ce@news.free.fr>, smu <pas@d.adresse> wrote:

Hello,

I search the best structure about an amplifier that can perform:
* a slew rate of 1000 V/ľs
* an output that can swing between +/- 50V

If someone has some suggestion or some schematic, it would be great.


How linear?

This point is not so critical.

Whats the gain got to be?

The gain must be 8.

What's the load?

The load is a 400 ohms resistor.

Whats the
bandwidth?

A bandwidth of 20 MHz is enough.

It only requires a few tens of MHz to get to 1000V/uS. A fairly simple
common source amplifier using a fast MOSFET could do this.

Good idea.

Thank you

smu

 

[Winfield Hill]

smu wrote...

Ken Smith wrote...
smu wrote:

I search the best structure about an amplifier that can perform:
* a slew rate of 1000 V/ľs
* an output that can swing between +/- 50V

If someone has some suggestion or some schematic, it would be great.

Whats the
bandwidth?

A bandwidth of 20 MHz is enough.

It only requires a few tens of MHz to get to 1000V/uS. A fairly
simple common source amplifier using a fast MOSFET could do this.

Good idea.

Slow down smu, if you want a +/-50V swing (100Vp-p) at 20MHz, that'll
require a slew rate of S = 2pi f A = 6280V/us, which is *not* easy.
If the load includes some capacitance, even 6-feet of coax, you'll
need an output-current capability of i = S C = 6.3E9 * 180pF = 1.1A
peak. Even if your peak-peak need is less than 100V, you may still
find one of these parameters giving you trouble. At any rate, you
may be looking at a fairly-serious RF power amp.


--
Thanks,
- Win

 

[Rene Tschaggelar]

smu wrote:

Hello,

I search the best structure about an amplifier that can perform:
* a slew rate of 1000 V/ľs
* an output that can swing between +/- 50V

If someone has some suggestion or some schematic, it would be great.

Thank you in advance

Another suggestion. Have a a look at some APEX amplifiers.
There is at least one that does 1000V/us.

http://www.apexmicrotech.com

Not cheap but possibly quicker useable than a selfbuilt one.

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

 

[smu]

Winfield Hill a écrit :

smu wrote...

Ken Smith wrote...

smu wrote:


I search the best structure about an amplifier that can perform:
* a slew rate of 1000 V/ľs
* an output that can swing between +/- 50V

If someone has some suggestion or some schematic, it would be great.

Whats the
bandwidth?

A bandwidth of 20 MHz is enough.


It only requires a few tens of MHz to get to 1000V/uS. A fairly
simple common source amplifier using a fast MOSFET could do this.

Good idea.


Slow down smu, if you want a +/-50V swing (100Vp-p) at 20MHz, that'll
require a slew rate of S = 2pi f A = 6280V/us, which is *not* easy.
If the load includes some capacitance, even 6-feet of coax, you'll
need an output-current capability of i = S C = 6.3E9 * 180pF = 1.1A
peak. Even if your peak-peak need is less than 100V, you may still
find one of these parameters giving you trouble. At any rate, you
may be looking at a fairly-serious RF power amp.

I said 20 MHz but I need only 2 MHz so I think I need 1257 V/ľs.
If I have understood the preceding information, the output current
capability must be 80 mA for a 60pF load.

smu