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參數(shù)資料
| 型號(hào)： | LTC1757A |
| 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(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 208K |
| 代理商： | LTC1757A |
LT5517
9
5517f
Table 2. RF Input Differential Impedance
FREQUENCY
(MHz)
40
100
200
300
400
500
600
700
800
900
DIFFERENTIAL INPUT
IMPEDANCE (
)
240.1-j10.3
245.5-j25.9
236.8-j50.0
223.6-j70.5
207.9-j86.3
190.6-j98.1
173.2-j105.8
156.2-j110.2
141.2-j111.8
129.5-j114.5
DIFFERENTIAL S11
MAG
0.665
0.664
0.664
0.663
0.662
0.660
0.657
0.655
0.651
0.650
ANGLE(
°
)
–0.8
–2.5
–5.1
–7.6
–10.2
–12.7
–15.3
–17.9
–20.4
–22.9
2XLO Input Port
To ease the interface of the receiver with the external 2XLO
input, the 2XLO port is designed with on-chip 50
imped-
ance matching up to 2GHz. The input is internally biased
at 1V. A 1nF DC blocking capacitor is required when
connected to the external 2XLO source.
The 2XLO frequency is required to be twice the desired
operating frequency in order for the chip to generate the
APPLICATIU
W
U
U
quadrature Local Oscillator (LO) signals for the demodu-
lator. The on-chip divide-by-two circuit delivers well-
matched, quadrature LO carriers to the I mixer and the Q
mixer.
I-Channel and Q-Channel Outputs
Each of the I-channel and Q-channel outputs is internally
connected to V
CC
though a 60
resistor. The output DC
bias voltage is V
CC
– 0.78V. The outputs can be DC coupled
or AC coupled to the external loads. The differential output
impedance of the demodulator is 120
in parallel with a
10pF internal capacitor, forming a lowpass filter with a
–3dB corner frequency at 130MHz. The load impedance,
R
LOAD
, should be larger than 600
to assure full gain. The
gain is reduced by 20 log(1 + 120
/R
LOAD
) in dB when
the differential output is terminated by R
LOAD
. For ex-
ample, the gain is reduced by 6.85dB when each output pin
is connected to a 50
load (or 100
differential loads).
The output should be taken differentially (or by using
differential-to-single-ended conversion) for best RF per-
formance, including NF and IM2. Proper filtering of the
unwanted high frequency mixing product is also impor-
tant to maintain the highest linearity. A convenient
Figure 6. RF Input Equivalent Circuit with External Broadband Matching
3
2
V
CC
LT5517
RF
+
1
2
3
5
4
RF
–
5517 F06
250
2.30V
RF
J1
C10
3.3pF
C1
1nF
T1
MABAES0054
C2
1nF
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