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Application Information
Table 6. Typical 1575 MHz Evaluation Board Performance (continued)
(Vcc = 2.75V, T A = 25° C )
Characteristic
Symbol
Min
Typ
Max
Unit
Output Return Loss
High Gain
Bypass
S22
—
—
-13
-18
-9
-12
dB
3.2
1960 MHz Application
These application circuits are designed to demonstrate performance at 1960 MHz. Typical results of
NF = 1.4 dB, S21 gain > 18 dB and OIP3 of 16 dBm. Two values of bias resistor R1 are shown to
demonstrate performance for different IP3 and Icc requirements. Resistor R3 is used to de-Q output
inductor L2 and adjust gain and return losses. Inductor L3 provides bias to the logic circuit. Reducing R3
lowers gain and improves return losses. Typical performance that can be expected from this circuit at 2.75
V is listed in Table 7 .
Figure 8 is the 1960 MHz application schematic with package pinouts and the circuit component topology.
C1
2.4
L1
5.1 nH
RF IN
pF
5
4
Gnd
Enable
6
3
R1
1.2 k
R2
10
Rbias
C2
0.9 pF
Gain
7
8
Logic
2
1
L2
3.3 nH
R3
620
RF
OUT
Gnd
L3
2 70 nH
C3
33 pF
C4
.01 uF
Vcc
Figure 8. 1960 MHz Application Schematic
Table 7 shows the electrical characteristics for the 1960 MHz evaluation board.
Table 7. Typical 1960 MHz Evaluation Board Performance
(Vcc = 2.75V, Ta = 25°C)
Characteristic
Symbol
Min
Typ
Max
Unit
R1=1.2 K Ω
Frequency
f
—
1960
—
MHz
RF Gain
High Gain
Bypass
G
17.7
-6.5
18.7
-4.9
—
—
dB
Output Third Order Intercept Point
High Gain
Bypass
OIP3
14
19.2
16
20.9
—
—
dBm
MC13851 Advance Information, Rev. 2.0
12
Freescale Semiconductor
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