UM9608 MICROSEMI, UM9608 Datasheet - Page 12

• Manufacturer Part Number: UM9608
• Manufacturer: MICROSEMI
• Type: Switchr

Specifications of UM9608

• Configuration: Single
• Power Dissipation: 500mW
• Operating Temperature Classification: Military
• Reverse Voltage: 400V
• Operating Temperature (min): -65C
• Pin Count: 2
• Applications Frequency Range: UHF/SHF
• Lead Free Status / RoHS Status: Not Compliant

allowable power dissipation of the series mounted UM9401.
Using a gap in the line of 0.190” (4.82mm) and lead soldered
attached spacing of 0.250” (6.35mm) the power rating of the
UM9401 is 6 watts at a 25
performing a thermal resistance measurement on the circuit
mount UM9401. The relationship that derives the maximum
transmitter power, P
P
The CW power handling capacity is determined by the
Copyright  2005
Rev. 0, 2006-01-17
T
=
P
Rs
DISS
Zo



σ
2
T
σ
+
is:
1



2
o
C ambient. This was determined by
10
10
10
10
UM9601/UM9401 900 MHz MICROSTRIP ANTENNA SWITCH
3
2
1
0
MAX. TRANSMITTER POWER vs FORWAD CURRENT FOR
0
25
Microsemi
AMBIENT TEMPERATURE
50
FOR MICROSTRIP 900 MHz ANTENNNA SWITCHES
TYPICAL
maximum transmitter power curve is given and shows that this
circuit is able to handle 100 watts of transmitter power at 100
mA forward bias and totally mismatched antenna at an ambient
temperature of 60
handling increases to 400 watts under the same bias and
ambient conditions.
PIN diode antenna switch design. The UM9401 and UM9601
PIN diodes are designed for low distortion applications. The
level of distortion produced by this 900 MHz antenna switch
when operated in the transmit state (forward bias of 100 mA) is
expected to be at least 90 dB below the carrier for a 50 watt
transmitter level. In the receiver
state (zero bias) the intermodulation distortion
caused by two in-band signals at 0 dBm are estimated to be at
least 100 dB below this level
75
C
Distortion is an important consideration in the selection of a
Using resistance values for UM9401 and UM9601 the
AND MICROWAVE APPLICATIONS
where σ = maximum antenna SWR
O S
100
UM9601 – UM9608
O
125
o
C. For a perfectly match antenna the power
Zo = 50 Ohms
SWR = INFINITE
S
150
100 mA
200mA
50 mA
20 mA
10 mA
175
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