pforpashya
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W=20um and L=60nm @ 60Ghz ?? It will never work due to high intrinsic capacitances @ 60GHz.
I guess you did increased too much the W to get the right bias current and you arrived W=20um.. Right ??
Vt is very important parameter for MOS transistor.It's threshold voltage for Vgs and it contributes into Ids directly. Therefore check this parameter from your sources and apply it correctly otherwise you will find 20um/60nm absurd values for 60GHz.
MOSFET2 is in near triode region.
Increase Vdd.
Vds(MOSFET1)=1.2-0.45=0.75
Vds(MOSFET2)=0.45-0.013=
Also try to increase Vg of MOSFET1.yeah thanks. I will increase it to 1.5V and see what happens...
Also try to increase Vg of MOSFET1.
Show me characteristics of single MOSFET.
W=20um, L=60nm, Ids=4mA, Vds=0.4V.
https://www.edaboard.com/threads/356804/
https://www.designers-guide.org/Forum/YaBB.pl?num=1273409182/11#11
https://www.designers-guide.org/Forum/YaBB.pl?num=1240322183/23#23
https://www.designers-guide.org/Forum/YaBB.pl?num=1240322183/20#20
https://www.designers-guide.org/Forum/YaBB.pl?num=1240322183/26#26
Is there any improvement regarding NF and Gain ?pforpashya said:Now I have changed VDD to 1.5V
but due to this 450mv has become 609mV
I think early voltage Va is relative low.pforpashya said:MOSFET 1 VG is still 1.0V
so MOSFET 1 Vgs becomes 1-0.609=0.4
as vt0 is 0.4 vt will be greater than 0.4 right?
No.I am attaching dc-analysis image
No.
Single MOSFET Characteristics.
Vds-ID, S21, NF, ft, Gmax, etc.
Your configuration is cascode with diode connected MOSFET.
No.can I send you a friend request?
I don't think so.one last question is width of MOSFET is higher i.e. 20um at 60ghz?
No.pforpashya said:ok. I think I have made mistake in DC analysis
I have to set q bias point for both MOSFET 1 and MOSFET 2 separately right?
No.
I don't think so.
http://www.jatit.org/volumes/Vol77No3/7Vol77No3.pdf
http://www-g.eng.cam.ac.uk/mentor/cmos-60G/Design of CMOS for 60GHz applications.pdf
I recommend to connect Vg of MOSFET1 to Vdd.
No.
You use same MOSFET for MOSFET1 and MOSFET2.
The following might be useful for you.
**broken link removed**
Apart from optimization of Bias and MOSFET sizes,thanks for the links really appreciate it as I am new to this domain and also to ADS
Apart from optimization of Bias and MOSFET sizes,
your schematic is very far from practical 60GHz Amplifier.
https://www.keysight.com/upload/cmc_upload/All/Webinar_60-GHz_RDK_Agilent-TSMC_03May2012_final.pdf
You don't have to set same bias for Mos1 and Mos2 at all.Now I have increased VDD to 1.8V
this is VG of MOSFET 1
Voltage between MOSFET 1 and MOSFET 2 is 1.08 so Vgs of MOSFET 1 is 0.72v
which is approx. same as VGs of MOSFET 2
Surely see all links in https://www.edaboard.com/threads/364282/#5pforpashya said:sorry to bother you,
But can plz tell me how to get various parameters as gm, ro ,noise figure in ADS
AC magnitude of VAC.pforpashya said:I am able to calculate gm vth vdsat and also various parameter
now I want to find cgs for that I am referring to your post
https://www.edaboard.com/threads/165432/#2
What is AC_vgs=1 here?
ok I will make threadsSurely see all links in https://www.edaboard.com/threads/364282/#5
AC magnitude of VAC.
thanks for reply
Don't send me questions.
Post as threads.
Do you think who can understand your situation with your above description ?As I try to change the VAC of AC source it gives me error
Do you think who can understand your situation with your above description ?
Study and consider how to describe sentences.
Show us ADS Netlist or Schematic.I tried to take VAC source from sources frequency domain and placed it in series with DC VGS. Then I tried to change value of this AC source to AC_vgs=1 but it gives me error
am I doing correctly?
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