R&S SMB Instrument Design and Function Description
1407.0806.82 3.5 E-6
Switching regulators
T
he built-in switching regulators generate the additional 1.2 V, 1.8 V, 3.3 V, 7 V and 28 V supply voltages.
Controller
Central Controller of the SMB100A including all memory devices and external interfaces.
FPGA (SMB_COM)
The SMB_COM FPGA contains the serial bus for internal communication of the instrument, timer
functions, the display controller and the logic of the frequency counter.
Keyboard Controller
The keyboard controller notifies the processor about keyboard and spin wheel events. The keyboard
controller switches on or off the power supply module and memorizes the power on state of the
instrument when the main power is cut. This state is reconstituted on powering the instrument again.
Diagnostic ADC
The diagnostic ADC is used for measuring the voltages in the unit. These voltages are used for internal
adjustments and the ALC S&H mode of the SMB100A. Additionally the failure diagnostic of the instrument
is carried out by the use of ADC.
EEPROM
The following data is stored here: Serial number of the instrument, header line data of the board.
Temperature sensor
A temperature sensor mounted on the Basis Board monitors the temperature. If a defined temperature
above the guaranteed maximum operating temperature is exceeded, the power supply is switched off. So
the SMB100A secures itself against damage due to overheating.
Fan Controller
A fan for cooling the RF modules is connected to the BASIS BOARD and directly controlled according to
the temperature of the Basis Board. This is done independent of the controller.
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