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.

3db Bandwidth of diff amp

Status
Not open for further replies.

anal0g

Newbie level 5
Joined
Aug 23, 2008
Messages
8
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,331
Can someone please help me in calculating the 3db bandwidth of this diff amp ?
I am attaching the schematic.
Thanks

[/img]
 

The nodes Vout have some capacitance. Let's call the total capacitance on each side (mostly due the the drain capacitance of the MOSFET's plus any load capacitance not shown in your circuit) as Co.

The 3-dB bandwidth is 1/(2*pi*R1*Co).
 

So R2 has no effect on the 3dB bandwidth ? I would imagine that it does ...
 

R2 has no effect if you are driving the circuit differentially and looking at the differential output. I presumed this was the case, since you have a tail current source that greatly suppresses any common-mode gain.

The common-mode bandwidth is

1/(2*pi*(R1+R2/2)*2*Co)
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top