FCC E7G - 实用射频电路与滤波器

#E7G01🔗

What is the typical output impedance of an op-amp?

运算放大器的典型输出阻抗是多少？

Very low

很低

✓ 正确答案

Very high

非常高

100 ohms

100欧姆

10,000 ohms

10,000 欧姆

#E7G02🔗

What is the frequency response of the circuit in E7-3 if a capacitor is added across the feedback resistor?

如果在反馈电阻两端添加一个电容器，E7-3 中电路的频率响应是多少？

High-pass filter

高通滤波器

Low -pass filter

低通滤波器

✓ 正确答案

Band-pass filter

带通滤波器

Notch filter

陷波滤波器

#E7G03🔗

What is the typical input impedance of an op-amp?

运算放大器的典型输入阻抗是多少？

100 ohms

100欧姆

10,000 ohms

10,000 欧姆

Very low

很低

Very high

非常高

✓ 正确答案

#E7G04🔗

What is meant by the term “op-amp input offset voltage”?

术语“运算放大器输入失调电压”是什么意思？

The output voltage of the op-amp minus its input voltage

运算放大器的输出电压减去其输入电压

The difference between the output voltage of the op-amp and the input voltage required in the immediately following stage

运算放大器的输出电压与后级所需的输入电压之间的差值

The differential input voltage needed to bring the open loop output voltage to zero

使开环输出电压为零所需的差分输入电压

✓ 正确答案

The potential between the amplifier input terminals of the op-amp in an open loop condition

开环条件下运算放大器的放大器输入端子之间的电势

#E7G05🔗

How can unwanted ringing and audio instability be prevented in an op-amp audio filter?

如何在运算放大器音频滤波器中防止不必要的振铃和音频不稳定？

Restrict both gain and Q

限制增益和 Q

✓ 正确答案

Restrict gain but increase Q

限制增益但增加 Q

Restrict Q but increase gain

限制 Q 但增加增益

Increase both gain and Q

增加增益和 Q

#E7G06🔗

What is the gain-bandwidth of an operational amplifier?

什么是运算放大器的增益带宽？

The maximum frequency for a filter circuit using that type of amplifier

使用该类型放大器的滤波器电路的最大频率

The frequency at which the open - loop gain of the amplifier equals one

放大器开环增益等于1时的频率

✓ 正确答案

The gain of the amplifier at a filter’s cutoff frequency

滤波器截止频率处放大器的增益

The frequency at which the amplifier’s offset voltage is zero

放大器失调电压为零的频率

#E7G07🔗

What voltage gain can be expected from the circuit in Figure E7-3 when R1 is 10 ohms and RF is 470 ohms?

当 R1 为 10 欧姆且 RF 为 470 欧姆时，图 E7-3 中的电路的预期电压增益是多少？

0.21

4700

✓ 正确答案

#E7G08🔗

How does the gain of an ideal operational amplifier vary with frequency?

理想运算放大器的增益如何随频率变化？

It increases linearly with increasing frequency

随着频率的增加线性增加

It decreases linearly with increasing frequency

随着频率的增加线性减少

It decreases logarithmically with increasing frequency

随着频率的增加呈对数减少

It does not vary with frequency

不随频率变化

✓ 正确答案

#E7G09🔗

What will be the output voltage of the circuit shown in Figure E7-3 if R1 is 1,000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?

如果 R1 为 1,000 欧姆，RF 为 10,000 欧姆，并且向输入施加 0.23 伏直流电压，图 E7-3 所示电路的输出电压是多少？

0.23 volts

0.23伏

2.3 volts

2.3伏

-0.23 volts

-0.23伏

-2.3 volts

-2.3伏

✓ 正确答案

#E7G10🔗

What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 1,800 ohms and RF is 68 kilohms?

当 R1 为 1,800 欧姆且 RF 为 68 kΩ 时，图 E7-3 中电路的绝对电压增益是多少？

0.03

✓ 正确答案

#E7G11🔗

What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 3,300 ohms and RF is 47 kilohms?

当 R1 为 3,300 欧姆且 RF 为 47 kΩ 时，图 E7-3 中的电路预计的绝对电压增益是多少？

✓ 正确答案

0.07

#E7G12🔗

What is an operational amplifier?

什么是运算放大器？

A high - gain , direct - coupled differential amplifier with very high input impedance and very low output impedance

具有极高输入阻抗和极低输出阻抗的高增益、直接耦合差分放大器

✓ 正确答案

A digital audio amplifier whose characteristics are determined by components external to the amplifier

数字音频放大器，其特性由放大器外部元件决定

An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit

用于将调频业余信号的平均输出提高到法定限制的放大器

A RF amplifier used in the UHF and microwave regions

用于 UHF 和微波区域的 RF 放大器

← 上一节: E7F 📑 返回 E7 大纲下一节: E7H →

FCC E7G - 实用射频电路与滤波器

小节 E7G：实用射频电路与滤波器