Quick Start; Operation Inside The Sim900 Mainframe - Stanford Research Systems SIM954 Operation And Service Manual

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1.1 Quick Start

1.2 Operation Inside the SIM900 Mainframe

The SIM954 contains two mostly independent, identical small RF
power amplifiers with a gain of
bandwidth of 300MHz. The output voltage limit of
achieved with a modest 2 5V input voltage, so most test equipment
can drive a SIM954 channel to its voltage and power limits.
The module was specifically designed to drive laboratory loads like
magnetic coils, capacitors, piezoelectric and electrochemical cells,
small motors, heaters etc.. While these loads often require currents
and voltages beyond the range of many test instruments, driving
them with expensive and bulky power amplifiers generally does not
represent a satisfactory and e cient solution.
Unlike many power amplifiers, the SIM954 can operate as a precise
DC amplifier, wideband RF amplifier and driver stage for di cult
passive loads like ceramic capacitors and high Q resonant circuits. It
will stay unconditionally stable under a variety of load conditions,
and its specifications will deteriorate in a predictable manner.
The two otherwise independent amplifier channels share a common
power supply and are limited by the total power consumption per-
missible for a single wide SIM module. See section 2.6 on page 2 –
12 for further discussion.
The SIM954 is primarily designed to work inside a SIM900 main-
frame. Like all other SIM modules, it should not be hot-plugged or
removed under power.
Because of their higher current requirements, the number of SIM954
operated in a single SIM900 mainframe should be limited to a max-
imum of four. The modules should be separated by at least one slot
from each other, and any other module next to a SIM954 should not
have an increased power consumption itself.
SIM modules with higher power consumption, like the SIM965 Ana-
log Filter and the SIM940 Rubidium Frequency Standard, should not
be operated next to a SIM954 .
Running at its power limit, a SIM954 can heat up to approximately
50 C. Some low power SIM modules like the SIM928 Battery Isolated
Voltage Source (because of its temperature sensitive NiMH batteries),
can not tolerate these temperatures and should not be operated in a
slot next to a SIM954 .
Precision SIM modules like the SIM910 and SIM911 Preamplifiers,
SIM954 300 MHz Dual Inverting Driver Amplifier
Operation
4 (12dB) into 50 and a
10V can be
3dB