The previous topic we have discussed about dialogic is on the issue of said no, in this case, we are
willing to discuss about the IQ mismatch or IQ imbalance.
So this is the architecture of an old and see what what we have seen earlier.
So in this case, we can see that there is the single local Hostetter and there is Mixu operations performed.
So what happened to the 90 degree fish is not ideal as it is an analog component.
So if you want to see exactly 90 degree first, so it is practically very difficult to achieve.
Moreover, there are two mixer's had used.
Normally they are very much matched pair of Mixu with converting the same input signal to the A version
of a low support.
This is all over due to the 90 degree phase shift.
It's a positive sign or it might become cosine.
So I believe what this is this architecture is doing.
It is using a Maspero mixer to convert the same input signal with a dual version of the local oscillator.
So what happened in the first shift is not ideal, dealable with a mismatch between the two local oscillator
signals, or there may be a mismatch between these two parts of the convergent mixtures.
So what happened?
This will cause the signal to be corrected either in the amplitude or the first phase difference.
So we have it here, the identical component.
So what happened?
We will we will not able to achieve a perfect integrated efface between them.
So due to this process there, there may be a phase and again, error in this report and there may be
a phase and then error in the viewport.
So due to this phase and again, error there is an image component is present at the output.
Suppose this what this is our actual signal.
What we want to transmit or receive, so this is my frequency and this is actually what we want to transmit,
are we going to see what what happen when we see the signal due to the fees and at what we are going
to receive or what we will transmit?
We have an image of this signal.
It might be very small in terms of amplitude, but there will be an image of this signal.
So due to this image, we have to, again, use a very short filter and all those things.
And this is a decision, again, a problem of modern architecture.
So let's see how it is seen.
So what we understand this in the case of a model, mostly like imbalance occurred due to a mismatch
between the left section of the receiver chain dealing with the interface.
And for the first signal part, that is the iPod and the.
But so what happened in the case of the architecture, we have already seen that for the first half
of what.
So what will be the local government with the other frequency?
Suppose this is two gigahertz.
We have selected it.
So what will be our of frequency?
That is two gigahertz.
So this will be our RF frequency that is two years hence this is our other frequency or two gigahertz.
So in this case of old architectures that we brought on the spectrum analyzer, we are not seeing any
major component because.
We are using a single local oscillator.
So what happened to this local oscillator that emits component will be inside this actual signal and
the DC component, what will we in this image of this signal?
So practically speaking, we cannot visualize in the case of a modern architecture the image and the
DC component, then what is the solution of visualizing this in?
This one is suppose.
In the case of a architecture we have we are using are to look at oscillators, so we have a laboratory
to choose the frequency and we can solve the problem of this upset, as we have seen earlier, what
we do in the basement section of a modern architecture, the provider digitalise in the case of a train,
we are using a higher frequency using a local oscillator one.
But in the case of a modern architecture, we provide that digitally.
So in the basement, suppose this is my signal in the basement.
What I am going to do, I am going to do a shift of one megahertz, two megahertz or even five megahertz
depending on my requirement.
So after doing a baseband shift in the basement in the digital domain itself.
So this is zero to my signal will be something like this.
And for this distance will be this is called F F or that.
And this is called intermediate frequency.
Or we can say this is if they have this term, I have some.
So now my actual signal is here.
So when I am going to transmit the signal, what happens?
So this is a direct conversion architecture.
It is a zero and I am going to transmit it as low watt.
So what how it will see.
Will we see something like this?
This is my one little Milovan and my in the voice of the signal one plus this is five.
So this is my dad, this is my actual signal.
This is Apollo one.
Plus this will we may have a if so what will we ever forever if I have here is.
F F plus F 11, so due to this shift, what we have seen, as we have seen earlier, that it is component
will be inside this one and that the second point will be inside this one.
But due to the shift, we will see a DC component here and we will also see a huge component of this
signal.
So this is my desired signal and this is my email signal.
So using a very simple and simple and small trick of such kind, we can visualize the image and the
DC component of modern architecture.
Such methodologies is often used to deploy the system to check for the performance of my system.
Moreover, sometime it may happen that we can solve this problem by some visible technique.
Either we use in the DSP, we can apply some technique to the issue of sectarian violence, but how
to become sure that my of offset or I can balance is minimized.
So this is one way to visualize on a visit so that can be verified.
So in this topic, we have learned about the IQ mismatch or IQ imbalance, and next we are going to
learn the brain architecture advantages and disadvantages.