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Semiconductor device

專利號(hào)
US11888446B2
公開日期
2024-01-30
申請(qǐng)人
SEMICONDUCTOR ENERGY LABORATORY CO., LTD.（JP Atsugi）
發(fā)明人
Kiyotaka Kimura; Takeya Hirose; Hidetomo Kobayashi; Takayuki Ikeda
IPC分類
H03D7/14; H03D7/12; H01L27/12; H01L29/786; H10B12/00
技術(shù)領(lǐng)域
insulator,conductor,transistor,oxide,circuit,in,analog,530b,or,530c
地域： Atsugi

摘要

A semiconductor device with a novel structure is provided. The semiconductor device includes a mixer circuit including a digital-analog converter circuit, a control circuit for controlling the digital-analog converter circuit, a power source control switch, and a plurality of Gilbert circuits. The plurality of Gilbert circuits each include an analog potential holding circuit for holding an analog potential output from the digital-analog converter circuit. The control circuit has a function of outputting a signal for controlling the analog potential holding circuit and the digital-analog converter circuit. The power source control switch has a function of stopping supply of a power source voltage to the control circuit in a period during which the analog potential held in the analog potential holding circuit is not updated. The analog potential holding circuit includes a first transistor. The first transistor includes a semiconductor layer including an oxide semiconductor in a channel formation region.

說明書

In FIG. 1, the amplifier circuits 12_1 and 12_2, the mixer circuit 13, the analog-digital converter circuit 14, the digital effector 15, the digital interface 16, the digital-analog converter circuit 18, the mixer circuit 19, and the amplifier circuits 20_1 and 20_2 are shown as an audio codec 10. The audio codec 10 includes the mixer circuit 19 serving as a semiconductor device.

Although the two microphones 11_1 and 11_2 are shown in FIG. 1 as an example, three or more microphones may be provided. The number of the amplifier circuits 12_1 and 12_2 can be determined in accordance with the number of the microphones 11_1 and 11_2.

The mixer circuit 13 is a circuit for synthesizing analog audio data output from the microphones 11_1 and 11_2 through the amplifier circuits 121 and 12_2. The analog-digital converter circuit 14 is a circuit for converting the synthesized analog audio data into digital audio data.

The digital effector 15 is a circuit for processing the digital audio data output from the analog-digital converter circuit 14 in accordance with the control set by the external control circuit 17 through the digital interface 16.

權(quán)利要求

1
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