Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Questions about RFIC design using LC folded inductor source

Status
Not open for further replies.
E

electronics_sky

Member level 3
Joined
Feb 9, 2006
Messages
64
Helped
3
Reputation
6
Reaction score
2
Trophy points
1,288
Activity points
1,827
Help for my design

Hi there,

I am currently designing a LNA by using Si with 0.18um technology. My target is to design an LNA that has NF < 2db, Gain =15db and OIP3 >-3, I<4mA.

I am using a LC folded inductor source degeneration topology. Below are some of my questions:

1. Does folded technique will provide better noise performance than cascode technique?

2. I get a gain of -50dB for my design(i know it is wrong...), could i know what went wrong with my circuit?

3. Any idea how to improve NF of LNA?

4. Does adding a capacitor at Gate-Source terminal at first stage NMOS will help to reduce the NF (especially gate induced noise)?


Thank you in advance.
 

Help for my design

What do NF and OIP mean?

Added after 1 minutes:

Can you provide your topology and some schematic?
 

Re: Help for my design

xjxmn said:
What do NF and OIP mean?

Added after 1 minutes:

Can you provide your topology and some schematic?
Click to expand...

NF is noise figure. OIP3 is third order output intercept point.
 

Re: Help for my design

you should check the rfic.com tutorials for lna.
in that they give some ex.
 

Help for my design

some microwave knowledge is neccessary.
for example,adding a capacitor at Gate-Source terminal at first stage NMOS will change the match. then the NF.
 

Help for my design

What!s your power supply?
maybe, this will be limit the usage of the cascode structure..
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top