Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

1999-04-22

2000-12-19

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

327359, H03F 345

Patent

active

061632155

ABSTRACT:
In a variable gain amplifier controlling a gain by using differential amplifiers with a gain control signal, a gain switchover differential amplifier or a bias circuit which composes a current mirror with the gain switchover differential amplifier is connected between a high and a low gain differential amplifier for the same bias current which are mutually connected to share load resistances for the same output polarity and a bias current source common to both of the differential amplifiers, to perform switchover operations of the high and the low differential amplifier by a gain control signal, and a current source which flows a fixed offset current through at least the low one of the high and the low differential amplifier is provided.

REFERENCES:
patent: 4704738 (1987-11-01), Graziadei et al.
patent: 5896063 (1999-04-01), Marsh et al.
patent: 5949285 (1999-09-01), Ando
patent: 5999049 (1999-12-01), Katakura

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