Sony Corporation

Sony Semiconductor Solutions Corporation

Tatsuya Shirakawa

Yoshinori Tanaka

Takanori Saeki

Masayuki Katakura

Norio Shoji

A semiconductor circuit apparatus of the present disclosure includes a control circuit controlling a clock signal externally input, a drive circuit performing a switching operation according to a pulse signal provided by the control circuit, a series connection circuit including an inductor element, a switch element, and a capacitive element connected in series between a signal line and a fixed potential node, the series connection circuit forming an LC resonance circuit, and a level detection circuit having an input end connected to the signal line. An output from the level detection circuit is fed back to the control circuit.

Semiconductor circuit apparatus and system equipped with semiconductor circuit apparatus

The present invention relates to a variable gain circuit including: a first transistor and a second transistor each having a control electrode connected to a circuit input terminal; a load connected between a first power supply and a first electrode of at least one of the first transistor and the second transistor; a third transistor and a fourth transistor having second electrodes connected to the first transistor and the second transistor, respectively, and each having a first electrode and a control electrode connected to each other; a first variable current source connected between a second power supply and the second electrodes of the first transistor and the third transistor and having a current value variable according to an external control signal; a second variable current source connected between the second power supply and the second electrodes of the second transistor and the fourth transistor and having a current value variable according to the control signal; a current source connected between the first power supply and a node of the first electrodes and the control electrodes of the third transistor and the fourth transistor; and an impedance component having one end connected to the first electrodes and the control electrodes of the third transistor and the fourth transistor.

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Tokyo, Japan

Tatsuya Shirakawa