Operating & Service Manual Version 002 BRUKER BIOSPIN 5 (53)
1
General
Information 1
Introduction 1.1
The BLAH1000 E Amplifier 700-900MHz INR is a broadband linear pulse power
amplifier specifically designed for Nuclear Magnetic Resonance (NMR) and
Magnetic Resonance Imaging (MRI) applications for 16,4 to 21,1 Teslas Systems.
It is commercialized under the BRUKER BIOSPIN part number W1345091.
It is operated in AB linear class and provides 1000W and more peak RF power
over the frequency range 650-900MHz on the 1000W channel for the Solid
applications and 100W and more peak RF power on the 100W channel for the
High Resolution applications.
The amplifier is equipped with N-Channel RF LDMOSFETs transistors of the
latest generation. The unit can provide full power for any combination of pulse
width and duty cycle up to 100ms and 25% in High Resolution mode and 5% in
Solid mode.
Its built-in protection circuitry will allow lower power pulses for longer pulse widths
and duty-cycles, maintaining a 50W average power for the Solid application on
MAIN OUT 1000W/100W output and a 25W average power for the High
Resolution application on AUX OUT 1000W/100W output.
The electronic protection circuitry has been designed to protect against:
• Excessive power output level (overdrive)
• Excessive pulse repetition rate (over duty-cycle protection)
• Excessive pulse duration (over pulse-width)
• More than 50% reflected RF power (mismatch when VSWR ≥ 6)
• Thermal protection (overheat)
The amplifier is powered by an external switched power supply assembly housed
in a 19", 2U, 480mm deep rack cabinet and provides the +32VDC for the power
amplifiers, in addition to all low level voltages for the system.
The supply is self protected for overcurrent and overvoltage.
The amplifier is housed in a 19", 3U, 520mm deep rack cabinet.
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General