12
RF Device Data
Freescale Semiconductor
MRF1518NT1
Note: ZOL* was chosen based on tradeoffs between gain, drain efficiency, and device stability.
Figure 38. Series Equivalent Input and Output Impedance
f
MHz
Zin
Ω
ZOL*
Ω
450 4.9 +j2.85 6.42 +j3.23
Zin
= Complex conjugate of source
impedance with parallel 15 Ω
resistor and 82 pF capacitor in
series with gate. (See Figure 1).
ZOL* = Complex conjugate of the load
impedance at given output power,
voltage, frequency, and ηD
> 50 %.
VDD
= 12.5 V, I
DQ
= 150 mA, P
out
= 8 W
470 4.85 +j3.71 4.59 +j3.61
500 4.63 +j3.84 4.72 +j3.12
520 3.52 +j3.92 3.81 +j3.27
Zo
= 10
Ω
520
f = 450 MHz
Zin
ZOL*
520
f = 450 MHz
Zin
ZOL*
Input
Matching
Network
Device
Under Test
Output
Matching
Network
f
MHz
Zin
Ω
ZOL*
Ω
820 1.42 -j0.32 2.34 +j0.23
Zin
= Complex conjugate of source
impedance.
ZOL* = Complex conjugate of the load
impedance at given output power,
voltage, frequency, and ηD
> 50 %.
VDD
= 12.5 V, I
DQ
= 150 mA, P
out
= 8 W
830 1.39 -j0.21 2.36 +j0.47
840 1.32 -j0.16 2.40 +j0.69
850 1.23 -j0.13 2.37 +j0.79
Zo
= 10
Ω
f = 820 MHz
Zin
ZOL*
f = 850 MHz
f = 820 MHz
f = 850 MHz
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