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1. Why do we need external filter
2. Why do we wanna remove external filter
3. The risk of removing external filter
4. Blocker-Tolerant techniques
Please refer to
What is cross modulation ?
What is the difference between cross modulation and intermodulation ?
What is single tone desense ? Why do we have to the test ?
What is triple beat ?
Please refer to
For
I/Q signal
I/Q imbalance
carrier leakage
you can refer to the PDF file
Introduction to I/Q signal
As mentioned above, for SSB modulation, in reality, there will be at least three tones in the spectrum.
One is signal(i.e. desired sideband), another is undesired...
I/Q Imbalance
As mentioned above, for SSB modulation, there should be only one desired sideband in the spectrum in theory.
Nevertheless, in reality, there will be at least three tones in the spectrum.
As shown below, one of the three tones is undesired sideband, so-called image ...
Single Sideband Modulation
Conventional double sideband(DSB) modulation can be considered wasteful of power and bandwidth because they contain a carrier signal and two identical sidebands.
Conversely, single sideband(SSB) modulation, as the name implies, uses only one sideband to provide...
We can also analyze it in terms of E/H fields .
As illustrated above, both microstrip line and stripline radiate E-field outside.
Thus, we need ground plane to absorb their E fields.
And larger the ground plane,
lower the ground impedance, more the E-fields that ground plane...
According to my previous experience,
wideband matching from 700 MHz to 2700 MHz (GSM/WCDMA/LTE) can be achieved by mere 3 components.
If the frequency range is 2.4, 2.1, 1.8, 1.6, 0.9 GHz,
and you have 5 components,
just do the wideband matching from 0.9 GHz to 2.4 GHz
To start...
For a Direct-conversion(Zero-IF) receiver, RF signal down converts to BaseBand signal near 0 Hz directly.
Let’s assume there are 2 tones , f1 is interference, f2 is signal, and their frequency are close, i.e. f1 = f2.
If LNA IIP2 is not good enough, f1 and f2 will compose IMD2...
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