1 电子学基础 第1单元测验

1、 问题:What is the input resistance between terminals B and G in the circuit shown below? (The voltage vx is a test voltage with the input resistance Rin defined as Rin ≡ vx / ix.)
选项:
A:
B:
C:
D:
答案: 【

2、 问题:A signal source has an open-circuit voltage of 10mV and a short-circuit current of 10μA. The source resistance is kΩ
答案: 【1

3、 问题:An amplifier has a voltage gain of 100 V/V and a current gain of 1000 A/A. The power gain in decibels is dB
答案: 【50

4、 问题:An amplifier operating from a single 15-V supply provides a 12-V peak-to-peak sine-wave signal to a 1-kΩ load and draws negligible input current from the signal source. The dc current drawn from the 15-V supply is 8 mA. The power dissipated in the amplifier is mW.
答案: 【102

5、 问题:The output voltage of a voltage amplifier has been found to decrease by 20% when a load resistance of 1 kΩ is connected. The value of the amplifier output resistance is Ω
答案: 【250

2 运算放大器 第2单元测验

1、 问题:The circuit shown in Fig. (a) can be used to implement a transresistance amplifier. Find the value of the input resistance , the transresistance , and the output resistance of the transresistance amplifier. If the signal source shown in Fig. (b) is connected to the input of the transresistance amplifier, find its output voltage.
选项:
A:
B:
C:
D:
答案: 【

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