Electronic amplification systems

Details Electronic amplification systems Electronic amplification systems

1980-07-23

1982-11-16

Mullins, James B.

Amplifiers

With amplifier bypass means

330149, 330 54, H03F 132, H03F 368

Patent

active

043596959

ABSTRACT:
For many applications it is desirable that electronic amplifiers have good linearity (a typical such application is in the field of high frequency radio transmission). Various arrangements and designs have been employed to ensure that the desired linearity is attained, but some types of amplifier have proven rather difficult in this respect: such a type is the distributed amplifier, where the correction of amplification errors has proven particularly difficult because of the relatively large time delay (and thus signal phase difference) "across" the amplifier. The present invention seeks to provide a distributed amplifier system allowing the easier correction of amplifier errors. Specifically, the invention provides an electronic amplification system incorporating a distributed amplifier, which system comprises comparison means (12,13) for comparing the shape of the input control signal with the shape of the final output signal, and for providing a difference signal indicative of any amplifier-induced distortion, correction signal generating means (V.sub.9) for forming in dependance upon the difference signal a correction signal, and combiner means (14) for combining the correction signal with the final output signal so as substantially to cancel the amplifier-induced distortion.

REFERENCES:
patent: 4258328 (1981-03-01), Prevot et al.
Bennett et al. Feedforward--An Alternative Approach to Amplifier Linearization, May 1974, Radio & Electronic Engineering, vol. 44, No. 5, pp. 257-262.

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