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.

[SOLVED] Hysteresis Comparator .TRAN and .DC simulations results not exactly equal? why?

Status
Not open for further replies.

allennlowaton

Full Member level 5
Joined
Oct 5, 2009
Messages
247
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,298
Location
Taiwan
Activity points
3,044
Good day guys.
I made a simulations (.TRAN and .DC) of the hysteresis comparator.
The results are shown below:

Transient: (VHL-VLH) = 283mV
DC : (VHL-VLH) = 250mV



The question now, what happened to the 33mV? Where it come from?

Any idea please. Thank you
 

LvW

Advanced Member level 5
Joined
May 7, 2008
Messages
5,864
Helped
1,749
Reputation
3,504
Reaction score
1,353
Trophy points
1,393
Location
Germany
Activity points
39,824
Try another speed of the triangle during transient simulation - and you will most probably see a voltage difference even other than 283 mV. The reason is that during Tran analysis all time dependent elements (in particular: capacitances) are considered - opposite to the dc analysis. Thus, all delay effects of the realistic amplifier model influence the comparator response.
 

allennlowaton

Full Member level 5
Joined
Oct 5, 2009
Messages
247
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,298
Location
Taiwan
Activity points
3,044
I tried to simulate with a faster triangular wave and indeed, it produces a wider hysteresis value. Thank you LvW...
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top