PE42556_15 Datasheet, PDF (4/10 Pages) Peregrine Semiconductor Corp. – SPDT RF Switch

Low Frequency Power Handling: Z_L = 50Ω
Figure 4 provides guidelines of how to adjust the
Vdd and Input Power to the PE42556 device. The
upper limit curve represents the maximum Input
Power vs Vdd recommended for this part at low
frequencies only. Please consult Table 3 for the
1 MHz ≤ 13.5 GHz range.
Figure 4. Maximum Operating Power Limit
vs. Vdd and Input Power @ 9 kHz
Upper Power Limit
8
6
4
2
0
-2
-4
-6
-8
-10
-12
2.9
3
3.1
3.2
3.3
3.4
3.5
3.6
Vdd (V)
To allow for sustained operation under any load VSWR condition, max power
should be kept 6dB lower than max power in 50 Ohm.
PE42556
Product Specification
Figure 5 shows how the power limit in Figure 4 will
increase with frequency. As the frequency
increases, the contours and Maximum Power
Limit Curve will increase with the increase in
power handling shown on the curve.
Figure 5. Operating Power Offset vs.
Frequency (Normalized to 9 kHz)
Power Handling Scaling with Frequency
30
25
20
15
10
5
0
1
10
100
1000
Freq (kHz)
Power Handling Examples
Example 1: Maximum power handling at 100 kHz,
Z = 50 ohms, VSWR 1:1, and Vdd = 3V
 The power handling offset for 100 kHz from
Fig. 5 is 7 dB
 The max power handling at Vdd = 3V is 5.5 dB
from Fig. 4
 Derate power under mismatch conditions
 Total maximum power handling for this
example is 7 dB + 5.5 dB = 12.5 dBm
©2009-2012 Peregrine Semiconductor Corp. All rights reserved.
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Document No. 70-0289-06 │ UltraCMOS^® RFIC Solutions