Variable gain amplifier and a large scale integrated circuit...

Details Variable gain amplifier and a large scale integrated circuit... Variable gain amplifier and a large scale integrated circuit...

2006-07-11

2006-07-11

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C398S202000, C455S078000, C455S088000, C455S245100, C455S069000, C455S118000, C369S112110

Reexamination Certificate

active

07075369

ABSTRACT:
Variable gain amplifier and a LSI including the variable gain amplifier that expands an output voltage range or control voltage range without increasing power consumption. The variable gain amplifier includes a voltage-current conversion circuit; a variable gain unit; and a voltage output unit. The voltage-current conversion circuit outputs a first positive current and a first negative current in proportion to an input voltage. The variable gain unit inputting the first positive current and the first negative current controlled by a control signal and outputs four output currents including a second positive current, a third positive current, a second negative current and a third negative current. The voltage output unit inputs either the second positive current and the second negative current or the third positive current and the third negative current Iop3, and outputs a positive output voltage and a negative output voltage.

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