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Fundamentals of Digital Quadra...

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数字正交调制基础mixed signal

Fundamentals of Digital Quadrature Modulation
How a formerly analog-only application, the quadrature modulator, is finding a home in modern digital CMOS fabrication techniques
By Ken Gentile

denoted by the symbol fc (or ωc for radian frequency) throughout this text. Typically, fc is much higher in frequency than the highest frequency component of the message signal.

The Basics
The concept of modulation comes from the trigonometric identity: cos (x )cos (y) = 1 1 cos (x + y) + (x y) 2 2

T

he concept of modulation is not at all new, it has been around since the early days of radio. Modulation, especially in the context of RF applications, refers to the mixing of two sinusoidal signals. One signal is the message signal and contains the information to be modulated. It usuall
标签:数字正交调制基础
Fundamentals of Digital Quadra...
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