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Semiconductor device

專利號(hào)
US11888446B2
公開(kāi)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(shuō)明書

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National Phase Application under 35 U.S.C. § 371 of International Application PCT/IB2020/053904, filed on Apr. 27, 2020, which is incorporated by reference and claims the benefit of a foreign priority application filed in Japan on May 8, 2019, as Application No. 2019-087999.

TECHNICAL FIELD

One embodiment of the present invention relates to a semiconductor device.

In this specification and the like, a semiconductor device generally means a device that can function by utilizing semiconductor characteristics. It can be sometimes said that a display device (a liquid crystal display device, a light-emitting display device, and the like), a projection device, a lighting device, an electro-optical device, a power storage device, a memory device, a semiconductor circuit, an imaging device, a sensor device, and the like include a semiconductor device.

BACKGROUND ART

An audio codec is used for encoding analog audio data into digital data and decoding digital audio data into analog data in various applications. A mixer circuit in the audio codec has a function of amplifying and adding audio signals input from a plurality of channels and includes a circuit for controlling its gain (amplification factor).

A multiplier (also referred to as a multiplier circuit) for multiplying a first signal and a second signal is utilized in a mixer circuit for mixing signals. For example, Patent Document 1 discloses a Gilbert circuit (also referred to as a Gilbert cell) for performing mixing.

REFERENCE Patent Document

權(quán)利要求

1
The invention claimed is:1. A semiconductor device comprising:a digital-analog converter circuit;a control circuit;a power source control switch;an analog potential holding circuit including a first transistor; anda plurality of Gilbert circuits,wherein the analog potential holding circuit is configured to hold an analog potential output from the digital-analog converter circuit,wherein the control circuit is configured to control the analog potential holding circuit and the digital-analog converter circuit,wherein the power source control switch is configured to stop 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, andwherein the first transistor includes a semiconductor layer including an oxide semiconductor in a channel formation region.2. The semiconductor device according to claim 1,wherein the plurality of Gilbert circuits each include a second transistor, andwherein the second transistor includes a semiconductor layer including silicon in a channel formation region.3. The semiconductor device according to claim 2,wherein the first transistor is stacked over a layer including the second transistor.4. The semiconductor device according to claim 1, further comprising an adder circuit and an amplifier circuit,wherein the adder circuit is configured to add signals output from the plurality of Gilbert circuits, andwherein the amplifier circuit is configured to amplify signals output from the adder circuit.5. The semiconductor device according to claim 1,wherein the digital-analog converter circuit, the control circuit, the power source control switch, the analog potential holding circuit, and the plurality of Gilbert circuits are included in a mixer circuit.6. A semiconductor device comprising:a digital-analog converter circuit;an analog potential holding circuit including a first transistor; anda Gilbert circuit including a second transistor,wherein the analog potential holding circuit is configured to hold an analog potential output from the digital-analog converter circuit,wherein the first transistor includes a semiconductor layer including an oxide semiconductor in a channel formation region, andwherein one of a source and a drain of the first transistor is electrically connected to a gate of the second transistor.7. The semiconductor device according to claim 6,wherein the second transistor includes a semiconductor layer including silicon in a channel formation region.8. The semiconductor device according to claim 6,wherein the first transistor is stacked over a layer including the second transistor.9. The semiconductor device according to claim 6,wherein the digital-analog converter circuit, the analog potential holding circuit, and the Gilbert circuit are included in a mixer circuit.
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