Control Devices
LIMITER DIODES
DESCRIPTION
The GC4700 series diodes are specially processed PIN
diodes designed for use in passive or active limiters at
frequencies through Ku band.
Twelve categories of devices are offered for flexibility in
design of low (lower Vb, fastest turn-on time), medium
and high (highest Vb, slowest turn-on time) power
limiters.
APPLICATIONS
A diode limiter is a power-sensitive variable attenuator
that uses the non-linear properties of the diode to
provide an impedance mismatch when sufficient
amounts of RF power are incident on the device. The
output power is reduced to a level that will not overdrive
a receiver, burn out a mixer, etc. For varying input
power levels in excess of the diode’s threshold level,
the limiter’s output power tends to remain constant.
A passive limiter is one in which the limiter diodes are
“turned on” by the RF signal itself. An active limiter is
one in which the limiter diodes are “turned on” primarily
by an external bias current typically supplied by a
Schottky detector diode which senses the incident
signal.
Since limiter diodes are not designed to dissipate large
amounts of power, the limiter must reflect or divert the
excess incident power back to the source or to another
load (i.e. via a circulator, hybrid coupler, etc.).
Limiter diodes may be used in wave guides, coax,
microstrip, stripline or other media. Single or cascaded
devices may be used, depending on power levels.
RATINGS
Maximum Leakage Current: 0.5 uA at 80% of
minimum rated Vb
Operating Temperature:
-55° C to + 150° C
CHIP ELECTRICAL PARAMETERS: T
A
= 25°C
V
B
MIN(Volts)
I
R
=10µA MAX
20
20
45
45
45
120
120
120
15
15
30
30
C
J0
TYP
(pF)
0.20
0.50
0.20
0.50
0.70
0.20
0.60
0.80
0.12
0.20
0.12
0.20
C
J0
MAX
(pF)
0.15
0.30
0.15
0.30
0.50
0.15
0.30
0.50
0.10
0.15
0.10
0.15
TYPICAL
R
S
@10 mA
Ohms
1.5
1.2
1.5
1.2
1.0
1.5
1.0
0.5
20
1.5
2.0
1.5
TYPICAL
T
L
(nS)
5
10
10
15
20
50
50
100
5
5
7
7
TYPICAL
1
θP
(˚C/W)
20
12
15
10
6
1.2
0.5
0.3
30
20
20
15
MAXIMUM
2
THERMAL
RESISTANCE
(˚C/W)
100
80
80
60
40
40
20
15
120
80
100
70
MODEL
NUMBER
GC4701
GC4702
GC4711
GC4712
GC4713
GC4721
GC4722
GC4723
GC4731
GC4732
GC4741
GC4742
1) Pulse length 1 microsecond.
2) As measured in style 30 package.
Microsemi – Lowell
75 Technology Drive, Lowell, MA 01851 Tel. (978) 442-5600
Control Devices
LIMITER DIODES
TYPICAL LIMITER PERFORMANCE RATINGS: T
A
= 25°C
MODEL
NUMBER
GC4701
GC4702
GC4711
GC4712
GC4713
GC4721
GC4722
GC4723
GC4731
GC4732
GC4741
GC4742
MAXIMUM
PEAK
PIN
@ 1.0
µ
S (dBm)
TYPICAL
LEAKAGE
Pout
(dBm)
TYPICAL
THRESHOLD
(dBm)
TYPICAL
INSERTION LOSS
(dB)
MAXIMUM
CW
POWER
(Watts)
+50
+53
+53
+56
+59
+60
+63
+66
+47
+50
+47
+50
+22
+24
+27
+29
+31
+39
+41
+44
+19
+22
+24
+27
+10
+10
+15
+15
+15
+20
+20
+20
+7
+4
+12
+12
0.1
0.2
0.1
0.2
0.2
0.1
0.2
0.2
0.1
0.1
0.1
0.1
2
3
3
4
5
5
10
15
2
3
3
4
Notes:
1. Available in standard case styles 00, 30, 35, 42 AND 45. When ordering specify the desired case style by adding its number as a suffix to the
basic part number. Some other case styles are available on request. Please contact the factory for availability.
Typical Power Leakage vs I Region Thickness
Typical Limiter Transfer Characteristics
Microsemi – Lowell
75 Technology Drive, Lowell, MA 01851 Tel. (978) 442-5600
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