MRF5003 Datasheet, PDF (10/10 Pages) Motorola, Inc – N-CHANNEL BROADBAND RF POWER FET

AMPLIFIER DESIGN
Impedance matching networks similar to those used with
bipolar transistors are suitable for the MRF5003. For exam-
ples see Motorola Application Note AN721, “Impedance
Matching Networks Applied to RF Power Transistors”. Both
small–signal S–parameters and large–signal impedances
are provided. While the S–parameters will not produce an
exact design solution for high power operation, they do yield
a good first approximation. This is an additional advantage of
RF power MOSFETs.
Since RF power MOSFETs are triode devices, they are not
unilateral. This coupled with the very high gain of the
MRF5003 yield a device capable of self oscillation. Stability
may be achieved by techniques such as drain loading, input
shunt resistive loading, or output to input feedback. Different
stabilizing techniques were applied to the test fixture and
demonstration amplifiers. The RF test fixture implements a
parallel resistor and capacitor in series with the gate while
the demonstration amplifier utilizes a 43 Ω shunt resistor
from gate to ground. Both circuits have a load line selected
for a higher efficiency, lower gain, and more stable operating
region.
Two port stability analysis with the MRF5003 S–parame-
ters provides a useful tool for selection of loading or feed-
back circuitry to assure stable operation. See Motorola
Application Note AN215A, “RF Small–Signal Design Using
Two–Port Parameters”, for a discussion of two port network
theory and stability.
A N ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ12ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ3
R
B
PACKAGE DIMENSIONS
ÉÉÉ _SEATING
PLANE
ÉÉ ÉÉÉÉÉÉ C
ÉÉ ÉÉÉÉÉÉ _G
F
2
ÉÉÉÉÉÉÉÉ ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ _D
ÉÉ ÉÉÉÉÉÉ ₁
ÉÉÉ _E
L
NOTES:
S
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3
STYLE 2:
PIN 1. GATE
INCHES
DIM MIN MAX
A 0.260 0.270
B 0.200 0.210
C 0.090 0.104
D 0.040 0.050
E 0.022 0.028
F 0.015 0.025
G 0.005 0.015
L 0.100 0.110
N 0.226 0.236
R 0.166 0.176
S 0.025 0.035
MILLIMETERS
MIN MAX
6.60 6.86
5.08 5.33
2.29 2.64
1.02 1.27
0.56 0.71
0.38 0.64
0.13 0.38
2.54 2.79
5.74 5.99
4.22 4.47
0.64 0.89
2. DRAIN
3. SOURCE
CASE 430–01
ISSUE O
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MRF5003
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10
*MRF5003/D* ^{MOTOROLA RF DEVICMERDF5A0T0A3/D}