Microwave Diode and Capacitors - Cobham plc

Gallium Arsenide Multiplier Varactor Diodes
The ML 48700 Series of Gallium Arsenide Abrupt Junction Multiplier Varactors is specifically designed to provide
solid state, high order multiplication at output frequencies extending to 100 GHz. All varactors in this series are
available in either package or chip form. The cathode is the heat sink end of the package.
This series of Gallium Arsenide Multiplier Varactors is intended for medium power harmonic generation with
high conversion efficiency. These diodes may be used to double or triple the frequency outputs of Gunn or
IMPATT oscillators in millimeter wave radar and communication systems. They are also useful in local
oscillators and in millimeter wave phase shifters, modulators and upconverters.
Specifications @ +25°C
Breakdown
Voltage
Notes
(V)
Min
F CO
(GHz)
0.150 –
0.249
0.250 –
0.349
C JO Range
(pF)
0.350 –
0.449
0.450 –
0.549 0.550 – 0.650
15 200 ML48704A ML48705A
15 250 ML48703A ML48704B ML48705B
15 300 ML48702A ML48703B ML48704C ML48705C
15 350 ML48701A ML48702B ML48703C ML48704D ML48705D
15 400 ML48701B ML48702C ML48703D ML48704E ML48705E
15 450 ML48701C ML48702D ML48703E
15 500 ML48701D ML48702E
15 550 ML48701E
25 200 ML48708A ML48709A ML48710A
25 250 ML487-7A ML48708B ML48709B ML48710B
25 300 ML48706A ML48707B ML48708C
25 350 ML48706B ML48707C
25 400 ML48706C
1. Junction capacitance (C JO ) is measured at 1 MHz and 0 volts on a bridge which has been balanced with
a shielded test holder connected in place but open circuited.
2. Cut-off frequency measurements (FCO) are made at 0 volts. See curve of Figure 1 showing typical
FC6 (cut-off at -6 volts) versus FCO (cut-off at 0 volts) performance curve.
3. All GaAs multiplier diodes are available in the following case styles 30, 31, 32, 36, 91, 94, 95, 120, 126,
128, 155, 166, 168. When ordering, specify the desired case by adding the case designation as a suffix
to the model number.
4. Nominal package parastics (CP and LS) are given for each case style with the outline drawing. The Cp
tolerance listed is typically ±0.02 pF.
5. The measured series resonant frequency of each varactor can be supplied with the diode to special
order.
6. ∆N 1 = = 0.52 Typical, β = = 2.20 Typical
7. Breakdown voltage is measured at -10µA. Other breakdown voltages are available on special request.
8. Storage / Operating Temperature. -65°C to +150°C
Cobham MAL Ltd trading as Cobham Sensor Systems www.cobham.com/sensorsystems
© Cobham plc, 2010.
Whilst every effort is made to ensure the accuracy of the information contained in this brochure, no responsibility can be accepted for any errors and/or
omissions. Descriptions and specifications of products are subject to change without notice Page 6 of 37