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May 4^th, 2024, 11:53am

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cmos down conversion mixer (Read 11580 times)

udaykumarchintala Junior Member Offline Posts: 22 ahmedabad	cmos down conversion mixer Feb 11^th, 2008, 10:06am hii. How to generate square wave of desired frequency in RF spectre for simulating the mixer????
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Ken Kundert Global Moderator Offline Posts: 2384 Silicon Valley	Re: cmos down conversion mixer Reply #1 - Feb 11^th, 2008, 5:10pm With a pulse source, just like you would in transient analysis. -Ken
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udaykumarchintala Junior Member Offline Posts: 22 ahmedabad	Re: cmos down conversion mixer Reply #2 - Feb 12^th, 2008, 9:25am hiii, By using a pulse source I am unable to generate the required frequencies ,it is asking for a particular time period..............
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didac Senior Member Offline There's a million ways to see the things in life Posts: 247 manresa,spain	Re: cmos down conversion mixer Reply #3 - Feb 12^th, 2008, 9:52am Hi, Time-frequency duality. f=1/period,period=1/f Hope it helps,
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udaykumarchintala Junior Member Offline Posts: 22 ahmedabad	Re: cmos down conversion mixer Reply #4 - Feb 14^th, 2008, 1:11am Hi, For example if I want to generate a 2.3 GHz LO square signal, can I generate it by giving a time period of .434 n sec for the pulse source????????Will it work?????
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Ken Kundert Global Moderator Offline Posts: 2384 Silicon Valley	Re: cmos down conversion mixer Reply #5 - Feb 14^th, 2008, 3:56pm Set the period to 1/2.3GHz. The width and levels of the pulses can be adjusted with other parameters. See "spectre -h vsource" for more information. -Ken
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udaykumarchintala Junior Member Offline Posts: 22 ahmedabad	Re: cmos down conversion mixer Reply #6 - Feb 26^th, 2008, 11:47am Hi..... How to calculate the extrapolation points while measuring the 1dB compression point and IIP3 for the mixer in spectre........ Thanks in advance.......
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udaykumarchintala Junior Member Offline Posts: 22 ahmedabad	Re: cmos down conversion mixer Reply #7 - Mar 3^rd, 2008, 9:24am hi, I have designed a mixer which has -1.477dBm 1dB compression point,but for the same I am unable to simulate the IIP3, RF frequncy is 2.4GHz and LO is 2.3GHz for this mixer...please help...... Thanks in advance uday
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udaykumarchintala Junior Member Offline Posts: 22 ahmedabad	Re: cmos down conversion mixer Reply #8 - Mar 3^rd, 2008, 12:15pm Hi, How to find out the LO-RF isolation in cadence spectre for a mixer? Thanks in advance....... uday
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udaykumarchintala

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Re: cmos down conversion mixer
Reply #9 - Mar 4^th, 2008, 11:06am

Hi,
I have designed a mixer with RF =2.4GHz,LO=2.3GHz as we know the IF is at 100MHz.I got 1 dB compression point of -1.47dBm for this,but I am unable to calculate IIP3 for this in the spectre,I have taken the interfer as 2.41GHz ,for this the third order interferers at the output will be at 140MHz and at 90 MHz,while simulating I am unable to give the arry of indices in the PAC analysis in spectre......help me....

Thanks in advance......

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khouly New Member Offline Posts: 5	Re: cmos down conversion mixer Reply #10 - Mar 24^th, 2008, 8:03am to get the feed through , just plot the spectrum of the node u want , and then find the component and calculate how much attenuation khouly
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udaykumarchintala Junior Member Offline Posts: 22 ahmedabad	Re: cmos down conversion mixer Reply #11 - Mar 25^th, 2008, 11:48pm Hi, expalin me a bit more......if i want to measure the feed through from LO-RF how should I do ?Should I use PSS analysis and plot spectrum at both LO and RF ports and to see the feed through????
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udaykumarchintala Junior Member Offline Posts: 22 ahmedabad	Re: cmos down conversion mixer Reply #12 - Apr 11^th, 2008, 11:43am hii, For my mixer I have plotted voltage gain by PSS analysis and conversion gain by PSS/PXF .I am not getting the same value.whay?what is the difference? Thanks
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pancho_hideboo

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Re: cmos down conversion mixer
Reply #13 - Apr 13^th, 2008, 8:06am

udaykumarchintala wrote on Apr 11^th, 2008, 11:43am:

� � For my mixer I have plotted voltage gain by PSS analysis and conversion gain by PSS/PXF.
I am not getting the same value.whay?what is the difference?

Maybe you are using "Direct Plot Menu" to plot Gain. Is this correct ?
Do you understand gain definitions of PSS, PAC, PXF and Pnoise in "Direct Plot Menu".
See the followings.
http://www.designers-guide.org/Forum/YaBB.pl?num=1122952471/5#5
http://www.edaboard.com/viewtopic.php?t=214650&highlight=

You should write down gain definitions for PSS and PXF in "Direct Plot Menu".
Especially you have to study denominator of gain each for PSS and PXF.

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