RF2461PCBA-41X 查看數據表（PDF） - RF Micro Devices
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RF2461PCBA-41X Datasheet PDF : 14 Pages
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RF2461
Application Schematic
NOTE:
Microstrip Inductor, Z0 = 50 Ω, L = 102 mils
suggested compared values.
LO IN
ENABLE
IP SET
IF SEL
LNA GAIN
MIX GAIN
LNA IN
VCC1
1
See Note 11
4.3 nH
2
33 nF
16 nH See Note 12
3
100 pF
See Note 8
4
50 Ω μstrip
5
L=130 mils
W=12 mils
Z0=50 Ω
See Note 2
56 Ω
See
Note 7
100 pF
See
Note 8
L2
100 pF
See
Note 8
C2
L
20
19
18
17
16
15
14
13
12
11
6
7
8
9
10
L1
R
C1
C1
BYPASS
100 pF
See
Note 8
C1
L1
R
0.1 μF
VCC1
See Note 8
51 Ω*
*This resistor improves NF and IIP3 for
VCC = 3.0 V.
100 pF
See
Note 9
7.5 nH
4 pF
See Note 11
620 Ω
See
Note 10
50 Ω μstrip
22 kΩ
See
Note 4
47 kΩ
See
Note 5
3.3 nH
See
Note 3
33 nF
See
Note 1
47 nH
See
Note 6
L
C2
L2
F
i
l
1t00 pF
eSee
Nr ote 8
F
NOTES:
i
1. DC blocking capacitor.
l
2. LNA emitter degenerator. As the vatlue of inductance is increased, the gain will decrease, and the IIP3 will increase.
3. Mixer preamp degeneration inductoer. As the value of inductance is increased, the gain will decrease, and the IIP3 will increase.
4. An external resistor connected to thris pin sets the current of the preamp and the mixer. Higher resistance to ground results in lower current. See chart at end of datasheet.
5. An external resistor connected to this pin sets the current of the LNA when IPSET is high. Higher resistance to ground results in lower current. See chart at end of datasheet.
6. Mixer input matching inductor.
7. LO input matching resistor.
8. Bypass capacitor.
9. LNA output matching and bias choke.
10. For stability of the LNA.
11. LNA input and output matching.
12. Low pass path to ground for two-tone beat frequency for optimum IIP3 of LNA.
F
i
l
t
e
r
C1
Output Interface Network
VCC2
VCC1
IF2+
IF2-
IF+
IF-
VCC1
Rev B6 DS060925
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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