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.

harmoincs from an ideal sine-voltage source

Status
Not open for further replies.

engrMunna

Advanced Member level 4
Joined
Oct 25, 2010
Messages
106
Helped
6
Reputation
12
Reaction score
5
Trophy points
1,298
Activity points
2,071
Hi, I am simulating an op-amp i unitygain feedback...I want to check the SNR of the opamp. When I apply an ideal sine wave to the positive terminal and plot the power spectral density of the sine wave of this ideal source I see a lot of harmoincs. and of course these will be then visible at the output too. My question is that why is the ideal source showing so many harmoincs?
 

What kind of opamp are you using ? What about the level of the sinusoid in input ? Some opamp have diodes in anti-parallel between inverting and non-inverting inputs to protect the device. If the level is high enough to switch the diodes on, harmonics can be generated.
 

Its an integrated circuit design. I am using a folded cascode, and I use Cadence Spectre to do the trasient analysis.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top