Partitioning the final amplifier
in this way greatly eases maintenance in the final system.
The designer can select a discrete, three-stage PA configuration with the MRF7P20040H as the final amplifier
, or the MD7IC2050N IC (which includes the driver and final amplifier
stages) in a two-stage PA configuration.
Higher order harmonics could be filtered in a bandpass section, but the on-chip filter is required only to filter out the first and second harmonics such that the third harmonic dominates the final amplifier
The new amplifiers' high linearity minimizes additional signal distortion for repeater applications when used in final amplifier
stages, and reduces backoff power requirements to minimize distortion from high PAR (peak to average ratio) signals in 3G/4G mobile base stations.
The IPA is transparent to most final amplifier
parameters and is temperature compensated to minimize drift.
When employed in a final amplifier
application at 28 V, it is designed to deliver a gain of 28 dB, ALT1 of -47 dBc and ALT2 of -49 dBc (6-carrier TD-SCDMA signal) from 2010 MHz to 2025 MHz at an output power of 35 dBm.
The output of the final amplifier
in the gain chain constitutes an amplitude-limited version of the input signal.
Communication satellites use traveling wave tube (TWT) amplifiers as the final amplifier
to transmit very low level radio frequency signals back to Earth for a variety of applications including voice, TV and data.
Therefore, built-in matching networks can determine the operating mode of the final amplifier
, limiting output power and, especially, collector efficiency.
The extensive product line features high-power UHF transmitters using the inductive output tube ("IOT") final amplifier
, medium power transmitters in both solid-state and tube versions, and complete UHF and VHF exciter retrofits.
In high power microwave transmitters and final amplifier
sections, where radiation leakage is potentially high, extremely high voltages and sometimes X-ray emissions are present.
The extensive product line features high power UHF transmitters using the IOT final amplifier
, low and medium power transmitters in both solid-state and tube versions, and complete UHF and VHF exciter retrofits.