FCC E6E - 电路元件与半导体

#E6E01🔗

Why is gallium arsenide (GaAs) useful for semiconductor devices operating at UHF and higher frequencies?

为什么砷化镓 (GaAs) 对于在 UHF 和更高频率下运行的半导体器件有用？

Higher noise figures

更高的噪声系数

Higher electron mobility

更高的电子迁移率

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Lower junction voltage drop

更低的结压降

Lower transconductance

更低的跨导

#E6E02🔗

Which of the following device packages is a through-hole type?

以下哪种器件封装是通孔型？

DIP

双列直插式

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PLCC

BGA

球栅阵列

SOT

索特

#E6E03🔗

Which of the following materials supports the highest frequency of operation when used in MMICs?

以下哪种材料在 MMIC 中使用时支持最高工作频率？

Silicon

硅

Silicon nitride

氮化硅

Silicon dioxide

二氧化硅

Gallium nitride

氮化镓

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#E6E04🔗

Which is the most common input and output impedance of MMICs?

MMIC 最常见的输入和输出阻抗是什么？

50 ohms

50欧姆

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300 ohms

300欧姆

450 ohms

450欧姆

75 ohms

75欧姆

#E6E05🔗

Which of the following noise figure values is typical of a low-noise UHF preamplifier?

以下哪个噪声系数值是低噪声 UHF 前置放大器的典型噪声值？

0 . 5 dB

0 . 5分贝

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-10 dB

-10分贝

44 dBm

44分贝

-20 dBm

-20分贝

#E6E06🔗

What characteristics of MMICs make them a popular choice for VHF through microwave circuits?

MMIC 的哪些特性使其成为 VHF 通过微波电路的热门选择？

The ability to retrieve information from a single signal, even in the presence of other strong signals

即使存在其他强信号，也能够从单个信号中检索信息

Extremely high Q factor and high stability over a wide temperature range

在宽温度范围内具有极高的品质因数和高稳定性

Nearly infinite gain, very high input impedance, and very low output impedance

接近无限的增益、非常高的输入阻抗和非常低的输出阻抗

Controlled gain, low noise figure , and constant input and output impedance over the specified frequency range

受控增益、低噪声系数以及在指定频率范围内恒定的输入和输出阻抗

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#E6E07🔗

What type of transmission line is often used for connections to MMICs?

哪种类型的传输线通常用于连接 MMIC？

Miniature coax

微型同轴电缆

Circular waveguide

圆形波导

Parallel wire

平行线

Microstrip

微带线

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#E6E08🔗

How is power supplied to the most common type of MMIC?

最常见类型的 MMIC 是如何供电的？

Through a capacitor and RF choke connected to the amplifier input lead

通过电容器和射频扼流圈连接到放大器输入引线

MMICs require no operating bias

MMIC 不需要操作偏差

Through a resistor and/or RF choke connected to the amplifier output lead

通过连接到放大器输出引线的电阻器和/或射频扼流圈

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Directly to the bias voltage (Vcc) lead

直接连接至偏置电压 (Vcc) 引线

#E6E09🔗

Which of the following component package types have the least parasitic effects at frequencies above the HF range?

以下哪种元件封装类型在高于 HF 范围的频率下寄生效应最小？

TO-220

Axial lead

轴向导程

Radial lead

径向导程

Surface mount

表面贴装

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#E6E10🔗

What advantage does surface-mount technology offer at RF compared to using through-hole components?

与使用通孔元件相比，表面贴装技术在射频领域具有哪些优势？

Smaller circuit area

电路面积更小

Shorter circuit board traces

更短的电路板走线

Components have less parasitic inductance and capacitance

元件寄生电感和电容较小

All these choices are correct

所有这些选项都是正确的

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#E6E11🔗

What is a characteristic of DIP packaging used for integrated circuits?

集成电路用DIP封装有什么特点？

Extremely low stray capacitance (dielectrically isolated package)

极低的杂散电容（介质隔离封装）

Extremely high resistance between pins (doubly insulated package)

引脚间极高的电阻（双重绝缘封装）

Two chips in each package (dual in package)

每个封装两个芯片（双封装）

Two rows of connecting pins on opposite sides of package (dual in-line package)

封装相对两侧有两排连接引脚（双列直插式封装）

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#E6E12🔗

Why are DIP through-hole package ICs not typically used at UHF and higher frequencies?

为什么 DIP 通孔封装 IC 通常不用于 UHF 和更高频率？

Excessive dielectric loss

介电损耗过大

Epoxy coating is conductive above 300 MHz

环氧树脂涂层在 300 MHz 以上具有导电性

Excessive lead length

引线长度过长

✓ 正确答案

Unsuitable for combining analog and digital signals

不适合组合模拟和数字信号

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FCC E6E - 电路元件与半导体

小节 E6E：电路元件与半导体