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參數資料
| 型號： | SA1630 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | IF Quadrature Transceiver(IF正交收發(fā)器) |
| 中文描述： | 中頻正交收發(fā)器（中頻正交收發(fā)器） |
| 文件頁數： | 22/36頁 |
| 文件大?。?/td> | 477K |
| 代理商： | SA1630 |
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Philips Semiconductors
Application note
AN2003
SA1630 IF transceiver demonstration board
1999 Jan 05
22
QUANTITATIVE ANALYSIS RELATING I/Q MODULATION ERROR SOURCES TO CARRIER AND
SIDEBAND SUPPRESSION PERFORMANCE SPECIFICATIONS
I/Q modulation description: What is I and Q;
why do we use it, and how do we create it
When a low frequency baseband signal containing the information to
be sent through the communication channel is upconverted to a
higher frequency carrier signal by mixing it with a local oscillator
signal at the carrier frequency, the resulting output frequency
spectrum will contain spectral content at the carrier frequency and
two sidebands separated from the carrier by an offset equal to the
original baseband frequency.
The information in the original baseband signal is fully contained in
each of the sidebands. So the power and spectrum containing the
carrier and the opposite sideband is essentially wasted. I/Q
modulation is a method of creating the desired single sideband
suppressed carrier output.
The I/Q modulated transmit output signal is created by sending the
in-phase (I) baseband signal to a mixer to be multiplied by an
in-phase local oscillator. The quadrature (Q) baseband signal is sent
to another mixer to be multiplied by a quadrature local oscillator. The
transmit output signal is simply the summed outputs of these two
mixers. This is shown in Figure 23.
I CHANNEL GAIN = G G
e
90
°
I
o
+ I sin (
ω
bb
t)
sin (
ω
c
t)
Q
o
+ Q cos (
ω
bb
t)
Q CHANNEL GAIN = G
sin (
ω
c
t + P
e
)
cos (
ω
c
t)
Σ
TX OUTPUT
SR01887
Figure 23. showing a conceptual schematic of I/Q modulation circuitry
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PDF描述 |
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| SA1638 | Low voltage IF I/Q transceiver |
| SA2531B | VERSATILE SINGLE CHIP TELEPHONE WITH 14 NUMBER REPERTORY DIALLER |
| SA2531A | VERSATILE SINGLE CHIP TELEPHONE WITH 14 NUMBER REPERTORY DIALLER |
| SA2531C | VERSATILE SINGLE CHIP TELEPHONE WITH 14 NUMBER REPERTORY DIALLER |
| SA2531D | VERSATILE SINGLE CHIP TELEPHONE WITH 14 NUMBER REPERTORY DIALLER |
相關代理商/技術參數 |
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| SA1630BE | 制造商:NXP Semiconductors 功能描述: |
| SA1638 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low voltage IF I/Q transceiver |
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