Kabushiki Kaisha Toshiba

Toshiba Electronic Devices & Storage Corporation

Shinji Ohno

Toshifumi Ishimori

Mitsuru Sugawara

A variable gain amplifier according to an embodiment comprises a first path, a matching circuit, an amplifier circuit, a second path, and a third path. The first path includes an attenuation circuit, has one end connected to a first input terminal, and attenuates an input signal and outputs an attenuated signal. The matching circuit has one end connected to the other end of the first path. The amplifier circuit has an input connected to the other end of the matching circuit and an output connected to a first output terminal, and amplifies an input signal. The second path is connected in parallel to the first path. The third path has one end connected to the first input terminal, and the other end connected to the first output terminal.

Variable gain amplifier and wireless communication device

According to one embodiment, a first switch controls conduction between first and second nodes according to a potential on a first control node. A second switch controls conduction between the first control node and a first potential node according to a potential on a second control node. A first circuit includes first and second output nodes respectively coupled to the first and second control nodes, and outputs at the second output node a potential that brings the second switch out of conduction while outputting a first potential at the first output node. The first circuit has a high impedance at the first output node while outputting at the second output node a potential that brings the second switch into conduction.

Growing community of inventors

Kawasaki Kanagawa, Japan

Shinji Ohno