FCC E7C - 实用射频电路与滤波器

#E7C01🔗

How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network’s input and output?

低通滤波器 Pi 网络的电容器和电感器如何布置在网络的输入和输出之间？

Two inductors are in series between the input and output, and a capacitor is connected between the two inductors and ground

输入和输出之间串联两个电感，两个电感和地之间连接一个电容

Two capacitors are in series between the input and output, and an inductor is connected between the two capacitors and ground

输入和输出之间串联两个电容，两个电容和地之间连接一个电感

An inductor is connected between the input and ground, another inductor is connected between the output and ground, and a capacitor is connected between the input and output

输入与地之间连接一个电感，输出与地之间连接一个电感，输入与输出之间连接一个电容

A capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between the input and output

输入与地之间连接一个电容，输出与地之间连接一个电容，输入与输出之间连接一个电感

✓ 正确答案

#E7C02🔗

What is the frequency response of a T-network with series capacitors and a shunt inductor?

具有串联电容器和并联电感器的 T 网络的频率响应是多少？

Low-pass

低通

High -pass

高通

✓ 正确答案

Band-pass

带通

Notch

缺口

#E7C03🔗

What is the purpose of adding an inductor to a Pi-network to create a Pi-L-network?

在 Pi 网络中添加电感器以创建 Pi-L 网络的目的是什么？

Greater harmonic suppression

更强的谐波抑制能力

✓ 正确答案

Higher efficiency

效率更高

To eliminate one capacitor

消除一个电容器

Greater transformation range

更大的变换范围

#E7C04🔗

How does an impedance-matching circuit transform a complex impedance to a resistive impedance?

阻抗匹配电路如何将复阻抗转换为电阻阻抗？

It introduces negative resistance to cancel the resistive part of impedance

引入负电阻来抵消阻抗的阻性部分

It introduces transconductance to cancel the reactive part of impedance

引入跨导来抵消阻抗的电抗部分

It cancels the reactive part of the impedance and changes the resistive part to the desired value

它消除了阻抗的电抗部分，并将电阻部分更改为所需值

✓ 正确答案

Reactive currents are dissipated in matched resistances

无功电流消耗在匹配电阻中

#E7C05🔗

Which filter type has ripple in the passband and a sharp cutoff?

哪种滤波器类型在通带中有纹波并且截止很陡？

A Butterworth filter

巴特沃斯滤波器

An active LC filter

有源 LC 滤波器

A passive op-amp filter

无源运算放大器滤波器

A Chebyshev filter

切比雪夫滤波器

✓ 正确答案

#E7C06🔗

What are the characteristics of an elliptic filter?

椭圆滤波器有什么特点？

Gradual passband rolloff with minimal stop-band ripple

具有最小阻带纹波的逐渐通带滚降

Extremely flat response over its pass band with gradually rounded stop-band corners

通带上的响应极其平坦，阻带角逐渐变圆

Extremely sharp cutoff with one or more notches in the stop band

阻带中具有一个或多个凹口的极其锐利的截止

✓ 正确答案

Gradual passband rolloff with extreme stop-band ripple

具有极端阻带纹波的逐渐通带滚降

#E7C07🔗

Which describes a Pi-L network?

哪个描述了 Pi-L 网络？

A Phase Inverter Load network

A 逆变器负载网络

A Pi-network with an additional output series inductor

具有附加输出串联电感器的 Pi 网络

✓ 正确答案

A network with only three discrete parts

仅包含三个离散部分的网络

A matching network in which all components are isolated from ground

所有元件均与地隔离的匹配网络

#E7C08🔗

Which of the following is most frequently used as a band-pass or notch filter in VHF and UHF transceivers?

以下哪项最常用作 VHF 和 UHF 收发器中的带通或陷波滤波器？

A Sallen-Key filter

Sallen-Key 过滤器

A helical filter

螺旋过滤器

✓ 正确答案

A swinging choke filter

摆动扼流圈滤波器

A finite impulse response filter

有限脉冲响应滤波器

#E7C09🔗

What is a crystal lattice filter?

什么是晶格滤波器？

A power supply filter made with interlaced quartz crystals

由交错石英晶体制成的电源滤波器

An audio filter made with four quartz crystals that resonate at 1 kHz intervals

由四个以 1 kHz 间隔谐振的石英晶体制成的音频滤波器

A filter using lattice-shaped quartz crystals for high-Q performance

使用晶格状石英晶体实现高 Q 性能的滤波器

A filter for low - level signals made using quartz crystals

使用石英晶体制成的低电平信号滤波器

✓ 正确答案

#E7C10🔗

Which of the following filters is used in a 2-meter band repeater duplexer?

2 米带中继双工器中使用以下哪种滤波器？

A crystal filter

水晶过滤器

A cavity filter

空腔过滤器

✓ 正确答案

A DSP filter

DSP 滤波器

An L-C filter

L-C 滤波器

#E7C11🔗

Which of the following measures a filter’s ability to reject signals in adjacent channels?

以下哪项衡量滤波器抑制相邻通道信号的能力？

Passband ripple

通带纹波

Phase response

相位响应

Shape factor

形状系数

✓ 正确答案

Noise factor

噪声系数

← 上一节: E7B 📑 返回 E7 大纲下一节: E7D →

FCC E7C - 实用射频电路与滤波器

小节 E7C：实用射频电路与滤波器