參數(shù)資料
型號: AD9786BSVRL
廠商: ANALOG DEVICES INC
元件分類: DAC
英文描述: 16-Bit, 200 MSPS/500 MSPS TxDAC+ with 2】/4】/8】 Interpolation and Signal Processing
中文描述: PARALLEL, WORD INPUT LOADING, 16-BIT DAC, PQFP80
封裝: PLASTIC, MS-026-ADD, TQFP-80
文件頁數(shù): 12/60頁
文件大小: 1497K
代理商: AD9786BSVRL
AD9786
Complex Modulation
Rev. 0 | Page 12 of 60
The process of passing the real and imaginary components of a
signal through a complex modulator (transfer function = e
jwt
=
coswt + jsinwt) and realizing real and imaginary components
on the modulator output.
Hilbert Transform
A function with unity gain over all frequencies, but with a phase
shift of 90 degrees for negative frequencies, and a phase shift of
–90 degrees for positive frequencies. Although this function can
not be implemented ideally, it can be approximated with a short
FIR filter with enough accuracy to be very useful in single
sideband radio architectures.
Complex Image Rejection
In a traditional two part upconversion, two images are created
around the second IF frequency. These images are redundant
and have the effect of wasting transmitter power and system
bandwidth. By placing the real part of a second complex
modulator in series with the first complex modulator, either the
upper or lower frequency image near the second IF can be
rejected.
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