The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Design >> Analog Design >> Inductive Peaking
https://designers-guide.org/forum/YaBB.pl?num=1320946539

Message started by summi on Nov 10^th, 2011, 9:35am

Title: Inductive Peaking
Post by summi on Nov 10^th, 2011, 9:35am

Dear Forum,
Can any one please tell me on what basis we have to choose inductor value in a peaking amplifier? There are some value's of 'm' in books, Which one is the best for design.

Br,
Summi.

Title: Re: Inductive Peaking
Post by raja.cedt on Nov 10^th, 2011, 10:26am

Hello,
Please note that you have to describe your question, for example some prople may not be femilier with m, i guess it will be R*R*C/L.

So coming to your Question it depends on the application, for example if you want to design pulse amplifiers, you have to chose inductor in such a way that m=3.1, for max BandWidth it should be 1.41. You find can more details in TH lee book.

Thanks,
Raj.

Title: Re: Inductive Peaking
Post by summi on Nov 10^th, 2011, 10:35am

Dear Raja.cedt,

thanks for your reply. What is the max BW we can achive with the inductive peaking, is there any limit on that?

Br,
Summi.

Title: Re: Inductive Peaking
Post by raja.cedt on Nov 10^th, 2011, 10:45am

hello,
without peaking, you can use 1.41 as i explained in the previous post. but you can get more BW but you have to compremise on peaking in magnitude responce. But accodring to bode integral max BW you can 2 times (accoring to theory) than without inductor case.

I forgot where i read this concept, otherwise i would have given the reply.

Thanks,
Raj.

Title: Re: Inductive Peaking
Post by loose-electron on Nov 10^th, 2011, 11:03am

get a more detailed model of the inductors with parasitics in the models.

This limits the "good" frequency range of the inductor.

In a similar manner, get a model for the capacitor as well.

using those you can determine an LC that will work properly at the frequency of interest.

Title: Re: Inductive Peaking
Post by Harry Poll on Nov 26^th, 2011, 2:04am

There are several new inductive-peaking techniques for bandwidth enhancement of low-voltage CMOS current amplifiers. The techniques improve the bandwidth by utilizing the resonance characteristics of LC network by employing bond wire capacitance or on-chip spiral inductors. Both series-peaking and shunt-peaking techniques are considered.

Title: Re: Inductive Peaking
Post by raja.cedt on Nov 26^th, 2011, 10:06am

hello Harry poll,
i am more intersted to learn new techniques, i know seris, shunt and bridge T..any new thing apart from there? and what do you mean by current amplifiers?

Thanks,
raj.