The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> ring vco https://designers-guide.org/forum/YaBB.pl?num=1131974784 Message started by vijay on Nov 14th, 2005, 5:26am |
Title: ring vco Post by vijay on Nov 14th, 2005, 5:26am Hi, I have a symmetric load 4 stage ring vco for simulation.Initially I try to simulate it by giving constant bias volatages at the PMOS bias and NMOS bias voltages. I do a transient analysis for observing the oscillation.But instead the simulation shows the two voltages stuck up at high (3.814V and 3.125V) for a 0.6um process. pmos bias volatge is 0.5V and NMOS as 2.5V. Thanks in advance, V |
Title: Re: ring vco Post by Sezi on Nov 23rd, 2005, 10:02am The differential voltages, both of them stuck at high? Check your circuit maybe you have made some wrong connections.. |
Title: Re: ring vco Post by ywguo on Nov 23rd, 2005, 6:26pm Hi, Vijay, I think that stuck is due to wrong bias. Do you bias the PMOS and NMOS using voltage source? Please bias your ring VCO using a reference current, and generate the bias voltage for ring VCO using current mirror. :) Best regards, Yawei |
The Designer's Guide Community Forum » Powered by YaBB 2.2.2! YaBB © 2000-2008. All Rights Reserved. |