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  Microsemi Electronic Components Datasheet  

GC4731 Datasheet

LIMITER DIODES

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TOC
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), me-
dium and high (highest Vb, slowest turn-on time)
power limiters.
DC BLOCK
INPUT
DC
RETURN
λ
4 DC BLOCK
COARSE
(HIGH
POWER)
LIMITER
DIODE
CLEAN UP
(FAST)
OUTPUT
LIMITER
DIODE
BASIC TWO-DIODE LIMITER
APPLICATIONS
A diode limiter is a power-sensitive variable attenuator
that uses the non-linear properties of the diode to pro-
vide 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 re-
ceiver, 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 de-
tector 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, mi-
crostrip, stripline or other media. Single or cascaded
devices may be used, depending on power levels.
CHIP ELECTRICAL PARAMETERS: TA = 25°C
MODEL
NUMBER
GC4701
GC4702
GC4711
GC4712
GC4713
GC4721
GC4722
GC4723
GC4731
GC4732
GC4741
GC4742
VB
MIN (VOLTS)
IR = 10µA
20
20
45
45
45
120
120
120
15
15
30
30
CJO
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
CJ6
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
1) Pulse length 1 microsecond.
2) As measure in style 30 package.
TYPICAL
RS
@10 mA
(Ohms)
1.5
1.2
1.5
1.2
1.0
1.5
1.0
0.5
2.0
1.5
2.0
1.5
TYPICAL
TL
(nS)
5
10
10
15
20
50
50
100
5
5
7
7
TYPICAL
θP1
(°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
SEMICONDUCTOR OPERATION
75 Technology Drive • Lowell, MA 01851 • Tel: 978-442-5600 • Fax: 978-937-3748
83


  Microsemi Electronic Components Datasheet  

GC4731 Datasheet

LIMITER DIODES

No Preview Available !

TOC
Control Devices
LIMITER DIODES
TYPICAL LIMITER PERFORMANCE RATINGS: TA = 25°C
MODEL
NUMBER
GC4701
GC4702
GC4711
GC4712
GC4713
GC4721
GC4722
GC4723
GC4731
GC4732
GC4741
GC4742
MAXIMUM
PEAK
PIN
@1.µS (dBm)
+50
+53
+53
+56
+59
+60
+63
+66
+47
+50
+47
+50
TYPICAL
LEAKAGE
Pout
(dBm)
+22
+24
+27
+29
+31
+39
+41
+44
+19
+22
+24
+27
TYPICAL
THRESHOLD
(dBm)
+10
+10
+15
+15
+15
+20
+20
+20
+7
+7
+12
+12
TYPICAL
INSERTION LOSS
(dB)
0.1
0.2
0.1
0.2
0.2
0.1
0.2
0.2
0.1
0.1
0.1
0.1
MAXIMUM
CW
POWER
(Watts)
2
3
3
4
5
5
10
15
2
3
3
4
Notes:
1. Available in standard case styles 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.
TYPICAL PERFORMANCE
10,000
+1000
+100
THRESHOLD
+10
GC4721
0dB 10dB 20dB 30dB
GC4701, 4741
+1.0
+10 +20 +30 +40 +50
PEAK POWER INPUT (dBm)
+60
RATINGS
Maximum Leakage Current:
Operating Temperature:
0.5µA at 80% of
minimum rated
breakdown
55°C to +150°C
+9
+8
+7
+6
GC4721
+5
+4
+3
+2
+1 GC4701, 4741
0
2 4 6 8 10 12 14 16 18
FREQUENCY (GHz)
SEMICONDUCTOR OPERATION
75 Technology Drive • Lowell, MA 01851 • Tel: 978-442-5600 • Fax: 978-937-3748
84


Part Number GC4731
Description LIMITER DIODES
Maker Microsemi Corporation
Total Page 2 Pages
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