Bruker BioSpin BLAH2000-I E C, Operating & Service Manual

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Operating & Service Manual Version 001 BRUKER BIOSPIN 21 (47)
5
Technical
Description 5
System Overview 5.1
The BLAH2000-I E C Amplifier 300MHz provides :
•
A RF Output of 2000W on the Output 2000W and more at 0dBm input over the
frequency range 300MHz.
The RF section of the system consists of a linear module BLM2000 mounted
around a single self-contained Push and Pull fan assembly heatsink.
A linear class A / AB driver using switches and bias voltage gatings, delivers the
RF input power to the four power amplifiers through a 4 ways in-phase splitter.
This driver is located on the bottom of the heatsink assembly.
The four class AB power amplifiers are located on the top of the heatsink
assembly and are combined by the means of 4 ways in-phase combiner.
The output of the combiner is connected to a bi-directional coupler mounted in the
BLM2000 module.
The entire system is controlled by a Digital Signal Processing control board,
processing information from the amplifier and blanking signal, providing protection
from excessive peak power, duty cycle and pulse width for average power,
maximum reflected power and heatsink over-temperature.
The DSP control board reads the indentification information of the amplifier (BIS).
Monitoring of fan status, supply status and LED's status is also performed by the
control board.
Circuits such as Fan Status board located on the RF module, Status LED’s board,
and a CAN Bus interface complete the amplifier assembly.