Feed forward amplifier

Details Feed forward amplifier Feed forward amplifier

1997-06-30

1999-02-23

Mullins, James B.

Amplifiers

With amplifier bypass means

330149, 455 63, H03F 132

Patent

active

058748563

ABSTRACT:
A feed forward amplifier (200) comprises a main signal path (201), an error signal path (203), and a third signal path (205). In the preferred embodiment of the present invention, the third signal path (205) comprises a gain and phase adjuster (245), delay circuitry (249), summing circuitry (251), and an error cancellation detector (255). The third signal path (205) is designed to match passive components in a component section (207) of the main signal path (201) to the error signal path (203). Gain and phase adjustments are made by the gain and phase adjuster (235) to minimize the RSSI of the error components within the input signal (253). Because passive components in the third signal path (205) are matched to those of the component assembly (207) in the main signal path (201), the minimization of RSSI of the error components within the input signal (253) results in a properly phase and gain adjusted error signal (243) for maximum error cancellation, without utilizing a pilot-tone generator utilized within prior art error cancellation techniques.

REFERENCES:
patent: 4389618 (1983-06-01), Bauman

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