Method and apparatus for improving intermodulation in a feed-for

Details Method and apparatus for improving intermodulation in a feed-for Method and apparatus for improving intermodulation in a feed-for

1996-08-19

1999-02-02

Mottola, Steven

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330151, H03F 126

Patent

active

058670645

ABSTRACT:
A feed-forward amplifier (600) has an error path (123) replaced by a feed-forward amplifier (603) in a nested feed-forward configuration. By replacing the error path (123) with the feed-forward amplifier (603), design parameters such as efficiency and power output which are difficult to achieve with the conventional error path (123) are easily achieved with the single loop feed-forward amplifier (603). In this configuration, the main path (613) of the feed-forward amplifier (603) is capable of operating in a more efficient Class AB mode while still operating over a large dynamic range with to provide a relatively constant gain/phase relationship, thus insuring good intermodulation performance. The error path (627) of the feed-forward amplifier (603) must still be biased Class A, but it's requirements are much less than those of a Class A error amplifier (124) in an un-nested configuration.

REFERENCES:
patent: 5304945 (1994-04-01), Myer
patent: 5386198 (1995-01-01), Ripstrand et al.

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