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Hi guys
I'm now designing a on-chip balun. two methods may be adopted.
First, get sp. file from momentum simulation,and use this sp.file to embedded in the rest of circuit do the full simulation such as dc ac noise tran pss ect.
Second, to model RLCK use it to simulate instead balun.
what...
Mixer or not
Can anybody design a 3.5G Mixer with 15dBm iip3,16dB Conversion gain? Can it be implemented in 0.13um CMOS 2.5V supply voltage?
Any tips will be welcome!
As the subject point out, How to simulate the NF of multiports of block? when simulate the NF need first define a input port/voltage/current as noise source,then you get the deteriorateion of SNR for the block.that's ok for differential input block.but how to get for a four phase input such...
thankyou!
I guess there maybe some optimum value for IIP3-NF under certain current .
Is it possible to achieve iip3 around 10dBm NF<15dB current tail<1mA 2G downconverting to 10MHz using .35 process?
Re: changed or unchanged
thanks to safwatonline: it is passive load just resistor I adopt the conventional gilbert cell .the current/size unchanged leads to NF changed. surprising or not!
Re: changed or unchanged
yes, thanks , indeed the joined one get better noise figure :D,why? Can you expain? two legs get equal current before and after the change, the transistors size remain also ,which affect the noise figure?
Dear gays:
It’s weird thing happened when I simulate the NF of mixer. I changed the tail current MOSFET: one symbol split into two W/L remain the same but the results tell different. Can you tell me why? thank you in advance!
I also post it on the analog design section.maybe here more attention!
what's the popular image rejection topology for integrated circuit?passive RC, active gm-C filter, weaver, or hartely,the merit and the demerit? thankyou for attention!
Hi: what's the popular image rejection topology for integrated circuit?passive RC, active gm-C filter, weaver, or hartely,the merit and the demerit? thankyou for attention!
Does high value poly resistor(large sheet resistor rph) process vary quite large than the small sheet poly(rnp)?I searched the PDK and did not find it,can anyone give me some explanation or reference?
Now I design an image rejection mixer, conventional Gilbert cell mixer +poly phase filter the simulation results : conversion gain 6.4 dB, ip3 8.49dBm, ports to ports isolation is bigger than 40dB and the image rejection ratio is bigger than 50dB@all corner the power consumption 1.4mA*3.3V all...
thankyou for attention!
the picture of the right is indeed the model description @ certain DC environment and the picture of the left is DC sweep of gm ,in my opinion, we can read the plot @ the same DC environment the same value as the model description ,but the reslut tell us not, i really...
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