RF3806 查看數據表（PDF） - RF Micro Devices
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RF3806 Datasheet PDF : 18 Pages
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RF3806
3
Evaluation Board Schematic - UMTS2100
VREF
J1
RF IN
R10
0Ω
C33 + C34
0.1 μF 10 μF
C35
10 pF
C38
10 pF
C39
C41 + C40
1000 pF 0.1 μF 10 μF
R4
270 Ω
R5
270 Ω
R7
270 Ω
R8
270 Ω
L4
24 nH
C27
1000 pF
1
50 Ω μstrip
C28
2
9.1 pF
3
C18
C19
C20
C30
Open
Open
2.0 pF
9.1 pF
4
Bias
Circuit
VBIAS
C43
10 pF
C46
C44
0.1 μF 1000 pF
C45 +
10 μF
C48
C49
10 pF 1000 pF
C51
0.1 μF
C50 +
10 μF
VCC
C5
1000 pF
C11
0.1 μF
C7
10 pF
C6 +
10 μF
8
L2
7
24 nH
C14
9.1 pF 50 Ω μstrip
J2
6
C29
C12
C26
C13
C15
C8
L9
C10
C16
RF OUT
3.3 pF
Open
Open 9.1 pF Open
Open 15 nH
Open
Open
5
This eval board for low power linear operation: 21dBm<POUT<27dBm, 5 V<VCC<8V. Bias R seen above for 8V and 60mA IREF.
See biasing table for setting resistance at other supply voltages.
RF3806 Biasing Table
The resistor values shown below are for varied VCC/ICQ conditions. Biasing for higher quiescent current will give increased lin-
earity. “R_Bias”=equivalent R in line with VREF (see values on evaluation board schematic: R4, R5, R7, R8).
Max allowable IREF=60mA.
VCC
VREF
VBIAS RBIAS (at VREF)
IREF
Typical ICQ
Volt
Volt
Volt
Ohm
mA
mA
8
8
8
7
7
7
62
60
730
45
60
726
6
6
6
28.5
60
718
5
5
5
11.5
60
707
8
8
8
80.5
50
676
7
7
7
60
50
670
6
6
6
40
50
663
5
5
5
20
50
649
8
8
8
105
41
623
7
7
7
80.5
41
614
6
6
6
56
41
601
5
5
5
31.5
41
584
In IREF=60mA case, calculated RBIAS was rounded up to nearest 0.5Ω.
This to keep IREF at or slightly below 60mA max.
3-118
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A3 DS070509
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