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參數(shù)資料
| 型號(hào)： | LT5516 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 800MHz to 1.5GHz Direct Conversion Quadrature Demodulator |
| 中文描述： | 800MHz至1.5GHz的直接轉(zhuǎn)換正交解調(diào)器 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 209K |
| 代理商： | LT5516 |
LT5516
9
5516f
The LT5516 is a direct I/Q demodulator targeting high
linearity receiver applications, including wireless infra-
structure. It consists of an RF amplifier, I/Q mixers, a
quadrature LO carrier generator and bias circuitry.
The RF signal is applied to the inputs of the RF amplifier
and is then demodulated into I/Q baseband signals using
quadrature LO signals. The quadrature LO signals are
internally generated by precision 90
°
phase shifters. The
demodulated I/Q signals are lowpass filtered internally
with a –3dB bandwidth of 265MHz. The differential out-
puts of the I-channel and Q-channel are well matched in
amplitude; their phases are 90
°
apart.
RF Input Port
Differential drive is highly recommended for the RF inputs
to minimize the LO feedthrough to the RF port and to
maximize gain. (See Figure 2.) A 1:4 transformer is used
on the demonstration board for wider bandwidth match-
ing. To assure good NF and maximize the demodulator
gain, a low loss transformer is employed. Shunt inductor
L1, with high resonance frequency, is required for proper
impedance matching. Single-ended to differential conver-
sion can also be implemented using narrow band, discrete
L-C circuits to produce the required balanced waveforms
at the RF
+
and RF
–
inputs.The differential impedance of
the RF inputs is listed in Table 1.
Table 1. RF Input Differential Impedance
FREQUENCY
DIFFERENTIAL INPUT
(MHz)
IMPEDANCE (
)
800
258.7-j195.2
900
239.9-j181.8
1000
224.1-j170.0
1100
210.9-j160.0
1200
200.7-j152.1
1300
191.4-j144.7
1400
183.2-j138.3
1500
176.5-j133.1
DIFFERENTIAL S11
MAG
0.779
0.766
0.753
0.740
0.729
0.718
0.707
0.698
ANGLE ()
–16.9
–18.3
–19.6
–20.9
–21.9
–23.0
–24.0
–24.9
The RF
+
and RF
–
inputs (Pins 2, 3) are internally biased at
2.44V. These two pins should be DC blocked when con-
nected to ground or other matching components. The RF
input equivalent circuit is shown in Figure 5.
APPLICATIU
W
U
U
An external resistor (R1) is connected to Pin 6 (V
CM
) to set
the optimum DC current for I/Q mixer linearity. The IIP3 can
be improved with a smaller R1 at a price of slightly higher
NF and I
CC
. The RF performances of NF, IIP3 and IIP2 vs
R1 are shown in the Typical Performance Characteristics.
LO Input Port
The LO inputs (Pins 10,11) should be driven differentially
to minimize LO feedthrough to the RF port. This can be
accomplished by means of a single-ended to differential
conversion as shown in Figure 2. L4, the 27nH shunt
inductor, serves to tune out the capacitive component of
the LO differential input. The resonance frequency of the
inductor should be greater than the operating frequency.
A 1:4 transformer is used on the demo board to match the
200
on-chip resistance to a 50
source. Figure 6 shows
the LO input equivalent circuit and the associated match-
ing network.
Single-ended to differential conversion at the LO inputs
can also be implemented using a discrete L-C circuit to
produce a balanced waveform without a transformer.
An alternative solution is a simple single-ended termina-
tion. However, the LO feedthrough to RF may be degraded.
Either LO
+
or LO
–
input can be terminated to a 50
source
with a matching circuit, while the other input is connected
to ground through a 100pF bypass capacitor.
Table 2 shows the differential input impedance of the LO
input port.
Table 2. LO Input Differential Impedance
FREQUENCY
DIFFERENTIAL INPUT
(MHz)
IMPEDANCE (
)
800
134.7-j65.1
900
128.5-j66.7
1000
121.8-j67.5
1100
115.7-j67.2
1200
109.3-j66.1
1300
103.0-j64.4
1400
96.7-j62.1
1500
91.0-j59.4
DIFFERENTIAL S11
MAG
0.552
0.517
0.512
0.505
0.498
0.490
0.480
0.469
ANGLE ()
–22.5
–25.4
–28.5
–31.8
–35.0
–38.3
–42.0
–45.8
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| LT5516EUF | 功能描述:IC DEMODULATOR QUADRATURE 16-QFN RoHS:否 類別:RF/IF 和 RFID >> RF 解調(diào)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:解調(diào)器 LO 頻率:- RF 頻率:70MHz ~ 300MHz P1dB:-9dBm 增益:- 噪音數(shù)據(jù):6.36dB 電流 - 電源:41.5mA 電源電壓:2.7 V 封裝/外殼:28-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:28-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LT5516EUF#PBF | 功能描述:IC DEMODULATOR QUADRATURE 16-QFN RoHS:是 類別:RF/IF 和 RFID >> RF 解調(diào)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:解調(diào)器 LO 頻率:- RF 頻率:70MHz ~ 300MHz P1dB:-9dBm 增益:- 噪音數(shù)據(jù):6.36dB 電流 - 電源:41.5mA 電源電壓:2.7 V 封裝/外殼:28-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:28-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LT5516EUF#TR | 功能描述:IC DEMODULATOR QUADRATURE 16-QFN RoHS:否 類別:RF/IF 和 RFID >> RF 解調(diào)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:解調(diào)器 LO 頻率:- RF 頻率:70MHz ~ 300MHz P1dB:-9dBm 增益:- 噪音數(shù)據(jù):6.36dB 電流 - 電源:41.5mA 電源電壓:2.7 V 封裝/外殼:28-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:28-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LT5516EUF#TRPBF | 功能描述:IC DEMODULATOR QUADRATURE 16-QFN RoHS:是 類別:RF/IF 和 RFID >> RF 解調(diào)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:解調(diào)器 LO 頻率:- RF 頻率:70MHz ~ 300MHz P1dB:-9dBm 增益:- 噪音數(shù)據(jù):6.36dB 電流 - 電源:41.5mA 電源電壓:2.7 V 封裝/外殼:28-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:28-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LT5517 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator |
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