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

The pros and cons of CMOS LNA by Razavi

Status
Not open for further replies.
P

Puppet1

Advanced Member level 2
Joined
May 7, 2004
Messages
689
Helped
11
Reputation
22
Reaction score
9
Trophy points
1,298
Activity points
6,074
CMOS LNA by Razavi

Hello

I am reading Behzad Razavi's paper on "CMOS RF Receiver Design for Wireless LAN Application" I think from 1999's IEEE CICC.

He has an cascode LNA in CMOS, degenerated with an inductor and has an LC tank. Above the tank he has a diode connected NMOS acting as a bias I assume (I am not sure please clarify).

In another earlier paper of his, in 1997 (Symposium on VLSI Circuits) he biased the LNA with a resistor conencted to a diode connected transistor and a current source at the gate.

What are the advantages and disadvantages of the two schemes ?

I have never seen a CMOS LNA biased with diode connected NMOS before.

Thanks
 

CMOS LNA by Razavi

Hi,Puppet1,Can you upload the schematic first?
 

CMOS LNA by Razavi

does it use for voltage level shifting
 

Re: CMOS LNA by Razavi

here it the circuit

look at M3, what is it's purpose ?
 

Re: CMOS LNA by Razavi

It provides with the correct common mode voltage to the mixer input.

nathan
 

Re: CMOS LNA by Razavi

and what would that voltage be relative to VDD ?

And is it be using as a bias for the LNA too ?
 

CMOS LNA by Razavi

find more info :

h**p://www.ee.ucla.edu/faculty/bios/razavi.htm
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top