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RF2461
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.
Application Schematic
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
20
19
18
17
16
VCC1
100 pF
33 nF
16 nH
4.3 nH
IF SEL
100 pF
56
Ω
L2
100 pF
C2
L1
R
C1
C1
100 pF
C2
L1
R
C1
C1
L2
VCC1
100 pF
50
Ω μstrip
620
Ω
4 pF
100 pF
0.1
μF
VCC1
22 k
Ω
47 k
Ω
3.3 nH
LNA GAIN
MIX GAIN
VCC2
VCC1
NOTE:
Microstrip Inductor, Z0 = 50 Ω, L = 102 mils
suggested compared values.
51
Ω*
F
i
l
t
e
r
33 nF
47 nH
L
F
i
l
t
e
r
IF+
IF-
L
F
i
l
t
e
r
IF2+
IF2-
LO IN
LNA IN
7.5 nH
50
Ω μstrip
L=130 mils
W=12 mils
Z0=50 Ω
ENABLE
IP SET
*This resistor improves NF and IIP3 for
VCC = 3.0 V.
BYPASS
See
Note 4
See
Note 5
See
Note 3
See
Note 1
See
Note 6
See
Note 8
See
Note 8
See
Note 8
See
Note 8
See
Note 7
See Note 2
See Note 8
See
Note 10
See Note 11
See
Note 9
NOTES:
1. DC blocking capacitor.
2. LNA emitter degenerator. As the value of inductance is increased, the gain will decrease, and the IIP3 will increase.
3. Mixer preamp degeneration inductor. As the value of inductance is increased, the gain will decrease, and the IIP3 will increase.
4. An external resistor connected to this 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.
See Note 11
See Note 12
See Note 8
Output Interface Network
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