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.

[SOLVED] How to convert double ended output to single ended output in Fully differential opamp

Status
Not open for further replies.

Munaaf.M.A

Newbie level 1
Joined
Apr 3, 2015
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
11
I need to convert double end of Fully differential opamp to single ended as i need only one output pin in order to design a filter. I have used VCVS but that is not a correct procedure as we dont get layout of VCVS. so i need suggestions for the above question. Thanking You. Waiting for a quick response. in CADENCE virtuoso environment
 
Last edited by a moderator:

FvM

Super Moderator
Staff member
Joined
Jan 22, 2008
Messages
48,933
Helped
14,337
Reputation
28,938
Reaction score
13,084
Trophy points
1,393
Location
Bochum, Germany
Activity points
282,340
There's nothing against using the output of a fully differential OP only single ended. What's your exact problem?
 

amaximus

Newbie level 4
Joined
Aug 28, 2007
Messages
5
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,283
Activity points
1,326
I am going to echo what FvM said above. You can just grab one of the outputs of the differential opamp and tie it to your next stage. You will lose half of the effective differential gain that way.

On the other hand, you can modify the differential opamp to have current mirror load to simply convert it to a single-ended output. You would retain the full gain that way.
 

crutschow

Advanced Member level 5
Joined
Feb 22, 2012
Messages
3,930
Helped
930
Reputation
1,858
Reaction score
931
Trophy points
1,393
Location
Colorado USA Zulu -7
Activity points
22,230
Here's the current-mirror differential to single-ended circuit that amasimus mentioned.
The current-mirror has the advantage of higher gain and it maintains the common-mode rejection of the differential amp, which pulling the signal from one transistor does not.
 

Osman Ceylan

Junior Member level 1
Joined
Mar 26, 2015
Messages
19
Helped
5
Reputation
10
Reaction score
5
Trophy points
3
Activity points
129
Use a Balanced-to-unbalanced conveter. shortly BalUn. 1:1 transformer is also very OK.
 

Eslam Saad

Newbie level 3
Joined
Apr 14, 2015
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
20
with current mirror technique
feed the current of one o/p to another by mirroring it
Screenshot-4.png
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top