Bruker BLAH1000 E, Operating & Service Manual

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Operating & Service Manual Version 002 BRUKER BIOSPIN 21 (53)
5
Technical
Description 5
System Overview 5.1
The BLAH1000 E Amplifier 700-900MHz requires the additional Bruker Biospin
Power Supply to provide :
•
A RF Output of 1000W and more on the Solid output MAIN OUT, over the full
frequency range 650-900MHz when it is selected for Solid application with
SEL H1000/H100 command controlled at TTL level low.
•
A RF Output of 100W and more on the High Resolution output AUX OUT, over
the full frequency range 650-900MHz when it is selected for High Resolution
application with SEL H1000/H100 command controlled at TTL level high.
The RF section of the system consists of an embedded router fixed on the front
panel and a linear module BLMH1000-E I/OR mounted around a single self-
contained Push and Pull fan assembly heatsink, a bi-directional High Dynamic
coupler and a mechanical RF relay mounted on the bottom of the amplifier
housing.
The embedded router has three RF inputs and one RF output feeded to the driver
amplifier located on the BLMH1000-E I/OR module.
A linear class A / AB driver using switches and bias voltage gatings delivers the
RF input power to the two power amplifiers through a 2 ways in-phase splitter,
located on the left wall, when the Solid application is selected. When the High
Resolution application is selected, this driver is capable to deliver 100W and more
power output. It is located on the bottom of the heatsink assembly.
The two class AB power amplifiers are located on the top of the heatsink
assembly and are combined by mean of a 2 ways in-phase combiner located on
the right wall.
The output of the combiner and the driver are connected via a mechanical relay to
a bi-directional high dynamic coupler.
The selection of the 1000W channel (MAIN OUT) or the 100W channel (AUX
OUT) is made with a pair of RF power relays controlled by the SEL H1000/H100
input signal.
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 identification information of the amplifier (BIS).
Monitoring of fan status, supply status and LED's status is also performed by the
control board.