Technalogix TAU-100, Руководство пользователя

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IV-1
Section IV – RF Components
Amplifier Pallets
The UHFTV-10 pallet is a two stage ultra linear class-A linear pallet. It has a minimum gain of 38dB and
draws no more than 2.75Adc total drain current (the exact bias and drain currents of your system are
found in the spec sheet supplied with each manual). The quiescent and drain currents can be
measured on the UHFTV-10 pallet by measuring the voltage drop across the current sense resistor
found directly at the DC power supply lead input to the pallet. This resistance is 0.01-ohms, providing a
10mV per ampere ratio.
The UHFTV-150 pallet used in the driver and final amplification stages use LDMOS (Laterally Diffused
Metal Oxide Semiconductor) technology. LDMOS technology offers higher gain, efficiency and linearity
over standard MOSFET and Bipolar devices. LDMOS transistors have the added advantage of not
having BEO (Beryllium Oxide) in their construction. These pallets are split into (2) frequency bands
based on the channel ordered (channels 14-38 and channels 33 to 70). The UHFTV-150 amplifier
pallet have a typical gain of 14dB and draw no more than 16Adc (again, the exact bias and drain
currents of your system are found in the spec sheet supplied with each manual). Currents for these
pallets must be measured with an ammeter in series with the power supply lead. Temperature
compensated biasing helps ensure steady operating levels over wide temperature ranges.
Each of the amplifier pallets is connectorized. All amplifier pallets must have the transistor drain
voltages reach at least 26Vdc before the RF drive is applied.