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參數(shù)資料
| 型號： | LTC4403 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 40MHz to 900MHz Quadrature Demodulator |
| 中文描述： | 高達(dá)40MHz至900MHz正交解調(diào)器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 208K |
| 代理商： | LTC4403 |
LT5517
10
5517f
Figure 7. I/Q Output Equivalent Circuit
APPLICATIU
approach is to terminate each output with a shunt capaci-
tor. The capacitor value can be optimized depending upon
the operating frequency and the specific PCB layout.
The phase relationship between the I-channel output sig-
nal and the Q-channel output signal is fixed. When the LO
input frequency is higher than the RF input frequency, then
the Q-channel outputs (Q
OUT+
, Q
OUT–
) lead the I-channel
outputs (I
OUT+
, I
OUT–
) by 90
°
.
When the LO input frequency is lower than the RF input
frequency, then the Q-channel outputs lag the I-channel
outputs by 90
°
. Note that the phase relationship of the I-
and Q-channel outputs relative to the LO can vary by 180
°
,
depending on start-up conditions. This is the nature of a
frequency divider-based quadrature phase generator.
W
U
U
15
16
V
CC
10pF
I
OUT+
I
OUT–
5517 F07
13
14
10pF
Q
OUT+
Q
OUT–
60
60
60
60
When AC output coupling is used, the resulting highpass
filter’s –3dB roll-off frequency is defined by the R-C
constant of the blocking capacitor and R
LOAD
, assuming
R
LOAD
> 600
.
Care should be taken when the demodulator’s outputs are
DC coupled to the external load to make sure that the I/Q
mixers are biased properly. If the current drain from the
outputs exceeds 6mA, there can be significant degrada-
tion of the linearity performance. Each output can sink no
more than 13mA when connected to an external load with
a DC voltage higher than V
CC
– 0.78V.
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