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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), 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.
DC BLOCK
4 COARSE (HIGH POWER) LIMITER DIODE
DC BLOCK CLEAN UP OUTPUT (FAST) LIMITER DIODE
INPUT
DC RETURN
BASIC TWO-DIODE LIMITER
CHIP ELECTRICAL PARAMETERS: TA = 25C
MODEL NUMBER VB MIN (VOLTS) IR = 10A CJO TYP (pF) CJ6 MAX (pF) TYPICAL RS @10 mA (Ohms) TYPICAL TL (nS) TYPICAL MAXIMUM THERMAL (C/W)
P1
2
(C/W)
RESISTANCE
GC4701 GC4702 GC4711 GC4712 GC4713 GC4721 GC4722 GC4723 GC4731 GC4732 GC4741 GC4742
20 20 45 45 45 120 120 120 15 15 30 30
0.20 0.50 0.20 0.50 0.70 0.20 0.60 0.80 0.12 0.20 0.12 0.20
0.15 0.30 0.15 0.30 0.50 0.15 0.30 0.50 0.10 0.15 0.10 0.15
1.5 1.2 1.5 1.2 1.0 1.5 1.0 0.5 2.0 1.5 2.0 1.5
5 10 10 15 20 50 50 100 5 5 7 7
20 12 15 10 6 1.2 0.5 0.3 30 20 20 15
100 80 80 60 40 40 20 15 120 80 100 70
1) Pulse length 1 microsecond. 2) As measure in style 30 package.
SEMICONDUCTOR OPERATION
75 T echnology Drive Lowell, MA 01851 T el: 978-442-5600 Fax: 978-937-3748
83
TOC
Control Devices
LIMITER DIODES
TYPICAL LIMITER PERFORMANCE RATINGS: TA = 25C
MAXIMUM MODEL NUMBER PEAK PIN @1.S (dBm) TYPICAL LEAKAGE Pout (dBm) TYPICAL THRESHOLD (dBm) TYPICAL INSERTION LOSS (dB) MAXIMUM CW POWER (Watts)
GC4701 GC4702 GC4711 GC4712 GC4713 GC4721 GC4722 GC4723 GC4731 GC4732 GC4741 GC4742
Notes:
+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 +7 +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
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
LEAKAGE POWER ABOVE 1.0GHz (dB)
+9 +8 +7 +6 GC4721 +5 +4 +3 +2 +1 0
POWER OUT (mw)
G
C4
1 72
+1000
0dB
10dB
20dB
41
30dB
+100
THRESHOLD
GC 47
47 01,
GC4701, 4741
8
+10
2
4
6
10
12
14
16
18
FREQUENCY (GHz)
+1.0 +10 +20 +30 +40 +50 +60 PEAK POWER INPUT (dBm)
RATINGS
Maximum Leakage Current: Operating Temperature: 0.5A at 80% of minimum rated breakdown 55C to +150C
SEMICONDUCTOR OPERATION
75 T echnology Drive Lowell, MA 01851 T el: 978-442-5600 Fax: 978-937-3748
84

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