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Thanks a lot. Your explain is more understandable than help file. And your mmatl.exe is more convenient than momentum itself.
In your mmatl_user_guide_v3.pdf, there is a Air dielectric layer that its thickness = 1000um, epsilon =1, Resistivity=INF Ohm*cm.
However, when exporting the .son file...
Thank you very much ~~~~~~~~~
About “PDK said : the dielectric layers outside the metal are overetched XXX um”， I think it means it is about the relation between the dielectric layers and the metal layers， because this sentence appears where the PDK describes the dielectric layers。
About the...
Hi,everyone. I am using momentum to design transformer. But two problem appears when I have define sub.
1、 how can I know the conductance of VIA.
Here is one segment of PDK parameter :
----------------------------------------------------------------
Film | Valid Width | Rsh...
According to the book “Design of Analog CMOS Integrated Circuits”（Razavi）, for a two port network, the internal noise can be presented by source of voltage in series with the input and a source of current in parallel with the input.
(1)When calculating the equivalent input noise voltage, we...
Friends, I am designing a GaAs LNA. Tech is WIN (Wireless Information Networking) 0.5um INGaAs pHEMT Enhancement/Depletion-Mode Device.
The LNA requires variable gain from 0dB~18dB, P1dBin >-10dBm@18dB, 0dBm@0dB. And working frequency between 400MHz---900MHz.
I tried many kinds of circuit, such...
Yes. This circuit has been used many decades ago.
I want to know how engineer build the bias circuit, because my circuit method introduces large noise.
Do you have any suggestion?
Commonly，a passive is composed of 4 swithc. See Fig1
https://obrazki.elektroda.pl/54_1284133830.jpg
And usually it needs two voltage bias: One is at gate VB_G and the other is at source (or drain),VB_D. See Fig2
https://obrazki.elektroda.pl/0_1284133830.jpg
Theoretically voltage bias of...
I have a question：
I upload a mixer tutorial.
The tutorial teaches me how to test IIP3 with the help of QPSS+QPAC.
As to the mixer example, variable frf=2.4GHz, and variable flo=2.4GHz. This means fif=0 Hz.
But when stimulating IIP3, frf is set to 2.401GHz, and in the QPAC panel, Sweep...
Hi，everyone!
I am designing a RF block.
But when doing match, i get in trouble.
I find a 50 Ohm balun dodoes not show 50 Ohm charactor.
Detail content is in the attached file.
Thank you for everyone' s help~
Actually， there is no exact performance. IIP3 should be larger than 10dBm, NF should be less than 10dB. CG should be larger than 10dB.
IIP3 is the most important performance, and i need wideband input. Also i need match input and output to 50 Ohm.
Added after 6 minutes:
hi, i have another...
Thankd for your reply. I will think about your advice carefully.
Added after 2 minutes:
Thinks for your reply. But i want to design a mixer chip by using MOS technique.
Do you have other good advice?
i am dedsigning a mixer for a Superheterodyn receiver .
The input signal is wideband from tens of MHz to tens of hundreds of MHZ(almost 1 GHz).
IF is about 300MHz。
The mixer needs high IIP3, and low NF.
The mixer need 50 Ohm input and output match. This is the biggest problem...
how can i do match input and output match for a resisitive mixer?
RF signal is a broadband signal
here is my circuit:
50 Ohm source---50 Ohm input match---mixer---50 Ohm output match---filter---50Ohm load
As the resistive mixer has only 4 mosfet which act as switch, the input impedance...
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