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Recent Entries

SAW-less Direct Conversion Receiver Consideration

by criterion456 on 26th October 2015 at 09:59


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

SAW-less Direct Conversion Receiver Consideration.rar

Updated 26th August 2017 at 08:34 by criterion456

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CDMA Zero-IF Receiver Consideration

by criterion456 on 17th October 2015 at 16:56


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
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Carrier leakage

by criterion456 on 14th October 2015 at 12:16
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 sideband(i.e. image),
and the other is carrier leakage(i.e. LO leakage).


Carrier

Read More

Updated 15th October 2015 at 03:33 by criterion456

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I/Q Imbalance

by criterion456 on 14th October 2015 at 06:46
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 .




The undesired sideband, so-called image, resulting from I/Q imbalance .
Especially, in the case of broadband operation,

Read More

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Introduction to IQ signal

by criterion456 on 14th October 2015 at 06:26
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 the final signal.
In other words, SSB provides a considerably more efficient form of communication when compared to DSB modulation.
It is far more efficient in terms of the

Read More

Updated 14th October 2015 at 07:59 by criterion456

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