2 stage amplifier

[sthim]

Hi,

In a two stage microwave amplifer, how so you design the interstage
matching network. The first stage already works, and I need to
increase the gain. I am not sure how do design the second stage.
What do I need to consider when the design the second stage - the
interstage matching network, output matching network etc...

sthim

 

[Active8]

On 29 Jan 2004 14:54:13 -0800, sthim2003@yahoo.com said...

Hi,

In a two stage microwave amplifer, how so you design the interstage
matching network. The first stage already works, and I need to
increase the gain. I am not sure how do design the second stage.
What do I need to consider when the design the second stage - the
interstage matching network, output matching network etc...

sthim

That MMIC thing? Was that you? You could use a Wilkinson divider to

match to a bunch of identical ERA-whatevers in parallel and use a
Wilkinson divider as a combiner to get that 40dBm (?) output.
--
Best Regards,
Mike

 

[Active8]

On Thu, 29 Jan 2004 23:50:13 GMT, mTHISREMOVEcolasono@earthlink.net
said...

On 29 Jan 2004 14:54:13 -0800, sthim2003@yahoo.com said...
Hi,

In a two stage microwave amplifer, how so you design the interstage
matching network. The first stage already works, and I need to
increase the gain. I am not sure how do design the second stage.
What do I need to consider when the design the second stage - the
interstage matching network, output matching network etc...

sthim

That MMIC thing? Was that you? You could use a Wilkinson divider to
match to a bunch of identical ERA-whatevers in parallel and use a
Wilkinson divider as a combiner to get that 40dBm (?) output.

No. That was someone else. You're the reflection coeficient guy.

You plot the relection coefficient that the output and input of
next stage want to see on a Smith chart and connect the dots with
inductances and capacitances and/or transmission line transformers.
--
Best Regards,
Mike

 

[gwhite]

sthim wrote:

Hi,

In a two stage microwave amplifer, how so you design the interstage
matching network. The first stage already works, and I need to
increase the gain. I am not sure how do design the second stage.
What do I need to consider when the design the second stage - the
interstage matching network, output matching network etc...

For small signal amplification at the "front end," conjugate matching is pretty
much the universal technique. One typically starts with the s-parameters and
goes from there.

 

[sthim]

Active8 <mTHISREMOVEcolasono@earthlink.net,invalid> wrote in message news:<MPG.1a8367aff7258414989904@news.east.earthlink.net>...

On Thu, 29 Jan 2004 23:50:13 GMT, mTHISREMOVEcolasono@earthlink.net
said...
On 29 Jan 2004 14:54:13 -0800, sthim2003@yahoo.com said...
Hi,

In a two stage microwave amplifer, how so you design the interstage
matching network. The first stage already works, and I need to
increase the gain. I am not sure how do design the second stage.
What do I need to consider when the design the second stage - the
interstage matching network, output matching network etc...

sthim

That MMIC thing? Was that you? You could use a Wilkinson divider to
match to a bunch of identical ERA-whatevers in parallel and use a
Wilkinson divider as a combiner to get that 40dBm (?) output.

No. That was someone else. You're the reflection coeficient guy.

You plot the relection coefficient that the output and input of
next stage want to see on a Smith chart and connect the dots with
inductances and capacitances and/or transmission line transformers.

I am a little confused. How do I find the input and output reflection
coefficient of the next stage? Once I find them what do I match them
to???

Thanks,
sthim

 

[Active8]

On 30 Jan 2004 11:23:08 -0800, sthim2003@yahoo.com said...

Active8 <mTHISREMOVEcolasono@earthlink.net,invalid> wrote in message news:<MPG.1a8367aff7258414989904@news.east.earthlink.net>...
On Thu, 29 Jan 2004 23:50:13 GMT, mTHISREMOVEcolasono@earthlink.net
said...
On 29 Jan 2004 14:54:13 -0800, sthim2003@yahoo.com said...
Hi,

In a two stage microwave amplifer, how so you design the interstage
matching network. The first stage already works, and I need to
increase the gain. I am not sure how do design the second stage.
What do I need to consider when the design the second stage - the
interstage matching network, output matching network etc...

sthim

That MMIC thing? Was that you? You could use a Wilkinson divider to
match to a bunch of identical ERA-whatevers in parallel and use a
Wilkinson divider as a combiner to get that 40dBm (?) output.

No. That was someone else. You're the reflection coeficient guy.

You plot the relection coefficient that the output and input of
next stage want to see on a Smith chart and connect the dots with
inductances and capacitances and/or transmission line transformers.

I am a little confused. How do I find the input and output reflection
coefficient of the next stage? Once I find them what do I match them
to???

Thanks,
sthim

Didn't you do that search for linvall / rolette and small signal

amp design I suggested? I guess not. You get the coefficients from
the s-param data and the design equations and match output of stage
1 to input of stage 2.
--
Best Regards,
Mike