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Adjustable, High-Linearity,
SiGe Dual-Band LNA/Mixer ICs
Layout Considerations
Keep RF signal lines as short as possible to minimize
losses and radiation. Use high-Q components for the LNA
input matching circuit to achieve the lowest possible
noise figure. At the digital mixer outputs, keep the differ-
ential signal lines together and of equal length to ensure
signal balance. For best gain and noise performance, sol-
der the slug evenly to the board ground plane.
Table 5. Typical Cascaded Performance of Cellular-Band Receiver with 3dB Interstage
Filter Loss
PARAMETER
Conversion Power Gain
Noise Figure
Third-Order Input Intercept
HIGH GAIN,
HIGH LINEARITY
25.4dB
2.1dB
-8.9dBm
HIGH GAIN,
LOW LINEARITY
24.5dB
2.3dB
-10.6dBm
LOW GAIN,
HIGH LINEARITY
8.9dB
11.8dB
-6.8dBm
FM
22.7dB
3.3dB
-6.8dBm
Table 6. Typical Cascaded Performance of PCS-Band Receiver with 3dB Interstage
Filter Loss
PARAMETER
Conversion Power Gain
Noise Figure
Third-Order Input Intercept
HIGH GAIN,
HIGH LINEARITY
24dB
2.6dB
-7.6dBm
HIGH GAIN,
LOW LINEARITY
22.5dB
3.0dB
-9.3dBm
LOW GAIN
7.5dB
12.4dB
7.1dBm
Table 7. Cellular LNA S Parameters in High-Gain, High-Linearity Mode
FREQUENCY
(MHz)
700
750
800
850
900
950
1000
S11
(mag)
0.579
0.548
0.534
0.52
0.51
0.503
0.496
S11
(phase)
-74.8
-78.4
-81.2
-83.7
-86.1
-88.5
-90.6
S21
(mag)
4.63
4.39
4.13
3.88
3.7
3.5
3.3
S21
(phase)
92.1
87.9
84.4
81.9
79.4
76.6
74.9
S12
(mag)
0.085
0.089
0.0908
0.096
0.099
0.104
0.109
S12
(phase)
60.9
60.6
60
60.1
58.8
58.3
59.1
S22
(mag)
0.714
0.696
0.689
0.683
0.677
0.674
0.669
S22
(phase)
-34.7
-35.9
-36.6
-37.6
-38.3
-39.3
-40.8
______________________________________________________________________________________
17
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