Feed-forward amplifier

Details Feed-forward amplifier Feed-forward amplifier

1998-04-01

2000-01-04

Lee, Benny

Amplifiers

With amplifier bypass means

330149, H03F 100

Patent

active

060114347

ABSTRACT:
The present invention provides a feed-forward amplifier having a predistortion circuit to provide a sufficient compensation for a variation in temperature. When a predistortion circuit 3 is used to minimize distortion in a main amplifier 6, the circuit 3, a variable attenuator 4, a variable phase shifter 5, and a main amplifier 6 are located in this order and a control circuit 19 controls the variable attenuator 4 and variable phase shifter 5 so that a carrier component, that is, an input signal, in a detected distortion component decreases to a minimum. In this manner, when the gain of the main amplifier 6 varies due to a variation in temperature, the preceding variable attenuator 4 and variable phase shifter 5 compensate for the variation of the gain. The input level of the predistortion circuit 3, however, is not affected, so the relationship between the output levels of the predistortion circuit 3 and main amplifier 6 remain unchanged compared to the amount prior to the temperature variation, thereby providing the same compensation effect.

REFERENCES:
patent: 5455537 (1995-10-01), Larkin et al.
patent: 5493252 (1996-02-01), Takai
patent: 5515000 (1996-05-01), Maruyama et al.
patent: 5610554 (1997-03-01), Anvari
patent: 5775018 (1998-06-01), Gianfortune et al.
patent: 5847603 (1998-12-01), Myer

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