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参数资料
| 型号： | AD8347ARUZ-REEL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 调制器/解调器 |
| 英文描述： | 800 MHz - 2700 MHz RF/MICROWAVE QUADRAPHASE DEMODULATOR |
| 封装： | MO-153AE, RU-28, TSSOP-28 |
| 文件页数： | 15/28页 |
| 文件大小： | 623K |
| 代理商： | AD8347ARUZ-REEL7 |
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AD8347
Rev. A | Page 22 of 28
FREQUENCY (MHz)
0
1
100
10
GROUP
DELAY
(
n
s)
5
10
15
20
25
30
35
40
45
50
02675-052
DC OFFSET COMPENSATION
Feedthrough of the LO signal to the RF input port results in
self-mixing of the LO signal. This produces a dc component at
the mixer output that is frequency dependent.
The AD8347 includes an internal circuit that actively nulls any
dc offsets that appear at the mixer output. The dc bias level of
the mixer output (which should ideally equal VVREF, the bias
level for the baseband sections of the chip) is continually com-
pared to VVREF. Any differences between the mixer output level
and VVREF forces a compensating voltage on to the mixer output.
The time constant of this correction loop is set by the capacitors
that are connected to Pin IOFS and Pin QOFS (each output can
be separately compensated). For normal operation, 0.1 μF
capacitors are recommended. The corner frequency of the
compensation loop is given approximately by
Figure 52. Group Delay of 20 MHz Baseband Low-Pass Filter
If the VGA is operating in AGC mode, the detector inputs
(VDT1 and VDT2) can be tied either to the inputs or outputs of
the filter. Connecting the detector inputs to the inputs of the
filter (IMXO and QMXO) causes the VGA leveling point to be
determined by the composite of the wanted signal and any
unfiltered components, such as blockers or signal harmonics.
Alternatively, connecting VDT1 and VDT2 to the outputs of the
filters ensures that the leveling point of the AGC circuit is based
upon the amplitude of the filtered output only. The latter option
is more desirable as it results in a more constant baseband
output. However, when using this method, set the leveling point
of the AGC so that the out-of-band blockers do not overdrive
the mixer output.
()
μF
in
40
3
OFS
dB
C
f
=
The corner frequency must be set to a frequency that is much
lower than the symbol rate of the demodulated data. This
prevents the compensation loop from falsely interpreting the
data stream as a changing offset voltage.
To disable the offset compensation circuits, tie IOFS and QOFS
to VREF.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8347-EVAL | 制造商:Analog Devices 功能描述:EVALUATION BOARD ((NS)) |
| ad8347-evalz | 制造商:Analog Devices 功能描述:EVAL BD 0.8 GHZ TO 2.7 GHZ DIRECT CONVERSION QUADRATURE DEMO - Bulk |
| AD8348 | 制造商:AD 制造商全称:Analog Devices 功能描述:400 MHz to 6 GHz Broadband Quadrature Modulator |
| AD8348ARE | 制造商:Analog Devices 功能描述:QUADRATURE MODULATOR - Rail/Tube |
| AD8348ARU | 功能描述:IC QUADRATUR DEMOD 50MHZ 28TSSOP RoHS:否 类别:RF/IF 和 RFID >> RF 解调器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:解调器 LO 频率:- RF 频率:70MHz ~ 300MHz P1dB:-9dBm 增益:- 噪音数据:6.36dB 电流 - 电源:41.5mA 电源电压:2.7 V 封装/外壳:28-WFQFN 裸露焊盘 供应商设备封装:28-TQFN-EP（5x5） 包装:带卷 (TR) |
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