The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> AM modulation https://designers-guide.org/forum/YaBB.pl?num=1266499414 Message started by ic_engr on Feb 18th, 2010, 5:23am |
Title: AM modulation Post by ic_engr on Feb 18th, 2010, 5:23am Hello Folks, I would like to set-up 80% 1kHz AM modulation on a 900MHz RF signal. In Cadence what will be the easiest way to perform this set-up ?. I was thinking of two voltage sources (vsin) in series, a 1kHz sinewave and another 900MHz sinewave in series. I am not sure how I will have the 80% modulation specified ?. Any suggestions. ic_engr |
Title: Re: AM modulation Post by pancho_hideboo on Feb 18th, 2010, 5:33am I can't find out any design issue in your post. Your question is no more than easy usage of simulator. Please post to Simulator's board or read documents of your simulator. ic_engr wrote on Feb 18th, 2010, 5:23am:
Here "ammodindex ; AM modulation index" and "ammodfreq ; AM modulation freq" are available. See parameters of the followings. http://edocs.soco.agilent.com/display/ads2009/vsin http://edocs.soco.agilent.com/display/ads2009/vsource Again see http://www.designers-guide.org/Forum/YaBB.pl?num=1233850018 If you use Golden Standard simulator HSPICE, use "analogLib/vsin" not "analogLib/vsource". ic_engr wrote on Feb 18th, 2010, 5:23am:
If you would like to generate AM signal by synthesization of spectrum, connect three "vsin" in series. Here their frequencies are 900MHz, 900MHz-1kHz and 900MHz+1kHz. I assume amplitude of 900MHz component is "A". Amplitudes of both 900MHz-1kHz and 900MHz+1kHz have to be "0.8*A/2". BTW, have you been able to understand basic modulation including GMSK ? http://www.designers-guide.org/Forum/YaBB.pl?num=1263572424 The followings are general notes for you. - Always describe vendor's name which you use as tool or simulator. - Don't do multiple posts which are same content. - Don't request source code or behavioral model without any efforts. - There are many simulators which have analyses called as PSS, PAC and Pnoise. - Describe in detail with using correct terminologies. - Warnigns are different from Errors. - ADS is not name of simulator. - There is no tool which name is Cadence. - Don't use Direct Plot of Cadence ADE blindly without knowing definition. - All gains in Direct Plot of Cadence ADE are "right", "true" and "practical" voltage gain. - Don't mix up Simulation with Post Processing. They are completely different phase. - MATLAB are different from Simulink. - Learn measurements using actual instruments. Not "EDA Tool Play |
Title: Re: AM modulation Post by RFICDUDE on Feb 27th, 2010, 4:24am If you are trying to create AM double sideband then you will need three sinusoidal sources: one for each sideband and also the carrier. 100% modulation accurs when the amplitude of each sideband is 50% of the carrier amplitude. Ac=2*Asb x(t)=Ac*cos(wc*t)+Asb*cos[(wc-wsb)*t]+Asb*cos[(wc+wsb)*t] You can scale the sideband amplitude down reduce the % modulation. |
Title: Re: AM modulation Post by pancho_hideboo on Feb 27th, 2010, 4:32am RFICDUDE wrote on Feb 27th, 2010, 4:24am:
I've already described like following. pancho_hideboo wrote on Feb 18th, 2010, 5:33am:
|
Title: Re: AM modulation Post by RFICDUDE on Mar 1st, 2010, 4:41pm Ah, yes you did. I simply did not read your entire response. I apologize for the redundant response. RFICDUDE |
The Designer's Guide Community Forum » Powered by YaBB 2.2.2! YaBB © 2000-2008. All Rights Reserved. |