Rainbow Electronics MAX2327 - Manual (Page 17)

MAX2320/21/22/24/26/27
Adjustable, High-Linearity,
SiGe Dual-Band LNA/Mixer ICs
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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
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
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
-9.3dBm -7.6dBm 7.1dBm Third-Order Input Intercept
3.0dB 2.6dB 12.4dB Noise Figure
PARAMETER
22.5dB
HIGH GAIN,
LOW LINEARITY
24dB 7.5dB Conversion Power Gain
HIGH GAIN,
HIGH LINEARITY
LOW GAIN
Table 7. Cellular LNA S Parameters in High-Gain, High-Linearity Mode
0.109 59.1 0.669 -40.8 0.496 1000 -90.6 3.3 74.9
0.104 58.3 0.674 -39.3 0.503 950 -88.5 3.5 76.6
0.099 58.8 0.677 -38.3 0.51 900 -86.1 3.7 79.4
0.096 60.1 0.683 -37.6 0.52 850 -83.7 3.88 81.9
0.0908 60 0.689
0.089 60.6
-36.6
0.696 -35.9
0.714
S22
(mag)
-34.7 0.085
S12
(mag)
60.9
S22
(phase)
S12
(phase)
0.534 800 -81.2 4.13
0.548 750 -78.4
84.4
4.39 87.9
4.63
S21
(mag)
92.1 0.579
S11
(mag)
700 -74.8
S21
(phase)
FREQUENCY
(MHz)
S11
(phase)