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1.3 Operation Using an External Power Supply
1.3 Operation Using an External Power Supply
1.4 Interfaces
SIM954 300 MHz Dual Inverting Driver Amplifier
the SIM918 Precision Current Amplifier, the SIM921 AC Resistance
Bridge, the SIM922 and SIM923 Temperature Monitor modules and
the SIM970 Quad Voltmeter might show increased temperature drift
when operated close to a SIM954 amplifier and would likely benefit
from being thermally isolated from a SIM954.
As with any other power amplifier, loads should be connected and discon-
nected with the amplifier powered down to ensure safe operating conditions
for the SIM954 and the load.
Loads should be checked for their ability to handle the voltage, cur-
rent and power output limits of the SIM954 .
Many BNC style 50
ters, mixers, etc., are at risk of being damaged by a SIM954 if no further
precautions against overload are taken.
Unlike other SIM modules, the SIM954 has additional power supply
filtering and protection against inverse polarity conditions and is
therefor somewhat more forgiving when used with custom power
supplies. A well regulated, low noise, bipolar power source with
15 V, 1 A output current can be used to power a SIM954 module.
As with any product that relies on external power, the user is responsible to
ensure that the supply never exceeds the maximum operating voltage, that
short circuit currents are limited, and that thermal overload is avoided.
Any SIM954 used outside of a mainframe should be kept in a well
controlled thermal environment where none of the ventilation slots
are covered and the sides are at least one inch away from any other
surface.
In this manual it is assumed that the SIM954 is used inside a SIM900
Mainframe. The specifications of the module always refer to use
inside a SIM900 mainframe.
There are a total of four BNCs on the SIM954 front panel. The upper
two are the input and output of Channel 1, and the lower two are the
input and output of Channel 2. The front panel calls out the input
impedance of 50 , the output impedance of 3.3
gain of 4 (12 dB) into a 50
Each channel has an overload indicator, and there is a single "On"
LED on the front panel to indicate that operating voltage is applied
to the module. This is useful when the module is used outside of the
loads, terminators and attenuators, power split-
terminated load.
1 – 3
and the nominal
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