7700A & 7700T Series Detectors
Tunnel Diode Detectors
Product Data Sheet
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Description:
The 7700A series features a standard cylindrical coaxial pack-
age with SMA connectors and internal hermetically sealed
module containing microstrip hybridized circuit and chip de-
vices.
The 7700T provides capability for multiple, packaged tunnel
diodes with coaxial matching structure and coaxial capacitor.
DC return coil is included. Ease of diode selection and match
(unit-to-unit) is an advantage of this package.
These detectors provide a usable 67 dB dynamic range from
nominal TSS of -50 dBm, through maximum saturation at +17
dBm. Within this range, square law transfer response is
-50 dBm through -15 dBm, linear region is -15 dBm through
+5 dBm and saturation +5 dBm through +17 dBm. Above +17
dBm RF input power diode damage and subsequent burnout
occurs.
Tunnel diode detectors have excellent temperature stability,
very fast pulse response time, good RF match and broadband
frequency flatness. Open circuit voltage sensitivity (K) and
high power burnout are less than silicon based Schottky de-
tectors, but the tunnel detector’s relatively low video imped-
ance with no dc bias requirement enables dc and ac coupling
with video and log video post amplifiers.
Specifications:
Frequency
Range (GHz)
Voltage
Sensitivity
(K)
Min.
(2)
VSWR
Typ.
(3)
Flatness
Max. (dB)
Tss Typ.
(-dBm)
(4)
RF Bypass
Capacitance
Typ. (pF)
Video
Rise Time
Resistance
Typ. (nS)
Typ. (Ohms)
(5)
(6)
Part
Number
(1)
800
2.0:1
2.0:1
2.0:1
2.3:1
2.3:1
3.0:1
2.5:1
3.0:1
+0.5
+0.5
+0.6
+0.6
+1.0
+1.0
+1.5
+1.5
50
50
50
50
50
50
50
50
100
100
20
20
12
12
20
20
13
13
4
4
3
3
4
4
120
120
120
120
100
100
100
100
7700A-0020
7700T-0020
7700A-0021
7700T-0021
7700A-0022
7700T-0022
7700A-0023
7700T-0023
0.1 – 2.0
800
800
2.0 – 8.0
700
500
8.0 – 18.0
600
500
2.0 – 18.0
500
1.
2.
Detectors are normally supplied with negative (-) output voltage polarity, referenced to case ground. Positive
(+) output polarity is available for most parts. To designate, add suffix “P” to end of part numbers.
Minimum open circuit voltage sensitivity (K) in mV/mW is measured at -20 dBm RF input power into 30K ohm,
external video load resistance (RL).
VSWR measured at -20 dBm RF power input into 100 ohm, external video load resistance.
Tangential signal sensitivity (Tss) is measured using a video amplifier restricted to 2 MHz bandwidth and
having a noise contribution of 3 dB maximum.
Pulse rise time (tr) in nanoseconds, is measured into an external load (RL) of 100 ohms with 12 picofarads in
parallel.
Video resistance is measured at -20dBm.
Notes:
3.
4.
5.
6.
For further information please contact:
Cobham Sensor Systems
1001 Pawtuckett Blvd.
Lowell, MA 01854 USA
Tel: 877-COBHAM7 (877-262-4267)
Email: Sales.Space&Components@Cobham.com
Data Sheet Subject to Change Without Notice
www.cobham.com
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