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My design uses efuse and I need some help from you masters:
My understanding is that efuse can be blown out if a large current spike passes through it (document said 10mA for 1ms). I'm wondering if it can still be blown out if a slightly lower current is passed through for a longer period? like...
Hi guys,
I'm confused between two vias: nw-to-M1 and rx-to-M1. I figured the first one is from nwell to M1 and the second is from active layer to M1. Looking at two vias in the layout, the only difference is that nw-to-M1 has an extra surrounding nwell compared with rx-to-M1. So if I put...
Hello there,
We are trying to build up a testing environment for a commercial wifi mini-card. The card is simply reading a continuous modulated RF waveform through a wire connected between signal generator and its antenna socket. We are trying to see the received signal after down-conversion at...
I'm talking about the entire receiver's noise figure. Other parameters are pretty close to conventional RF-front ends, you can check out this one: "a 40nm CMOS 0.4-6GHz Receiver Resilient to out-of-band blockers" by Jan Craninckx.
Hi, since your frequency is low, a .18 technology should be able to provide the bandwidth you need. I think your biggest problem is the output swing or dynamic range. If the output for a 1uV input is 1V, what do you expect for a 1mV input? And you don't need to amplify your signal really too...
Hi, I've been looking into software defined radio(SDR) recently which I believe is something quite close to cognitive radio in terms of hardware requirements. For the receiver side, usually people can do 4 to 5 db dsb noise figure, but the biggest challenge is the linearity where out band...
Thanks for the reply, mtwieg.
Let's say take the noise from a 50ohm source as input and this I+jQ as the output, what would you suggest to characterize its noise performance? And how do you measure it?
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Thanks for the reply, darktrax.
I am confused how do you combine I and Q...
Hi, everyone.
Recently I've been reading this paper where the receiver has two differential output for I and Q channel respectively. The analysis simply assumes an output of I+jQ, but this is a complex signal. How do you measure the noise figure? Is there any instrument for analyzing complex...
Hello, everyone.
While doing noise matching for LNA, suppose Zopt = Gopt + j*Bopt. If Gopt shall be 1/Rs, then what about Bopt? Should it zero? Or does it affect if it's not?
Thanks
Hi everyone, I know this could be a really fundamental problem...
Is there any way (or has there been any trials in history..) to characterize signals with features other than frequency?
I was starting to learn CDMA recently and got in touch with this spectrum spreading technique. If my...
Hi, everyone!
As input power get larger, amplifier's gain would decrease due to nonlinearity.
More specifically, it's because the third order coeff in Tylor Expansion is negative.
Now here comes my question, is there any dvice or circuit that has positive third order coeff?:?:
Thus they could...
Greetings, everyone!
I'm currently trying to design a X band mw DRO
When talking about the S-param approach to designing osc, most of the texts I ran into gimme sth like this:
What if I want to design a parallel feedback DRO like this:
Will the theory in pic1 be applicable to this?:-(
If...
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