Doc #9300-0007 Rev 1
“Stand Alone” RF Power Capabilities Of The
DEIC420 MOSFET Driver IC at 3.6, 7, 10, and 14 MHZ.
Matthew W. Vania
Directed Energy, Inc.
Abstract
The DEIC420 MOSFET driver IC is evaluated as a “stand alone” RF
source at 3.6, 7, 10, and 14 MHZ. To create up to 47W of CW RF all that
is required is a clock oscillator, RF resonant tank, and associated output
matching circuitry. This module can be used as a medium power RF
source for amateur radio use, a laboratory RF source, a source of sine
wave gate drive, and many other applications where a compact RF source
is required.
TECHNICAL NOTE
Contac
t: support@ixysrf.com
Web: ixysrf.com
Li
ttelfuse, Inc. 2019
1
Doc #9300-0007 Rev 1
FIGURE 1: DEIC420 GATE DRIVER IC
Introduction
The DEIC420 is a 20A
pk
high-speed MOSFET gate drive IC available from DEI/IXYS. It is
compact and self-contained requiring only VCC, a 5V TTL clock signal, and appropriate heat
sinking to produce a pulsed RF output signal. The addition of a simple L/C resonant tank and
an impedance matching network produces a sine wave output to a standard 50Ω load. With the
addition of a keying circuit and additional harmonic filtering the IC can be utilized as an Amateur
Radio CW source for operation through at least 20 Meters (14MHZ).
Theory of Operation
When gated via the TTL input or clock, the DEIC420 converts the input to a high-current sub-
10ns rise time output pulse via multiple totem-pole stages. This output signal is designed to
drive a low impedance capacitive load like a MOSFET gate. In this application, the IC drives a
low impedance series-resonant tank and appropriate matching circuitry to ultimately drive a 50Ω
load.
+VCC
+VCC
L1
SIT
1 2
C19
SIT
1
2
1
2
1
2
1
2
1
2
R7
0 4BEADS 1/2W
R2
0.25 2W
J2 RF_OU
T
2
1
R5
0.25 2W
R4
10
R6
49.9
T1
+
C5
4.7
+
C9
4.7
C11
.47
+
C12
10
J1
SMB
+VCC
C7 .47
C8 0.01
E9
TP
1
C16 0.01
C15 .47
C14 0.01
C4 0.01
C13 .47
C3 .47
+
C6
4.7
+
C10
4.7
U1
DEIC420
VCC
1
IN
2
VCC
3
GND
4
OUT
5
GND
6
C1 470pF
C2 100pF
C17
100pF
C18
470pF
E10
TP
1
FIGURE 2: DEIC420 RF DRIVER SCHEM ATIC DIAGRAM
Littelfuse, Inc. 2019