BLF278 DATASHEET PDF

Supersedes data of October Philips Semiconductors. Dual push-pull silicon N-channel enhancement mode. SOTA1 balanced flange package with two ceramic. The mounting flange provides the common source.

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The data sheet contains a plot of drain current as a function of gate-source voltage, albeit at only one Vds, 10V. Above is a recreation of the BLF characteristics from 9 digitised points from the data sheet graph. The RF Power Amplifier Tube Performance Computer is a tool for modeling the operation of a RF power amplifier, given the transfer characteristic of the active device under a given load line. The table above shows the key model inputs and calculated values for W output from a pair of dies.

This model allows exploration of power output vs drive level, albeit within the assumption that the drain transfer characteristics are relatively constant as discussed above.

Above is a plot of output power compression relative to W from a pair of dies for various drive levels. A commonly used indicator of maximum power output in linear operation is the point where gain is compressed by 1dB, which in this model is around W, and gain compression is 2dB at W out. Adjusting the output circuit and drive for such an amplifier to achieve power in excess of about W reduces linearity, increases distortion products, reduces efficiency, and requires higher power supply current.

Note that if the amplifier output circuit was adjusted for say W maximum output, operation at W would require higher power supply current, be at reduced efficiency, and degraded linearity since the transistors operate at higher peak current to deliver the W into a reduced load impedance.

The datasheet also shows operating conditions for class AB. Class AB is shown with quiescent current of 0. The model above uses quiescent current of 0. All rights reserved. BLF drain characteristics. Modelled gain compression.

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Philips BLF278 Datasheet

The data sheet contains a plot of drain current as a function of gate-source voltage, albeit at only one Vds, 10V. Above is a recreation of the BLF characteristics from 9 digitised points from the data sheet graph. The RF Power Amplifier Tube Performance Computer is a tool for modeling the operation of a RF power amplifier, given the transfer characteristic of the active device under a given load line. The table above shows the key model inputs and calculated values for W output from a pair of dies. This model allows exploration of power output vs drive level, albeit within the assumption that the drain transfer characteristics are relatively constant as discussed above. Above is a plot of output power compression relative to W from a pair of dies for various drive levels. A commonly used indicator of maximum power output in linear operation is the point where gain is compressed by 1dB, which in this model is around W, and gain compression is 2dB at W out.

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Power rating of the BLF278 in class AB

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BLF278 Datasheet PDF

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Philips BLF278 Datasheet

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